2025 California Form 540
Printable CA-540 Tax Forms and Instructions
What Is California Form 540?
California Form 540 is used by full-year residents to file their state income tax return. The purpose of Form 540 is to calculate how much income tax you owe the state of California. Nonresident and Part-Year resident filers will complete California Form 540NR. Taxpayers with simple returns have the option to use the Short Form 540 2EZ.
In general, any full-year resident can choose to file Long Form 540 instead of Short Form 540 2EZ. You do not have to file the Short Form, for example. You must, however, use the longer California Form 540 in many situations. Common reasons include any of the following.
- Claim more than three dependents.
- You file as Married or Registered Domestic Partnership (RDP) filing separately.
- Total income exceeds $100,000 if Single or Head of Household.
- Total income exceeds $200,000 if Married/RDP filing jointly or Qualifying Surviving Spouse/RDP.
- You claim any adjustments to income (student loan interest, IRA deduction, alimony paid, etc).
- You made estimated tax payments or have an estimated tax payment transfer from 2024.
- You itemize deductions.
- You have income from sources other than salaries, wages, tips, interest, and dividends.
- You have real estate or other withholding from Form 592-B or Form 593.
- You are claiming income or a loss on federal Schedules C, D, E, or F.
- You are claiming a credit for taxes paid to another state.
Read the Which Form To File
section of the CA Form 540 instructions book to help determine if you should file as a resident, part-year resident, or nonresident for tax year 2025.
That section of the instructions booklet will also discuss the criteria for choosing between the Short Form and Long Form for tax year 2025.
Who Must File California Form 540?
You must file a California tax return if your gross income or California adjusted gross income is more than the amount shown for your filing status, age, and number of dependents. For tax year 2025, Single full-year residents under age 65 with no dependents generally must file if their gross income is more than $22,941. Married or Registered Domestic Partnership full-year residents under age 65 with no dependents generally must file if their gross income is more than $45,887. Part-year and nonresident filers may need to adjust and prorate these amounts.
Gross income means all income before deducting expenses that are reportable to the state of California. Even if your gross income is below the amount specified for your filing status, you may still want to file a California tax return. You may receive a refund for the state tax amount shown on your California W-2, for example. You may also be eligible for the California Earned Income Tax Credit (EITC), Young Child Tax Credit (YCTC), Foster Youth Tax Credit (FYTC), and other low-income related credits.
Read the Filing Requirements
section of the California 540 instructions book to help determine if you should file a state income tax return for tax year 2025.
Printable California State Tax Forms
Printable California Form 540 Instructions
Click any of the California income tax forms and instructions links above to download, save, view, and print the file for the corresponding year. These free PDF files are unaltered and are sourced directly from the publisher.
How To Check The Status Of My California Tax Return?
To check the status of your California 540 income tax return online, visit the State of California Franchise Tax Board website and use their Check Your Refund Status service. The State of California Franchise Tax Board estimates that it will take up to 3 weeks to receive your refund from an electronically filed return and up to 3 months for a mailed-in paper return.
To check the status of your California income tax return for 2025, you will need the following information:
- Social Security Number or ITIN
- Numbers in your mailing address
- ZIP Code
- Exact refund amount
The requested information must match what was submitted on your 2025 California Form 540. To check prior year returns, you will need to contact the State of California Franchise Tax Board service center by phone, email, or mail.
To contact the State of California Franchise Tax Board service center by phone or email, use the check your refund status link above. Alternatively, read or print the 2025 California Form 540 instructions to obtain the proper phone number and mailing address.
Frequently Asked Questions (FAQ)
Here are answers to common questions about printing, mailing, documenting, and filing California Form 540. These FAQ focus on practical details from the official form and instructions.
When is California Form 540 due?
For tax year 2025, California Form 540 is generally due April 15, 2026. If you need more time to file, review the extension rules in the California Form 540 instructions, but pay any tax due by the original deadline to avoid penalties and interest.
Should I use a pencil or pen on California Form 540?
Use black or blue ink on the tax return you send to the Franchise Tax Board. Print numbers and capital letters clearly in the spaces provided, and line up dollar amounts.
Do I need to mail all pages of California Form 540?
Yes. The California Form 540 instructions say Form 540 has six sides and that all six sides must be sent to the Franchise Tax Board. If you print one side per sheet, mail all six printed pages in order. Side 6 must be signed.
Do I include Forms W-2 and 1099 with California Form 540?
Attach all Forms W-2 and W-2G to the lower front of your tax return. Also attach any Forms 1099, 592-B, and 593 that show California income tax withheld. If you forget to send a W-2 or withholding form, wait for the FTB to request it instead of sending it separately.
Do I include my federal return with California Form 540?
Do not attach your federal Form 1040 or 1040-SR unless the California instructions require it. Attach a copy of your federal Form 1040 or 1040-SR and all supporting federal forms and schedules if you attached federal forms or schedules other than Schedule A or Schedule B to your federal return. If you did not itemize federally but itemize for California, attach federal Schedule A.
Can I amend a California Form 540 after filing it?
Yes. If you discover an error after filing Form 540, file an amended Form 540 and attach Schedule X. Check the amended return box at the top of Form 540 and follow the current California instructions for required explanations and attachments. Do not attach your previously filed return to the amended return.
How long should I keep my California tax records?
Keep a copy of your California tax return and records that verify the income, deductions, adjustments, or credits reported on it. The California instructions booklet says that requests for information usually occur within the later of four years from the return due date or four years from the date filed. Keep some records longer, such as property records, carryover records, and records related to deferred gains.
Last updated: July 15, 2026
References:
- Franchise Tax Board. State of California. Retrieved July 15, 2026.
- Due Dates Personal. State of California, Franchise Tax Board. Retrieved July 15, 2026.
- 2025 Instructions for Form 540 2EZ. State of California, Franchise Tax Board. Retrieved July 15, 2026.
- 2025 California Form 540 Forms and Instructions. State of California, Franchise Tax Board. Retrieved July 15, 2026.
- 2025 Form 540 California Resident Income Tax Return. State of California, Franchise Tax Board. Retrieved July 15, 2026.