California allows you to amend all prior year tax returns.
What it limits is how far back they will issue refunds:
Generally, you must file your claim for refund by the later of:
- 1 year from the date of overpayment
- 4 years after the original return due date.
- If you filed before the due date, you have 4 years from the original return due date to file a claim.
- If you filed after the extension, the return is late. You have 4 years from the original return due date to file a claim.
- If you made payments and never filed a tax return, you have 4 years from the original return due date to file a claim.
- 4 years after the date of a timely filed return, if filed within the extension period.
This information and more is found here: California Amendments
[Edited 2.20.24 | 5:09am]
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