California Income Tax Amendment

Made a mistake on your California income tax return? You can fix it! Here's what you need to do:

  • Resident or Non-resident? Use Form 540 (resident) or Form 540NR (non-resident) along with Schedule X to explain the changes.
  • Prepare Online, Mail Later: Though helps create your amended return, it can't submit it electronically. Print, sign, and mail it to the Franchise Tax Board.
  • Different Forms, Different Agencies: Remember, the IRS uses Form 1040X for amendments, not Form 1040.

Who Needs to Amend?

The California Franchise Tax Board (FTB) might notify you of an error, or you might find one yourself. Amending is also recommended if the IRS amends your federal return and it affects your California taxes. Ideally, file your California amendment within one year.

Prepare only a CA State Return without an IRS return. Details
Step by step instructions on how to Complete and Download—not e-File—State Returns on
File a California Tax Amendment
Prepare your CA Amendment here on for the current tax year. Once completed, print the PDF from your My Account, check the box and mail in the form to the address listed below. For other tax years complete the form below before you print, sign and mail in the form.
Option 1: Sign into your account, modify your Return and download/print your updated CA Form 540/540NR under My Account. Then, complete Schedule X (amended return explanation). Attach Schedule X to your updated Form 540/540NR, sign the amended return and mail it to one of the addresses listed below.
Option 2: Don't have an account? Follow the step by step instruction on how to prepare a tax return/amendment.
Option 3: Want to do the math on your own paper return? Complete, sign CA Form 540 or Form 540NR and Schedule X Print, Mail the Form to CA Tax Department to:
Refund Amendment Return:
Franchise Tax Board
PO Box 942840
Sacramento CA 94240-0001
Tax Due Amendment Return:
Franchise Tax Board
PO Box 942867
Sacramento CA 94267-0001
CA Tax Amendment Form CA 540 or 540NR
This Form can be used to file an: Income Tax Return, Tax Amendment, Change of Address. Complete a new Form CA 540 or 540NR and attach a completed Schedule X to the Form.
Step 1: Select the CA Form 540 or 540NR by Tax Year below.
Step 2: Complete Schedule X.
Step 3: Sign, Mail Form 540 or 540NR and Schedule X to one of the addresses listed above.
Check this box on the CA Tax Return Form 540 or 540NR. This Form can be used to file a: Tax Return, Tax Amendment, Change of Address.

California Amendment

Current Tax Year only: Prepare online on until October Deadline . When you are done, Print, Sign and Mail in—not eFile—Your Tax Amendment, Address Change, etc.
After October Deadline Prepare, Print, Sign and Mail-In—see address above—your Form CA 540 or Form CA 540NR
How to correct a rejected Tax Return
If your CA Tax Return was rejected by the CA Tax Agency—not—instructions on how to correct a rejected California Tax Return.
Check Your CA Tax Amendment Status
1. Call the CA Franchise Tax Board at 800-852-5711.
2. Contact the CA Franchise Tax Board
California Refund Deadlines
A. Three years from the original tax year return's deadline (including valid filing extensions).
B. One year from the final determination of the amended federal return or federal change (whichever is later) provided that the allowable refund is not more than the decrease in California tax attributable to the federal change or correction.
C. Two years from the payment of an assessment, provided the amended return raises issues relating only to the prior assessment and the refund does not exceed the amount of tax paid on the prior assessment.
D. Two years from the filing of an amended California return resulting in the payment of additional tax, provided that the current amended return raises issues relating solely to the prior amended return and that the refund does not exceed the amount of the tax payment made as a result of the prior amended return.
Additional California Tax Income Taxes Deadlines
California Income Tax Penalties
Find out how California Late Filing and Late Payment Penalties are calculated.
For IRS Tax and Late Filing Penalties we have an easy to use tool: The PENALTYucator.
File an IRS Tax Amendment by Tax Year
Instructions on how to prepare an IRS Tax Amendment on Note that the IRS does not accept Tax Amendments electronically. You mail it in. 

Will I get a bigger tax refund in 2024?

Many taxpayers can expect a bigger tax refund on their 2023 taxes. To help you keep up with soaring inflation, the IRS is making bigger changes than usual that could save you big money on your 2023 taxes, which is the tax return you'll file in 2024.

Take control of your personal life relationships, finances, and taxes: follow the tips on this page and keep up with tax planning for next year. You can use this free Tax Refund Calculator 2023 to get a high-level understanding of your taxes.