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California Free Printable  for 2024 California Amended Corporation Franchise or Income Tax Return (Fill-in)

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Amended Corporation Franchise or Income Tax Return (Fill-in)
Form 100-X

TAXABLE YEAR For calendar year Amended Corporation Franchise or Income Tax Return or fiscal year beginning (mm/dd/yyyy) CALIFORNIA FORM 100X , and ending (mm/dd/yyyy) . Corporation name California corporation number Additional information RP FEIN California Secretary of State file number Street address (suite/room no.) PMB no. City State Foreign country name Foreign province/state/county Questions. See instructions. Yes No • • • • • • • • • A Did this corporation file an amended return with the IRS for the same reason? B Has the IRS advised this corporation that the original federal return is, was, or will be audited? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C Is this amended return based on a final federal determination(s)? . . . . . . . . . . If so, what was the final federal determination date(s)? D Is this return an amended Form 100? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E Is this return an amended Form 100W? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • • • • •  1 Net income (loss) before state adjustments . . . . . . . . . . . . . . .  2 Additions to net income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3 Deductions from net income . . . . . . . . . . . . . . . . . . . . . . . . . .  4 Net income (loss) after state adjustments. Combine lines 1 through 3.  5 Net income (loss) from Schedule R. See instructions . . . . . . . Part II Computation of Tax, Penalties, and Interest Foreign postal code Yes No • • • F Is this return an amended Form 100S? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • If yes, enter the maximum number of shareholders in the S corporation at any time during the taxable year. Do not leave blank. . . . . . . . . . . . . . . . . . . . . _____ G Is this return a protective claim?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • H Was the corporation’s original return filed pursuant to a water’s-edge election? • • I During this taxable year, was 50% or more of the stock of this corporation owned by another corporation? . . . . . . . . . . . . . . . . . . . . . . . . . . . • • J During this taxable year, were gross receipts (less returns and allowances) of this corporation more than $1 million? . . . . . . . . . . . . . . . . . . . • • • • (a) Originally reported/adjusted Part I Income and Deductions ZIP code 1 2 3 4 5 (b) Net change (c) Correct amount .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 • .00 .00 .00 .00  6 Net income (loss) for state purposes (Part I, line 4 or line 5) . •   6 .00 • .00 • .00  7 Net operating loss (NOL) deduction. See instructions . . . . . . 7 .00 .00 • .00  8 EZ, TTA, or LAMBRA NOL deduction. See instructions . . . . . . 8 .00 .00 • .00  9 Disaster loss deduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 .00 .00 • .00 10 Net income for tax purposes. Combine lines 6 through 9. . . . 10 .00 .00 • .00 11 Tax % x line 10. See instructions. . . . . . . . . . . . . . . • 11 .00 .00 • .00 12 Tax credits: . . . . 12 .00 .00 • .00 13 Tax after credits (not less than minimum franchise tax plus QSub annual tax(es), if applicable) . . . . . . . . . . . . . . . . . 13 .00 .00 • .00 14 Alternative minimum tax. See instructions . . . . . . . . . . . . . . 14 .00 .00 • .00 15 Tax from Schedule D (100S) (Form 100S filers only) . . . . . . . 15 .00 .00 • .00 16 Excess net passive income tax (Form 100S filers only) . . . . . 16 .00 .00 • .00 17 Pass-through entity elective tax (Form 100S filers only) . . . 17 .00 .00 • .00 18 Other adjustments to tax. See instructions . . . . . . . . . . . . . . 18 .00 .00 • .00 19 Total tax. Combine line 13 through line 18 . . . . . . . . . . . . . . . • 19 .00 .00 • .00 20 Penalties and interest. (a) .00 • (b) See instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 .00 .00 (c) .00 21 Revised balance. Add line 19, column (c), and line 20 (c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 • .00 Part III Payments and Credits 22 Estimated tax payments (include overpayment from prior year allowed as a credit) . . . . . . . . . . . . . . . . . . . . . . . . . . . •  22 .00 23 Amount paid with extension of time to file tax return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •  23 .00 24 Payment with original tax return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •  24 .00 25 Withholding (Forms 592-B and/or 593).  a) originally reported/adjusted • b) net change   c) correct amount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • 25c .00 26 Other payments. See instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •  26 .00 27 Total payments. Add line 22 through line 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •  27 .00 (continued on Side 2) 3631233 Form 100X  2023  Side 1 (continued from Side 1) 28 Overpayment, if any, shown on original tax return, or as later adjusted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Balance. Subtract line 28 from line 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •  28 •  29 .00 .00 Part IV Amount Due or Refund 30 Amount due. If line 21 is more than line 29, subtract line 29 from line 21. See instructions . . . . . . . . . 31 Refund. If line 29 is more than line 21, subtract line 21 from line 29. See instructions. . . . . . . . . . . . . •  30 •  31 . 00 . 00 Part V Explanation of Changes  1 Enter name, address, California corporation number, and/or FEIN used on original tax return (if same as shown on this amended return, write “Same”). Corporation name California corporation number Additional information California Secretary of State file number Street address (suite/room no.) PMB no. City State Foreign country name FEIN Foreign province/state/county ZIP code Foreign postal code   2 Explanation of changes to items in Part I, Part II, Part III, and Part IV. Enter the line number from Side 1 for each item that is changing and give the reason for each change. Attach all supporting forms and schedules for items changed. Include federal schedules if a change was made to the federal return. Be sure to include the corporation name and California corporation number on each attachment. Refer to the forms and instructions for the taxable year that is being amended. _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ _______________________________________________________________________________________________________________________________ Sign Here Under penalties of perjury, I declare that I have filed an original return and I have examined this amended return, including accompanying schedules and statements, and to the best of my knowledge and belief, this amended return is true, correct, and complete. Declaration of preparer (other than taxpayer) is based on all information of which preparer has any knowledge. Signature of officer Title Date • Telephone Preparer’s signature Date Check if self- • PTIN ▶ ▶ employed  □ Paid Preparer’s Use Only Firm’s name (or yours, if self-employed) and address ▶ Side 2  Form 100X  2023 • Firm’s FEIN • Telephone 3632233
Extracted from PDF file 2023-california-form-100-x.pdf, last modified July 2023

More about the California Form 100-X Corporate Income Tax Amended Return TY 2023

We last updated the Amended Corporation Franchise or Income Tax Return (Fill-in) in February 2024, so this is the latest version of Form 100-X, fully updated for tax year 2023. You can download or print current or past-year PDFs of Form 100-X directly from TaxFormFinder. You can print other California tax forms here.

Other California Corporate Income Tax Forms:

TaxFormFinder has an additional 174 California income tax forms that you may need, plus all federal income tax forms.

Form Code Form Name
3805-Z Booklet Enterprise Zone Business Booklet
Form 100-ES Corporation Estimated Tax
Form 541 Schedule K-1 Beneficiary's Share of Income, Deductions, Credits, etc.
Form 3539 (Corp) Payment for Automatic Extension for Corps and Exempt Orgs
Form 3537 (LLC) Payment for Automatic Extension for LLCs

Download all CA tax forms View all 175 California Income Tax Forms


Form Sources:

California usually releases forms for the current tax year between January and April. We last updated California Form 100-X from the Franchise Tax Board in February 2024.

Show Sources >

Form 100-X is a California Corporate Income Tax form. An amended tax return is used to correct errors or omissions in a previously-filed tax return. While taxpayers will not generally be punished simply for correcting an error in a previous return, errors that resulted in an underpayment of owed tax can sometimes result in penalties or interest owed.

About the Corporate Income Tax

The IRS and most states require corporations to file an income tax return, with the exact filing requirements depending on the type of company.

Sole proprietorships or disregarded entities like LLCs are filed on Schedule C (or the state equivalent) of the owner's personal income tax return, flow-through entities like S Corporations or Partnerships are generally required to file an informational return equivilent to the IRS Form 1120S or Form 1065, and full corporations must file the equivalent of federal Form 1120 (and, unlike flow-through corporations, are often subject to a corporate tax liability).

Additional forms are available for a wide variety of specific entities and transactions including fiduciaries, nonprofits, and companies involved in other specific types of business.

Historical Past-Year Versions of California Form 100-X

We have a total of thirteen past-year versions of Form 100-X in the TaxFormFinder archives, including for the previous tax year. Download past year versions of this tax form as PDFs here:


2022 Form 100-X

2022 Form 100x Amended Corporation Franchise or Income Tax Return

2021 Form 100-X

2021 Form 100x Amended Corporation Franchise or Income Tax Return

2020 Form 100-X

2020 Form 100X Amended Corporation Franchise or Income Tax Return

2019 Form 100-X

2019 Form 100X - Amended Corporation Franchise or Income Tax Return

2018 Form 100-X

2018 Form 100X - Amended Corporation Franchise or Income Tax Return

2017 Form 100-X

2017 Form 100x - Amended Corporation Franchise or Income Tax Return

2016 Form 100-X

2016 Form 100X Amended Corporation Franchise or Income Tax Return

Amended Corporation Franchise or Income Tax Return (Fill-in) 2015 Form 100-X

2015 Form 100X -- Amended Corporation Franchise or Income Tax Return

Amended Corporation Franchise or Income Tax Return 2014 Form 100-X

2014 Form 100X -- Amended Corporation Franchise or Income Tax Return

Amended Corporation Franchise or Income Tax Return (Fill-in) 2013 Form 100-X

2013 Form 100X -- Amended Corporation Franchise or Income Tax Return

2012 Form 100-X

2012 Form 100X -- Amended Corporation Franchise or Income Tax Return

2011 California Form 100X 2011 Form 100-X

2011 Form 100X -- Amended Corporation Franchise or Income Tax Return


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