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California Form 540-X (California Explanation of Amended 2026
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- Click ‘Get Form’ to open it in the editor.
- Begin by entering your name(s) as shown on the amended tax return at the top of the form. This ensures that your submission is correctly attributed.
- In Part I, input your Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) in the designated field.
- Fill in the financial adjustments section. Enter the amount you owe from your amended return and any overpaid tax from your original return.
- Calculate totals by adding relevant lines as instructed, ensuring accuracy for both amounts owed and refunds.
- In Part II, check all applicable reasons for amending your return. Provide further explanations if necessary, attaching additional sheets if needed.
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ca ftb amended return
Complete this form so that your employer can withhold the correct California state income tax from your pay. Personal Information. First, Middle, Last Name.Read more
Jan 14, 2026 California Explanation of Amended Return Changes (540 Schedule X) Submit your amended return online or by mail: