For a 2025 California individual income-tax return filed in 2026, the automatic extension gives you until October 15, 2026, to file—but it does not give you extra time to pay. The tax was due April 15, 2026. If you cannot pay everything, file on time, pay as much as you can immediately, and request an installment agreement rather than waiting for the balance to grow.
The short answer: filing and paying have different deadlines
California’s Franchise Tax Board (FTB) automatically gives individuals a six-month extension to file a state income-tax return. You do not submit a separate extension application. For the 2025 tax year, the extended filing deadline is October 15, 2026.
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The extension changes only when the return is due. It does not move the payment deadline. Any 2025 California tax owed was due April 15, 2026, even if you planned to file during the extension period. As the FTB states, “An extension to file only extends your filing due date, not your payment due date.”
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Which California option fits your situation?
| Route | What it does | Timing for a 2025 individual return | Cost or consequence |
|---|---|---|---|
| Automatic filing extension | Provides more time to submit the return | Return due October 15, 2026; no application required | Tax still due April 15, 2026 |
| Form FTB 3519 extension payment | Lets you send an estimated payment while planning to file by the extended deadline | Used for a balance connected with a return originally due April 15 | Does not change the original payment due date |
| Installment agreement | Requests monthly payments from the FTB | Apply with Form FTB 3567 or through the FTB’s online individual plan process | Online terms list a $34 setup fee added to the balance; penalties and interest may continue |
| Penalty relief | Asks the FTB to remove an eligible penalty | Request after reviewing your filing, payment history, and circumstances | Eligibility conditions apply; the cited relief does not waive interest |
| Existing-plan skip request | May allow one upcoming installment to be skipped when you temporarily cannot afford it | Request within 30 days of the installment’s due date and at least five days before that due date | Interest and penalties continue, and the repayment period is extended |
Follow this sequence if you cannot pay in full
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Confirm the tax year and that you are filing as an individual
The dates in this guide apply to a 2025 California personal income-tax return filed in 2026. Business-entity deadlines use different rules. If a deadline falls on a weekend or holiday, FTB instructions generally move it to the next business day; check the official calendar for the year you are filing.
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File the return by October 15, 2026
Submit the complete California return by the extended filing date even when you still owe money. An extension is not permission to postpone filing indefinitely. Missing the extended date can create a separate late-filing penalty and interest in addition to charges for late payment.
Use your actual tax information rather than delaying because you cannot make a payment. Filing establishes the balance more accurately and prevents the filing deadline from becoming another source of charges.
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Pay whatever amount is affordable immediately
FTB’s 2025 voucher instructions tell taxpayers who cannot pay in full by April 15, 2026, to pay as much as possible when submitting Form FTB 3582. A partial payment reduces the unpaid principal on which later charges are based. If you discover additional tax after filing, pay that amount promptly rather than waiting for a notice.
When using FTB Web Pay, select the payment category that matches the transaction. The FTB distinguishes an extension payment, a tax-return payment, and a bill payment. Form FTB 3519 is for an extension payment when you owe on a return due April 15 and intend to file by October 15; it is not a way to rewrite the original payment deadline.
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Request monthly payments for the remaining balance
For an unpaid individual balance, request an installment agreement with Form FTB 3567 or use the FTB’s online individual installment-plan service. The online terms last updated September 24, 2025, list a $34 setup fee that is added to the balance and monthly automatic withdrawals from a bank account.
Approval is not automatic. The FTB’s terms require you to keep filing future returns and pay future taxes on time while the agreement is active. The reviewed guidance does not establish a universal approval threshold, maximum term, or guaranteed monthly amount, so do not assume a plan will be accepted for a particular payment or duration.
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Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.Continue making any required payments and follow the agreement’s instructions after applying. A payment plan manages collection of the balance; it does not erase the underlying tax, late-payment penalty, or interest that the law requires.
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If you already have a plan, contact the FTB before missing a payment
Use MyFTB to manage an existing payment plan. The FTB says you may be eligible to request that the next installment be skipped when the request is made at least five days before the installment’s due date and within 30 days from that due date. Those timing conditions are separate requirements, not a general payment holiday.
Interest and penalties continue during a skipped installment, and the repayment period is extended. A request made after the allowed window may not receive the same treatment, so contact the FTB as soon as you know the scheduled withdrawal will be unaffordable.
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Review penalty relief separately
After filing and addressing the balance, check whether you qualify for reasonable-cause relief or the FTB’s one-time penalty abatement. Relief is discretionary or conditional; it is not triggered simply because you entered a payment plan.
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How late-payment charges affect an unpaid balance
Late-payment penalty for the 2025 return
The 2025 California return instructions describe a late-payment penalty of 5% of the unpaid tax plus one-half of 1% for each month or part of a month that the payment remains late. Those percentages apply to the 2025 return instructions and should not be carried to another tax year without checking that year’s booklet.
The same instructions state that reasonable cause for the late-payment penalty is presumed when at least 90% of the tax shown on the return was paid by the original April 15, 2026, due date. Meeting that payment level does not guarantee every charge disappears; it is a presumption used in evaluating reasonable cause.
Interest is separate
Interest is mandatory under the cited FTB instructions. A penalty waiver does not automatically remove interest, and the reasonable-cause provision described there does not waive it. Interest can therefore continue even when a taxpayer receives relief from a penalty or is making scheduled installment payments.
Late filing is a different problem
Paying part of the bill does not satisfy the filing requirement. If the return is not filed by October 15, 2026, a separate late-filing penalty and interest can apply. Conversely, filing the return on time does not make an unpaid balance penalty-free. Treat filing and payment as two tasks with different deadlines.
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Understanding Form FTB 3519 versus Form FTB 3567
Form FTB 3519: an extension payment
Use Form FTB 3519 when you are making an extension payment for a return that was originally due April 15 and you expect to file by the October 15 extended deadline. Estimate your total tax, subtract payments and credits already made, and send what you can. The form helps identify an extension-related payment; it does not extend the date on which the tax was legally due.
Form FTB 3567: an installment request
Use Form FTB 3567, or the corresponding online service, when the return has been filed or the balance is otherwise established and you need monthly payments. The FTB may require ongoing compliance with filing and payment obligations. The online individual-plan page lists a $34 setup fee added to the account as of September 24, 2025, and describes automatic monthly bank withdrawals.
Keep records of the application, approval terms, withdrawal dates, and bank account used. A rejected or incomplete application does not stop collection activity, so read the FTB response and contact the agency if the proposed terms are unaffordable.
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Reasonable-cause relief
FTB guidance describes relief when a taxpayer can show reasonable cause for failing to pay or file on time. The facts must explain why the failure occurred and why the taxpayer acted responsibly once the problem was known. The guidance cited here does not promise approval, and interest remains due under the applicable instructions.
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One-time penalty abatement
The FTB also describes a one-time abatement for eligible individuals. The conditions include being in filing compliance, not having previously received the same one-time relief, and either paying other outstanding liabilities in full or maintaining a current installment agreement. Because each condition matters, verify eligibility before relying on the abatement to reduce your account.
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Penalty relief is a request, not an automatic benefit. Continue paying and following any plan while the FTB reviews the request unless the agency gives different written instructions.
Decision guide for common California taxpayer situations
You can pay the full amount, but need more time to prepare the return
Use the automatic extension and file by October 15, 2026. Pay the tax by April 15, 2026, if you are dealing with the 2025 return. The extension is appropriate for filing preparation, not for delaying payment.
You cannot pay everything by April 15, but can pay part
Send the largest affordable payment by the payment deadline, identify the transaction correctly in Web Pay or on the applicable voucher, and file by October 15. Then request monthly payments for the remaining balance if you cannot clear it promptly.
You did not pay or file by April 15
File as soon as possible; do not wait until you can pay in full. Pay what you can, then address the remaining balance through an installment request. Expect that late-payment charges and interest may apply, and check whether penalty-relief conditions fit your circumstances.
You are already making installments but the next withdrawal will fail
Review the due date in MyFTB and contact the FTB before the withdrawal. A possible skipped installment has the stated five-day and 30-day timing conditions. Even if granted, interest and penalties continue and the plan lasts longer.
Practical checklist before you submit anything
- Confirm that you are using the 2025 individual-return dates: April 15, 2026, for payment and October 15, 2026, for filing.
- Prepare and submit the return by the extended filing deadline, even if the account will show a balance due.
- Calculate the amount you can pay now and send it promptly.
- Choose the correct FTB payment type: extension payment, tax-return payment, or bill payment.
- Use Form FTB 3567 or the online service to request monthly payments for an established unpaid balance.
- Budget for the $34 online-plan setup fee listed in the September 24, 2025, terms, and verify the current fee before applying.
- Keep enough money in the designated bank account for automatic withdrawals and continue filing future returns on time.
- If a scheduled installment is unaffordable, check MyFTB immediately for the skip-request window.
- After the balance is addressed, evaluate reasonable-cause relief and one-time abatement requirements separately.
- Retain confirmations, payment records, plan notices, and correspondence with the FTB.
What this guidance does not cover
This article concerns California individual income tax. It is not guidance for federal IRS procedures, California business entities, payroll taxes, or another state’s return. Tax-year rules, fees, forms, and deadlines can change, so use the FTB instructions for the specific year and account involved.
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