Mail both returns. The e-file is available only for current (2023) tax returns. Amendments, both federal and state must be mailed to the IRS and the appropriate state address.
The mailing address for a California amended return is:
- If you are due a refund, have no amount due, or paid electronically, mail your tax return to: FRANCHISE TAX BOARD, PO BOX 942840, SACRAMENTO CA 94240-0001
- If you owe, mail your return and check or money order to: FRANCHISE TAX BOARD, PO BOX 942867, SACRAMENTO CA 94267-0001
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