# Form 540

URL: https://pdf.net/pdf-forms/tax-forms/form-540
Category: Tax Forms
Attributes: Trusted by accountants, Official [STATE] form

Form 540, or California's resident income tax return, is a document that residents of this state use to report their income, claim credits, calculate what they owe, or get refunded by the Franchise Tax Board.

You can skip the paperwork and get a fillable Form 540 online. Our platform allows you to complete it in minutes and download your finished return right away!

## Versions

- 2025 — [download PDF](https://cdn.sanity.io/files/i16te7yp/production/fab5fd670fd02aa811988cc2a2ff5a54d05c576a.pdf)

## How to Fill Out Form 540

1. Access the printable Form 540 on pdf.net
2. Enter your name, address, and filing status
3. Report wages, income, and adjustments
4. Claim exemptions and standard or itemized deductions
5. Add any tax credits you qualify for
6. Review your tax due or refund amount
7. Sign and download your completed return

## Facts

### What Is Form 540 Used For?

Form 540 is used to report your California taxable income to the Franchise Tax Board and calculate state tax owed or refunded. Despite occasional searches for "IRS Form 540," it's a state return, not a federal one; the IRS uses Form 1040 instead.

### Who Should Use Form 540?

Full-year California residents who meet the state's income tax filing requirements and do not qualify for the simpler Form 540 2EZ should use this form. The Form 540 filing requirements depend on factors such as income, filing status, age, and dependents. Nonresidents and part-year residents generally use Form 540NR instead.

### When Is Form 540 Due?

The Form 540 due date is April 15 each year, matching the federal deadline. If you need more time, California grants an automatic six-month filing extension to October 15, though any tax owed is still due by the April deadline to avoid interest.

### What Happens If Form 540 Is Not Submitted?

If the form isn’t submitted, this triggers late-filing Form 540 penalties of up to 25% of the unpaid tax, plus interest. If the return is more than 60 days late, the minimum penalty is $135 or 100% of the unpaid tax, whichever is less, and unpaid amounts may continue to accrue interest until paid.

### How and Where Do I File Form 540?

You should e-file your Form 540 for California return through CalFile or approved software, or follow the official Form 540 instructions to file by mail. Refunds or no-balance-due returns go to different Sacramento addresses, both listed on the FTB site.