California (CA)
April 15, 2026
October 15, 2026
✓ Automatic
CA — CaliforniaCalifornia Personal Income Tax Extension — What You Need to Do
California automatically extends your personal income tax filing deadline to October 15, 2026 — no form, no federal extension required, no application needed. The Franchise Tax Board (FTB) grants the extension to every taxpayer automatically. Your only obligation before April 15 is to pay any California tax you owe.
California Extension Checklist — 2026
Two things to handle. One deadline that matters.
April 15, 2026
Pay Any California Tax You Owe
California’s extension covers filing only — not payment. Pay any balance by April 15 to avoid penalties and interest.
Check or Money Order with Form FTB 3519 Franchise Tax Board
PO Box 942867
Sacramento, CA 94267-0008
October 15, 2026
File Federal + California Return
File your federal return now and add your California state return — Form 540, 540NR, or 540 2EZ — in the same session. Filing sooner means a faster refund. Your California extended deadline is October 15.
Start Federal + California Return →
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California Late Payment Penalties — What It Costs to Wait
The extension gives you until October 15 to file. But unpaid tax starts costing you money the day after April 15.
| Penalty Type | Rate | Cap | Trigger |
|---|---|---|---|
| Failure to Pay | 5% of unpaid tax (one-time) + 0.5%/month | 25% | Unpaid balance after April 15 |
| Failure to File | 5% per month | 25% | Missing the October 15 extended deadline |
| Interest | Varies (FTB rate) | No cap | Accrues from April 15 on any unpaid balance |
California State Extension Details
| Extension Type | Automatic — No Form Required |
| Original Filing Deadline | April 15, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Extension Period | 6 months |
| Extension Form | None required — Form FTB 3519 is a payment voucher only |
| Return Form | Form 540 / 540NR / 540 2EZ |
| Federal Extension Required? | No — California’s extension is fully independent |
| Payment Deadline | April 15, 2026 (extension does not extend payment) |
| Online Payment Portal | ftb.ca.gov/pay (Web Pay) |
| State Agency | California Franchise Tax Board (FTB) |
| Failure to File Penalty | 5% of unpaid tax per month, up to 25% |
| Failure to Pay Penalty | 5% of unpaid tax (one-time) + 0.5% per month, up to 25% |
California Tax Extension — Frequently Asked Questions
Do I need to file any form to get the California extension?
No. California grants a 6-month extension automatically to every individual income tax filer. You do not need to file Form FTB 3519, request approval, or have a federal extension. Your deadline is automatically October 15, 2026.
What is Form FTB 3519 — do I need it?
Form FTB 3519 is a payment voucher used only when mailing a check or money order. It is not an extension form. If you pay online at ftb.ca.gov/pay or owe no taxes, you do not need Form FTB 3519 at all.
Does the California extension cover my federal return?
No. The California extension only covers your state filing. Your federal return requires a separate extension (Form 4868) if you need more time with the IRS.
What if I can’t pay my full California tax by April 15?
Pay as much as you can. California’s failure-to-pay penalty starts with a one-time 5% charge plus 0.5% per month on the remaining balance. Every dollar paid by April 15 reduces your total penalty exposure.
Which California return form do I need?
Form 540 is the standard California individual income tax return. Form 540NR is for nonresidents and part-year residents. Form 540 2EZ is a simplified version for qualifying filers. All are due by October 15, 2026.
Is my California refund delayed if I use the extension?
Yes — the FTB can’t process your refund until you file your completed return. If you expect a refund, file as soon as you’re ready rather than waiting until October 15.
Ready to File? Start Federal + California
File your federal return and add California state in the same session. October 15 extended deadline — secure, fast, with live support.