Idaho Idaho Fiduciary Income Tax

Idaho Fiduciary Income Tax
Form 66, Fiduciary Income Tax Return and Instructions 2023
Don’t Staple

Amended Return? Check the box.
See page 1 of instructions for reasons to
amend, and enter the number that applies.

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For calendar year
2023 or fiscal
year beginning

2023

Mo

Day

Year

23

State use only

Name of estate or trust

Name and title of fiduciary
City

8734

Form 66
Fiduciary Income Tax Return
Mo

Day

Year

State use only

ending
Federal Employer Identification Number (EIN)

Current mailing address of fiduciary (number and street)
State

ZIP Code

Foreign country (if not U.S.)

Check all that apply: ▪
Resident Return ▪
Part-Year Resident Return ▪
Nonresident Return ▪
Composite Return
Qualified Disability Trust (QDT)
▪ Grantor Trust ▪ Electing Small Business Trust ▪ Qualified Funeral Trust (QFT) ▪

Don’t Staple

1. If reporting for an estate:
a. Decedent’s Social Security number
b. Decedent’s date of death
c. Was the decedent a resident of Idaho? ................................................................................................
d. If no, enter the state of residence
2. Does this estate or trust have any nonresident beneficiaries? ....................................................................
3. Is this a final return? ....................................................................................................................................
4.
5.
6.
7.
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29.

Idaho adjusted income. Enter the amount from Schedule A, page 2, line 19 ...............................
Income distribution deduction to beneficiaries ..............................................................................
Estate tax deduction ......................................................................................................................
Subtract lines 5 and 6 from line 4 ..................................................................................................
Qualified business income deduction ............................................................................................
Exemption. See instructions ..........................................................................................................
Idaho taxable income. Subtract lines 8 and 9 from line 7 ..............................................................
Idaho income tax. Use the Tax Computation Schedule. See instructions .....................................
Donation to Opportunity Scholarship Program ..............................................................................
Credits. Enter the amount from Schedule B, page 2, line 6. See instructions ..............................
Add lines 11 and 12, then subtract line 13. If less than zero, enter zero........................................
Income distribution reportable by beneficiaries. See instructions..................................................
Tax on income distribution. Multiply line 15 by 5.8% ..... ▪
Less credits ▪
Permanent building fund tax. See instructions. Enter zero if this is a QFT ....................................
Total tax from recapture of income tax credits from Form 44, Part II, line 6. Include Form 44 ......
Fuels tax due. Include Form 75 .....................................................................................................
Sales/use tax due on untaxed purchases (online, mail order, and other) ..............................
Tax from recapture of qualified investment exemption. Include Form 49ER .................................
Tax on Electing Small Business Trust or QFT composite return. See instructions ........................
Total tax. Add lines 14 and 16 through 22 .....................................................................................
Estimated tax payments. If made under other EINs, provide EINs, amounts, and rollforwards ..........
Idaho income tax withheld. Include Forms W-2 or 1099 ...............................................................
Tax paid by affected business entity on your behalf ......................................................................
Special fuels tax refund
Gasoline tax refund
Include Form 75 .........
Tax reimbursement incentive credit. Include certificate ................................................................
Total payments and other credits. Add lines 24 through 28 ...........................................................

30.
31.
32.
33.
34.
35.

Tax due. If line 23 is more than line 29, subtract line 29 from line 23 .......................................... ▪
Penalty ▪
Interest from the due date ▪
Enter total .......................
Nonrefundable credit from a prior year return. See Form 44 instructions ...................................... ▪
Total Due. Add lines 30 and 31, then subtract line 32 ................................................................. ▪ 33
Overpayment. If line 23 is less than line 29, subtract line 23 from line 29 ........................................... ▪
Refund ......... ▪
Apply to 2024 ........... ▪

Refund or Payment Due

Continue to page 2.
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09-13-2023 

Page 1 of 2

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Yes ▪

No

Yes ▪
Yes ▪

No
No

Form 66

2023

(continued)

Schedule A - Computation of Idaho adjusted income
Idaho Amounts
1. Interest and dividend income.

Business ▪

2. Income or (loss).
3. Gain or (loss).

Interest ▪

Capital ▪

Dividends ▪

Enter total .....

1

Enter total ......................

2

Enter total .............................

3

Farm ▪
Ordinary ▪

▪ 4
▪ 5
6. Total income. Add lines 1 through 5 .................................................................................................... ▪ 6
4. Rents, royalties, partnerships, other estates and trusts, etc. ...................................................................
5. Other income. Include explanation ..........................................................................................................

Column B - Idaho

Column A - Federal


7. Column A – Total income from federal Form 1041, line 9
Column B – Total income from line 6 ............................................................ ▪

7

8. Interest and dividends not taxable under Internal Revenue Code ................ ▪

8

9. Addition for bonus depreciation. Include a schedule .................................... ▪

9

10. Other additions. Include a schedule ............................................................. ▪ 10
11. Idaho net operating loss. Carryover ▪

Carryback ▪

11

12. Income exempt from Idaho tax. Include a schedule ..................................... ▪ 12
13. Subtraction for bonus depreciation. Include a schedule ............................... ▪ 13
14. Other subtractions. Include a schedule ........................................................ ▪ 14
15. Add lines 7 through 10 and subtract lines 11 through 14 ............................. ▪ 15
16. Deductions from federal Form 1041, lines 10 through 15a. See instructions ....................................
17. Idaho percentage. Divide line 15, Column B by line 15, Column A .....................................................
18. Multiply line 16 by line 17 ....................................................................................................................
19. Idaho adjusted income. Subtract line 18 from line 15, Column B. Enter here and on page 1, line 4 ..

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16

%

17
18
19

Schedule B - Credits
1. Did you claim the qualified investment exemption for investment tax credit property acquired this tax year? .....

Yes ▪

No

2. Credit for income tax paid to other states - Nonresidents can’t claim this credit.
a. Idaho income tax, page 1, line 11 .............................................................

2a

Include a copy
of the income
tax return and a
separate Form 66,
% page 2 for each
state for which a
credit is claimed.

b. Total income from federal Form 1041, line 9 ............................................. 2b
c. Enter the portion of line b derived from sources in and taxed
by the other state ...................................................................................... ▪ 2c
2d
d. Divide line c by line b. Enter percentage here ..........................................
e. Multiply line a by line d ..............................................................................

2e

f. Other state’s tax due less its income tax credits ....................................... ▪ 2f
g. Credit for income tax paid to other states. Enter the smaller of line e or line f.
A copy of the other state’s return must accompany this return ...................................................... ▪ 2g
3. Credit for contributions to Idaho educational entities ...........................................................................

▪ 3

4. Credit for contributions to Idaho youth and rehabilitation facilities ....................................................... ▪ 4
5. Total business income tax credits from Form 44, Part I, line 10. Include Form 44 ..............................

5

6. Total credits. Add lines 2g through 5. Enter total here and on page 1, line 13 .....................................

6

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Within 180 days of receiving this return, the Idaho State Tax Commission may discuss this return with the paid preparer identified below.
Under penalties of perjury, I declare that to the best of my knowledge and belief this return is true, correct, and complete. See instructions.

Signature of fiduciary

Sign ▪

Here Date

Paid preparer’s signature

Phone number

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Address

Preparer’s EIN, SSN, or PTIN

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Phone number

Return and payment - Mail to: Idaho State Tax Commission, PO Box 83784 Boise ID 83707-3784
Return only - Mail to: Idaho State Tax Commission, PO Box 56, Boise, ID 83756-0056
Include a complete copy of your federal Form 1041.
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09-13-2023 

Page 2 of 2

Form 66 — Instructions
Fiduciary Income Tax Return
Instructions are for lines not fully explained on the form.
The trust or estate must provide each beneficiary
with an Idaho Form ID K-1. This form shows the
beneficiary’s share of Idaho additions, subtractions,
and credit information. Form ID K-1 also identifies the
beneficiary’s share of gross income to help determine
Idaho filing requirements of individual beneficiaries.
Include all Form ID K-1s and a complete copy of
federal Form 1041, including all federal Schedule
K-1s, with the Idaho Form 66.
If filing an ESBT return, include a complete copy of the
federal Form 1041 ESBT tax calculation worksheet
including all appropriate schedules and the Idaho
ESBT tax calculation worksheet.

Rounding
Round the amounts on the return to the nearest whole
dollar. Round down if under 50 cents, round up if 50
cents or more.

Heading
File the 2023 return for calendar year 2023 or a fiscal
year that begins in 2023. For a fiscal year, fill in the
fiscal year beginning and ending dates at the top of
the form.
Write your trust or estate name, fiduciary name and
title, address, and federal Employer Identification
Number (EIN) in the space provided. Don’t include the
dash.

Amended Returns
You can use this form as an original return or an
amended return.
If you’re filing this form as an amended return, check
the amended return box at the top of the form. Enter
the number from the following list that best describes
your reason for amending.
1.	 Federal Audit
2.	 Net Operating Loss Carryback – Include Form 56
or a schedule showing the application of the loss
3.	 Federal Amended
4.	 Other – Include an explanation
Complete the entire form using the corrected amounts.

Specific Instructions
Electing Small Business Trusts (ESBT)
Check the box if the trustee elected for the trust to be
an ESBT for federal purposes.
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2023

Qualified Funeral Trusts (QFT)
Check the box if the trustee made the election under
Internal Revenue Code (IRC) Section 685 and the
trust otherwise qualifies as a QFT. Check the box if
filing a QFT composite return. Don’t complete lines 4
through 16. Enter zero on line 17 and continue to
line 22.
Qualified Disability Trusts (QDT)
Check the box if the entity is a qualified disability trust.

Questions 1, 2, and 3
Mark the appropriate boxes and provide the requested
information. Answer each question or the return is
considered incomplete. Incomplete returns delay
processing.
Complete questions 1a through 1d if the fiduciary files
Form 66 for an estate. Otherwise, go to question 2.
Question 1 Estates.
a.	 Enter the decedent’s Social Security number.
b.	 Enter the decedent’s date of death.
c.	 If the decedent was an Idaho resident on the date of
death, check the “Yes” box.
d.	 If box c is checked “No,” enter the decedent’s state
of residence on the date of death.
Question 2 Resident/Nonresident Beneficiaries.
Check the “Yes” box if any beneficiary of the trust or
estate isn’t an Idaho resident. A beneficiary is an Idaho
resident if the individual:
•	 Is domiciled for the entire year in Idaho even though
temporarily outside of Idaho, and
•	 Has a home in Idaho for the entire year and spends
more than 270 days in Idaho during the tax year
A Form PTE-12 is required if you checked “Yes.” See
Form PTE-12 instructions.
Question 3 Final Return. Check the “Yes” box if this is
the final Idaho return for the trust or estate.
Line 5 Income Distribution Deduction
Enter the amount of the deduction for distributions to
beneficiaries. Include Form PTE-12 with the return if the
trust or estate files as a pass-through entity. Enter the
total of Idaho distributable income from Form PTE-12
column (b).
Line 6 Estate Tax Deduction
Enter the deduction for federal estate tax attributable
to income in respect of a decedent. If the income in
question has been distributed, only the fiduciary’s
proportionate share may be deducted. Refer to federal
Page 1 of 10

Form 66 — Instructions
Form 1041 instructions. If any or all of the estate tax
is attributed to income that’s exempt from Idaho tax,
you must make a special Idaho adjustment to add
back a proportionate share of the deduction. Include a
schedule showing the computation.
Line 8 Qualified Business Income Deduction
Resident Trust or Estate
Enter the amount from Form 1041, line 20.
Part-year Resident or Nonresident Trust or Estate
Enter the amount from line 4 of the following
worksheet:

2023 (continued)

Line 9 Exemption
Enter zero here if the trust or estate distributes all
its income to the beneficiaries, reports the income
distribution, and pays the tax for the beneficiaries.
Enter zero here if the trust is an exempt trust filing
a Form 990-T to report unrelated business taxable
income. The exemption for a qualified disability trust
(QDT) is the same as the exemption used for federal
purposes.
If all income is reported to Idaho, enter the federal
exemption from Form 1041, line 21.

Qualified Business Income Deduction Worksheet
1.

Enter the business information in the table below using information from the K-1s and federal Form 8995. Then add the totals for
Column (c) and for column (e).
(a)
Business name

(b)
Taxpayer
identification number

(e)
(d)
(c)
Idaho source qualified
Total qualified business Idaho apportionment
business income or (loss)
factor
income or (loss)
(Multiply Column c by
Column d)

Total:

2. Divide the total of Column (e) by the total of Column (c) for the Idaho percentage of qualified
business income...............................................................................................................................
3. Enter the qualified business income deduction claimed on the federal return ................................
4. Multiply line 2 by line 3 to calculate the Idaho qualified business income deduction.
Enter the amount from line 4 on Idaho Form 66, Line 8 ..................................................................

If only part of the income is reported to Idaho, enter
the amount from line 3 of the following computation:
1. Federal exemption, Form 1041,
line 21 ....................................................
2. Idaho percentage. Schedule A,
line 17 .....................................................
3. Exemption. Multiply line 1 by line 2 .......

%

Line 12 Donation to Opportunity Scholarship
Program
You can make a voluntary donation to the Idaho
Opportunity Scholarship Program. The amount
designated will either reduce your refund or increase
your tax due. Your choice to donate can’t be changed;
you can’t get a refund later.
Contributions help provide need-based scholarship
funds to Idaho high school graduates who
attend approved higher education institutions
in Idaho. For more information about the Idaho
Opportunity Scholarship Program, please visit
www.boardofed.idaho.gov/scholarship/opportunity.asp.
Line 13 Credits
Enter the amount from Form 66, Schedule B, line 6.
Instructions for Schedule B begin on page 8.
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09-13-2023 

Total:
2
3
4

Line 15 Income Distribution Reportable by
Beneficiaries
Determine the amounts from lines 4 and 5 reported by the
trust or estate on the fiduciary return. If the trust or estate
files as a pass-through entity and includes nonresident
beneficiary income in a composite return, this amount
should be the total Idaho distributable income for all
shareholders on Form PTE-12 with filing code “C”. Don’t
include amounts distributed to a beneficiary who doesn’t
meet the Idaho individual income tax filing requirement.
If the trust or estate pays the tax for one or more
nonresident individual beneficiaries, determine each
beneficiary’s share of the total business income tax
credits allowed from Form 44, Part I, line 10, and enter
the total of these amounts on the credits line of Form 66,
line 16. Don’t enter the total credit earned by the trust
or estate if the trust or estate isn’t paying the tax for all
beneficiaries. Include Form 44.
Line 16 Tax on Income Distribution
If the trust or estate pays the tax on a beneficiary’s
income distribution, this income is taxed at the corporate
rate of 5.8%. If a trust or estate files as a pass-through
entity and includes nonresident beneficiary income in a
composite return, this amount is the same as the total
on Form PTE-12 column (c). Any credits from the estate
Page 2 of 10

Form 66 — Instructions
or trust that flow through to the beneficiary can be used
to offset the tax attributable to that beneficiary. Include
a schedule showing this computation.
Line 17 Permanent Building Fund (PBF) Tax
A trust or estate that meets the Idaho filing
requirement and doesn’t distribute all of its Idaho
adjusted income must pay the $10 PBF tax. For
example, if the trust pays tax on capital gains, the $10
PBF tax is required.
If a trust or estate reports income on line 14 and
pays the tax on income paid to nonresident individual
beneficiaries, it’s required to pay the $10 PBF tax
for each beneficiary. A trust or estate must pay the
PBF tax for each nonresident individual beneficiary
included in the composite return.
If all the Idaho adjusted income is distributed to
beneficiaries who file Idaho income tax returns, the
trust or estate doesn’t owe this tax.
Enter zero if this is a QFT.

2023 (continued)

Line 20 Sales/Use Tax Due
If you purchased an item from an out-of-state seller
(including internet, catalog, radio, and TV purchases)
and the seller didn’t collect sales tax on that purchase,
you must pay the use tax directly to the Tax Commission.
Multiply the total amount of these purchases by 6% (.06).
If you computed use tax on Form 75, add it to the use
tax on other purchases and enter the total here.
If you have an Idaho sales or use tax account, don’t enter
your sales or use tax on this line, but continue to report
the tax on these purchases on your sales and use tax
returns.
Line 21 Tax From Recapture of Qualified Investment
Exemption (QIE)
If you’ve claimed the QIE for property tax on property
that no longer qualifies before the end of the five-year
recapture period, you must recapture part or all of the
property tax benefit. Enter the amount from Form 49ER,
Part III, line 18. Include Form 49ER.

Line 18 Total Tax From Recapture of Income Tax
Credits
If the trust or estate pays the tax for one or more
beneficiaries, include on this line those beneficiaries’
share of the total tax from recapture of income tax
credits from Form 44, Part II, line 6. Include Form 44.

Line 22 Tax on ESBT or QFT Composite Return
Don’t include ESBT and QFT items on Schedule A.

Line 19 Fuels Tax Due
If you buy gasoline, aircraft fuel, or special fuels
(diesel, propane, or natural gas) without paying the
fuels tax and later use this fuel in licensed vehicles
or aircraft, you owe fuels tax. Add the amounts on
Form 75, Section IV, lines 3 and 4, and enter the total
here. Include Form 75.

Use the ESBT Tax Worksheet below to figure the Idaho
ESBT tax.

ESBTs: If the trust is an ESBT, the portion that consists
of stock in one or more S corporations is treated as a
separate trust, and you must compute the tax separately
on that separate trust.

Don’t claim an income distribution deduction, an
exemption amount, or a deduction for capital losses in
excess of capital gains.

Electing Small Business Trust (ESBT) Tax Worksheet
1.
2.
3.
4.
5.
6.

7.
8.
9.
10.
11.
12.
13.
14.
15.

Interest and dividend income. Interest
Dividends
Enter total .........
Income or (loss).
Business
Farm
Enter total ...........................
Gain or (loss). Capital
Ordinary
Enter total ...................................
Rents, royalties, partnerships, other estates and trusts, etc. ........................................................................
Other income. Include explanation ................................................................................................................
Total income. Add lines 1 through 5 .........................................................................................................
Column A - Federal
Column A – Total income from federal Form 1041, line 9
Column B – Total income from line 6 ....................................................................... 7
Interest and dividends not taxable under Internal Revenue Code .......................... 8
Bonus depreciation addition. Include a schedule .................................................... 9
Other additions. Include a schedule ........................................................................ 10
Idaho net operating loss. Carryover
Carryback
....... 11
Income exempt from Idaho tax. Include a schedule ................................................ 12
Bonus depreciation subtraction. Include a schedule ............................................... 13
Other subtractions. Include a schedule ................................................................... 14
Qualified business income deduction. See instructions .......................................... 15

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Idaho Amounts
1
2
3
4
5
6
Column B - Idaho

Page 3 of 10

Form 66 — Instructions

2023 (continued)

Column A - Federal Column B - Idaho
16. Add lines 7 through 10, and subtract lines 11 through 15 ....................................... 16
%
17. Idaho percentage. Divide line 16, Column B by line 16, Column A .......................................................... 17
Deductions
18. Interest .................................................................................................................... 18
19. Fiduciary fees .......................................................................................................... 19
20. Charitable contribution deduction ............................................................................ 20
21. Attorney, accountant, return preparation fees ......................................................... 21
22. Other deductions not subject to 2% limit ................................................................. 22
23. Total deductions. Add lines 18 through 22 ................................................................................................
24. Multiply line 17 by line 23 ..........................................................................................................................
25. Idaho taxable income. Subtract line 24 from line 16, Column B ...............................................................
26. Idaho ESBT tax. Multiply line 25 by 5.8% .................................................................................................
27. Credit for income tax paid to other states .................................................................................................
28. Credit for contributions to Idaho educational entities ................................................................................
29. Credit for contributions to Idaho youth and rehabilitation facilities ............................................................
30. Total business income tax credits from Form 44, Part I, line 10. Include Form 44 ....................................
31. Total tax from recapture of income tax credits from Form 44, Part II, line 6. Include Form 44 ..................

23
24
25
26
27
28
29
30
31

32. Tax on Electing Small Business Trust. Add lines 26 and 31, then subtract from lines 27
through 30. Enter total here and on Form 66, page 1, line 22 .................................................................. 32

Worksheet Line 15 Qualified Business
Income Deduction
Resident ESBT
Enter the amount from Federal ESBT Schedule.

Part-year Resident or Nonresident ESBT
Enter the amount from line 4 of the following
worksheet:

Worksheet
1.

Enter the business information in the table below using information from the K-1s and federal Form 8995. Then add the totals for
Column (c) and for column (e).
(a)
Business name

(b)
Taxpayer
identification number

(e)
(d)
(c)
Idaho source qualified
Total qualified business Idaho apportionment
business income or (loss)
factor
income or (loss)
(Multiply Column c by
Column d)

Total:

2. Divide the total of Column (e) by the total of Column (c) for the Idaho percentage of qualified
business income...............................................................................................................................
3. Enter the qualified business income deduction claimed on the federal return ................................
4. Multiply line 2 by line 3 to calculate the Idaho qualified business income deduction.
Enter the amount from line 4 on ESBT Tax Worksheet, Line 15 .....................................................

Worksheet Line 28 Credit for Contributions to
Idaho Educational Entities — If the trust donated
cash to a qualified educational entity, the trust can
claim a tax credit. Donation of goods or services don’t
qualify.
Include amounts from Form ID K-1, Part VIII, line 50 to
calculate the credit amount.

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09-13-2023 

Total:
2
3
4

The credit is limited to the smallest of:
•	 One-half of the amount donated
•	 50% of the tax on ESBT worksheet, line 26
•	 $500
•	 The tax on ESBT worksheet, line 26 less the
amount from the ESBT worksheet, line 27.

Page 4 of 10

Form 66 — Instructions
If you have credit from an ABE (Form ID K-1, Part XI,
line 59) you can add that to the amount computed
above (if any). The total credit is limited to the smallest
of:
•	 50% of the tax on ESBT worksheet, line 26 or
•	 $500
Worksheet Line 29 Credit for contributions to
Idaho youth and rehabilitation facilities — If the
trust donated cash or goods to a qualified Idaho youth
and rehabilitation facility, the trust can claim a tax
credit.
Include amounts from Form ID K-1, Part VIII, line 51
to calculate the credit amount.
The credit is limited to the smallest of:
•	 One-half of the amount donated
•	 20% of the tax computed on the ESBT worksheet,
line 26
•	 $100, or
•	 The tax on ESBT worksheet, line 26 less the
amount from the ESBT worksheet, line 27.
If you have credit from an ABE (Form ID K-1, Part XI,
line 61) you can add that to the amount computed
above (if any). The total credit is limited to the smallest
of:
•	 20% of the tax computed on the ESBT worksheet,
line 26 or
•	 $100
QFTS: If the trust files a composite QFT return, use the
same information and schedules for Idaho as you use to
determine tax on federal Form 1041-QFT. Calculate each
QFT’s Idaho taxable income and liability on a separate
schedule, and include it with the composite Idaho return.
To arrive at the QFT’s Idaho taxable income, each QFT
included in the Idaho composite return should start
with its federal taxable income as reported in the detail
information attached to the federal Form 1041-QFT
composite return. Each QFT’s federal taxable income is
then subject to the Idaho modifications listed on Form 66,
Schedule A.
A QFT isn’t entitled to claim the exemption deduction in
computing Idaho taxable income.
Report the total of the Idaho income tax due for all of the
QFTs on line 22.
Line 24 Estimated Tax Payments
Enter the total amount of payments made and the
amount applied from your 2022 return. If payment is
made under other EINs, provide a schedule with the
EINs, amounts, and rollforwards. Rollforwards are

EIN00044

09-13-2023 

2023 (continued)

refund amounts from the prior year that are rolled
forward to the taxpayer’s current year account rather
than being refunded to the taxpayer.
Line 25 Idaho Income Tax Withheld
Enter the amount of Idaho income tax withheld and
not repaid by an employer on wages and salaries of
a decedent’s estate. Include state copies of W-2s or
1099s.
Line 26 Tax Paid by Affected Business Entity
Enter the amount of tax paid by the affected business
entity on the trust’s share and/or the ESBT’s share of
the affected business entity income.
For trusts and estates that distribute their income to
their beneficiaries, the credit for tax paid by the ABE
should be apportioned between the trust or estate and
the beneficiaries in the same proportion as the income
is allocated to and reported by the trust or estate and
the beneficiaries.
If the trust is a grantor trust, the ABE information
should be included in the grantor letter along with the
income information. The beneficiaries will report their
share of the payment on their individual tax return.
Line 27 Special Fuels and Gasoline Tax Refund
The special fuels (diesel, propane, or natural gas)
tax refund is available to those who use the fuel for
heating or in off-highway equipment and have paid the
tax on the special fuels purchased. Enter the amount
from Form 75, Section IV, line 2. Include Form 75.
The gasoline tax refund is available to those who buy
and use gasoline in off-highway equipment or auxiliary
engines. Enter the amount from Form 75, Section IV,
line 1. Include Form 75.
Line 28 Tax Reimbursement Incentive Credit
Enter the total credit allowed from the Idaho
Reimbursement Incentive certificate. Include a copy of
the certificate with the return.
Line 31 Penalty and Interest
Penalty: Idaho law provides penalties for not filing tax
returns by the due date, not paying tax due on time,
and not prepaying enough on extension returns. For
more information or to calculate a penalty, see our
Penalties and Interest page at tax.idaho.gov/penalties.
Interest: Interest is charged from the due date until
paid. The rate for 2024 is 6%.

Page 5 of 10

Form 66 — Instructions
Line 32 Nonrefundable Credit From a Prior Year
Return
If you were denied a refund from an overpayment of
tax on a prior year return because of the three-year
statute of limitations, you may be eligible to take
a credit for the amount. See Idaho Form 44 for
calculation of your credit and include it with your
return.
Line 35 Refund/Apply to 2024
Refund
Enter the amount of your overpayment from line 34
that you want refunded to you. Refunds of less than
$1 won’t be issued. You have three years from the
return’s due date (not including extensions) to claim
a refund. Refunds will be reduced by unpaid Idaho
tax liabilities and can be applied to unpaid liabilities
owed to other agencies.
The agency or party seizing the refund must send
you notice of the action. Questions about a refund
seizure should be directed to the agency or party
that initiated the claim for seizure.
Apply to 2024
If you’re filing an original return, subtract the
amount you want to refund from line 34. Any
difference will be applied to your 2024 tax and
won’t be refunded.

Schedule A
All trusts and estates must complete Schedule A.
Line 1 Interest and Dividend Income
If you’re a resident or part-year resident trust or estate,
include any taxable interest and dividend income
received in 2023 while an Idaho resident.
For any part of the year you’re a nonresident trust or
estate, include any taxable interest and dividend income
from Idaho sources received in 2023.
Line 2 Income or (Loss)
If you’re a resident or part-year resident trust or estate,
include any business or farm income or loss received in
2023 while an Idaho resident.
For any part of the year you’re a nonresident trust or
estate, include any business or farm income or loss from
Idaho sources received in 2023.
Line 3 Gain or (Loss)
If you’re a resident or part-year resident trust or estate,
include any capital or ordinary gain or loss received in
2023 while an Idaho resident.
EIN00044

09-13-2023 

2023 (continued)

For any part of the year you’re a nonresident trust or
estate, include any capital or ordinary gain or loss
from Idaho sources received in 2023.
Line 4 Rents, Royalties, Partnerships, Other
Estates and Trust
If you’re a resident or part-year resident trust or estate,
include any rents, royalties, partnership or other estate
and trust income received in 2023 while an Idaho
resident.
For any part of the year you’re a nonresident trust
or estate, include any rents, royalties, partnership or
other estate and trust from Idaho sources received in
2023.
Line 5 Other Income
If you’re a resident or part-year resident trust or estate,
include any other income received in 2023 while an
Idaho resident.
For any part of the year you’re a nonresident trust or
estate, include any other income from Idaho sources
received in 2023.
Include a schedule detailing the sources and amounts
of other income.
Line 8 Interest and Dividends not Taxable Under
Internal Revenue Code (IRC)
Column A Enter the interest and dividends net of
applicable amortization received or accrued from
obligations of any state or political subdivision
excluded from federal taxable income under the
provisions of the IRC. If you’re a partner in a
partnership that has Idaho source income, include
your distributive share from Form ID K-1, Part IV,
Column A, line 21. This amount can’t be less than
zero.
Column B Enter the interest and dividends net of
applicable amortization received or accrued from
obligations of any state or political subdivision
excluded from federal taxable income under the
provisions of the IRC received while a resident of
Idaho or from Idaho sources. Include on this line
your apportioned share from Form ID K-1, Part IV,
Column B, line 21. This amount can’t be less than
zero.
Line 9 Addition for Bonus Depreciation
If you claimed federal bonus depreciation for property
placed in service before 2008 or after 2009:
•	 Complete a separate federal Form 4562 or
detailed computation for Idaho depreciation
purposes as if the special depreciation allowance
hadn’t been claimed

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Form 66 — Instructions
•	 Compute the Idaho adjusted basis and any gains
or losses from the sale or exchange of property
using the Idaho depreciation amounts
•	 If the federal depreciation (including gains and
losses) is more than the Idaho depreciation
(including gains and losses), include the difference
as a deduction on this line; otherwise, enter the
difference on Column A, line 13.
Don’t enter any amounts for property acquired during
2008 and 2009
Column A If the federal depreciation is more than
the depreciation calculated without the bonus
depreciation, include the difference on this line. If
you’re a partner in a partnership that has Idaho source
income, include your distributive share from Form ID
K-1, Part IV, Column A, line 22.
Column B If the federal depreciation is more than the
depreciation calculated without the bonus depreciation,
include the difference on this line for the time you were
an Idaho resident or from Idaho sources. Include on this
line your apportioned share from Form ID K-1, Part IV,
Column B, line 22.
Line 10 Other Additions
Column A Enter any miscellaneous Idaho additions.
Include a schedule identifying each addition. Include
unrelated business taxable income on this line. If you’re
a partner in a partnership that has Idaho source income,
include your distributive share from Form ID K-1, Part IV,
Column A, line 23.
Column B Enter the portion of miscellaneous Idaho
deductions, from Column A, while you were an
Idaho resident. Include your distributive share from
Form ID K-1, Part IV, Column B, line 23.
Line 11 Idaho Net Operating Loss (NOL) Carryover
and Carryback
Columns A and B Enter the Idaho NOL carryover.
Include Form 56 or a schedule showing the application of
the loss. Don’t include losses from sources that weren’t
taxable by Idaho or that were incurred before becoming a
resident or part-year resident.
If this is an amended return to claim an NOL carryback,
enter the amount of the NOL carryback. Include Form 56
or a schedule showing the application of the loss.
Enter the total of the NOL carryover and carryback
amounts.

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09-13-2023 

2023 (continued)

Line 12 Income Exempt From Idaho Tax
Column A Enter the amount of interest income received
from U.S. government obligations (U.S. Savings Bonds,
etc.) and Idaho municipal securities not distributed.
Expenses related to the production of this income reduce
the amount you enter here. This amount is adjusted
to reflect the estate tax deduction on page 1, line 6,
attributed to income exempt from Idaho tax.
The fiduciary must provide the beneficiary with the
necessary information if a portion of this adjustment
was distributed. Include a schedule showing your
computations. If you’re a partner in a partnership that
has Idaho source income, include your distributive
share from Form ID K-1, Part IV, Column A, lines 24
and 25.
Column B Enter the portion of income exempt
from Idaho tax, from Column A, while you were an
Idaho resident. Include your distributive share from
Form ID K-1, Part IV, Column B, lines 24 and 25.
Line 13 Subtraction for Bonus Depreciation
If you claimed federal bonus depreciation for property
placed in service before 2008 or after 2009:
•	 Complete a separate federal Form 4562 or
detailed computation for Idaho depreciation
purposes as if the special depreciation
allowance hadn’t been claimed
•	 Compute the Idaho adjusted basis and any
gains or losses from the sale or exchange of
property using the Idaho depreciation amounts
•	 If the federal depreciation (including gains and
losses) is less than the Idaho depreciation
(including gains and losses), include the
difference as a deduction on this line; otherwise,
enter the difference on Column A, line 9
Don’t enter any amounts for property acquired during
2008 and 2009.
Column A If the federal depreciation is less than
the depreciation calculated without the bonus
depreciation, include the difference on this line. If
you’re a partner in a partnership that has Idaho source
income, include your distributive share from Form ID
K-1, Part IV, Column A, line 27.
Column B If the federal depreciation is less than the
depreciation calculated without the bonus depreciation,
include the difference on this line for the time you were
an Idaho resident or from Idaho sources. Include on
this line your apportioned share from Form ID K-1,
Part IV, Column B, line 27.

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Form 66 — Instructions
Line 14 Other Subtractions
Column A Enter any miscellaneous Idaho deductions.
Include a schedule identifying each subtraction.
If you’re a partner in a partnership that has Idaho
source income, include your distributive share from
Form ID K-1, Part IV, Column A, lines 26 and 28.
Column B Enter the portion of miscellaneous Idaho
deductions, from Column A, while you were an
Idaho resident. Include your distributive share from
Form ID K-1, Part IV, Column B, lines 26 and 28.
Line 16 Deductions From Federal Form 1041
Don’t include state income taxes deducted on
Form 1041, line 11.

Schedule B
Compute tax credits according to the following
instructions and the instructions accompanying the
appropriate forms. Credits pass through to beneficiaries
the same way income and expenses are distributed.
The fiduciary must provide each beneficiary with an
Idaho Form ID K-1. This form shows the beneficiary’s
share of credits earned, credits subject to recapture,
and contribution information needed to calculate
certain credits. Each beneficiary uses this information
to determine the amount of Idaho credit allowed,
recapture required, and credit carryovers that exist
on the beneficiary’s Idaho income tax return. Credits
reported by each beneficiary are subject to the
limitations applicable to that beneficiary. Include copies
of Form ID K-1 with your return for the year when the
credit is earned.
If an individual beneficiary’s share of income is taxed on
the trust or estate return, the tax can be offset by that
beneficiary’s share of credits. Credits applied to this tax
are computed based on the credit limitations applicable
to trusts or estates. For example, if a partnership pays
the tax for three individual beneficiaries, the amount of
credit for contributions to educational institutions is the
lesser of the following amounts:
•	 50% of the three beneficiaries’ share of the amount
donated
•	 50% of the tax computed for the three beneficiaries, or
•	 $500
Credits allowed to a beneficiary that aren’t used to
offset that beneficiary’s tax can’t be used to offset the
tax computed for other beneficiaries. The broadband
equipment investment credit can be transferred to
another taxpayer rather than used by the taxpayer who
earns the credit.

EIN00044

09-13-2023 

2023 (continued)

To claim a credit you acquired through a transfer, include
a copy of Form 70, Idaho Statement of Credit Transfer,
with each return you’re claiming transferred credit on.
Line 1 Property Tax Exemption
Check the “Yes” box if you elected the property tax
exemption on personal property that qualifies for the
investment tax credit. Include a copy of Form 49E.
Line 2 Credit for Taxes Paid to Another State
This credit only applies to resident or part-year resident
trusts or estates.
An Idaho trust or estate must report all of its income
regardless of where it was earned. If the trust or estate
also is taxed by another state on income reported on
the Idaho return, it can claim a credit against the Idaho
tax. The credit is limited to the proportion of the Idaho
tax that the federal total income of the trust or estate
derived from sources in the other state and taxed by
that state bears to the federal total income.
If you have credit for taxes paid to more than one
state, use a separate Schedule B for each state. You
must include a copy of the other state’s tax return with
your Idaho return. Enter the total on line 2g. Amounts
on line 2d should be rounded to four digits to the right
of the decimal point. For example, .66666 is rounded
to .6667 and should be entered as 66.67%.
If the trust is an ESBT, complete a separate
Schedule B for the S corporation items. Modify the
Schedule B to report the applicable S corporation
amounts from the ESBT tax computation schedules.
Line 3 Credit for Contributions to Idaho Educational
Entities
Cash donations made by a trust or estate to a
qualified educational entity can qualify for a tax credit.
Donations of goods or services don’t qualify.
Include amounts from Form ID K-1, Part VII, line 50 to
calculate the credit amount.
If the trust or estate pays the tax for one or more
beneficiaries, the credit is limited to the smallest of:
•	 The beneficiary’s share of one-half of the amount
donated
•	 50% of the tax computed for the beneficiary
•	 $500, or
•	 The beneficiary’s tax, minus the amount on
Schedule B, line 2g attributable to that beneficiary

Page 8 of 10

Form 66 — Instructions
If you have credit from an ABE (Form ID K-1, Part XI,
line 59), you can add that to the amount computed
above (if any). The total credit is limited to the smallest
of:
•	 50% of the tax computed for the beneficiary or
•	 $500.
Don’t enter the total credit earned by the trust or
estate if the trust or estate isn’t paying the tax for all
the beneficiaries.
A qualified educational entity includes:
•	 A nonprofit corporation, fund, foundation,
research park, trust, or association organized
and operated exclusively for the benefit of Idaho
colleges and universities
•	 A nonprofit, private, or public Idaho school
(elementary, secondary, or higher education) or
its foundation
•	 Idaho education public broadcast system
foundations
•	 The Idaho State Historical Society or its
foundation
•	 An Idaho public library or its foundation
•	 An Idaho library district or its foundation
•	 An Idaho public or private nonprofit museum
•	 The Idaho Commission for Libraries
•	 Idaho Commission on Hispanic Affairs
•	 Idaho Commission for the Blind and Visually
Impaired
•	 Idaho Council on Developmental Disabilities
•	 Idaho State Independent Living Council
•	 Idaho STEM Action Center
•	 Idaho Council for the Deaf and Hard of Hearing
•	 Medical residency programs or support
organizations devoted to training residents in
Idaho
Line 4 Credit for Contributions to Idaho Youth and
Rehabilitation Facilities
A trust or estate can claim this credit if it donated cash or
goods to the following:
•	 Qualified center for independent living
•	 Youth or rehabilitation facility or its foundation, or
•	 Nonprofit substance abuse center licensed by the
Idaho Department of Health and Welfare
Include amounts from Form ID K-1, Part VII, line 51 to
calculate the credit amount.

EIN00044

09-13-2023 

2023 (continued)

If the trust or estate pays the tax for one or more
beneficiaries, the credit is limited to the smallest of:
•	 The beneficiary’s share of one-half of the amount
donated
•	 20% of the tax computed for the beneficiary
•	 $100, or
•	 The beneficiary’s tax less the amounts attributable
to that beneficiary on lines 2g and 3 and Form 44,
Part I, line 1
If you have credit from an ABE (Form ID K-1, Part XI, line
61), you can add that to the amount computed above (if
any). The total credit is limited to the smallest of:
•	 20% of the tax computed for the beneficiary or
•	 $100
Don’t enter the total credit earned by the trust or estate
if the trust or estate isn’t paying the tax for all the
beneficiaries.
The qualified youth or rehabilitation facilities and their
foundations are:
•	 Anchor House
•	 The Arc, Inc., Boise
•	 The Children’s Home Society of Idaho, Inc., Boise
•	 The Children’s Village, Inc., Coeur d’Alene
•	 Dawn Enterprises, Inc., Blackfoot
•	 Development Workshop, Inc., Idaho Falls
•	 Gem Youth Services, Emmett
•	 Hope House, Inc., Nampa
•	 Idaho Drug Free Youth, Inc., Coeur d’Alene
•	 Idaho Elks Rehabilitation Hospital, Inc., Boise
•	 Idaho Youth Ranch
•	 Kinderhaven, Sandpoint
•	 Learning Lab, Inc., Boise
•	 Magic Valley Rehabilitation Services, Inc.,Twin Falls
•	 New Day Products, Inc., Pocatello
•	 Northwest (North Idaho) Children’s Home
•	 Opportunities Unlimited, Inc., Lewiston
•	 Panhandle Special Needs, Inc., Sandpoint
•	 Project P.A.T.C.H. (Planned Assistance for Troubled
Children)
•	 Shepherd’s Home, Inc., McCall
•	 Transitional Employment Services for the
Handicapped, Coeur d’Alene
•	 Walker Center, Gooding
•	 Winchester Occupational Workshop, Winchester
•	 Witco Inc., Caldwell
•	 Women’s and Children’s Alliance
Page 9 of 10

Form 66 — Instructions
The following are the qualified centers for independent
living:
•	 Disability Action Center Northwest, Moscow and
Coeur d’Alene
•	 Living Independence Network Corporation, Boise
and Twin Falls
•	 Living Independently For Everyone, Inc., Blackfoot,
Idaho Falls, and Pocatello

2023 (continued)

You’re also authorizing the paid preparer to:
•	 Give the Tax Commission any information that’s
missing from your return, and
•	 Call the Tax Commission for information about
the processing of your return or the status of your
refund or payments
You aren’t authorizing the paid preparer to receive
any refund check, bind you to anything including any
additional tax liability, or otherwise represent you before
the Tax Commission.

Line 5 Total Business Income Tax Credits
Enter the total business income tax credits from
Form 44, Part I, line 10. Include Form 44.

This authorization is valid for up to 180 days from the
date the Tax Commission receives the return. If you
want the Tax Commission to contact you instead of your
preparer, leave the box blank.

Signature
The fiduciary or an officer representing the fiduciary must
sign the return.

Tax Preparer
Check this box if you paid a tax preparer to complete
your return, and you’re authorizing the Tax Commission
to discuss your return with the paid preparer identified on
your return.

Idaho Fiduciary Tax Computation Schedule
If Idaho taxable income is:

The tax is:

Less than or equal to $4,489 ..............................................

0

$4,489 or more ...................................................................

5.8% of excess over $4,489

Contact us:

In the Boise area: (208) 334-7660 | Toll free: (800) 972-7660
Hearing impaired (TDD) (800) 377-3529
tax.idaho.gov/contact
EIN00044

09-13-2023 

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