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Form 4868 instructions: how to fill it out (plain English)

Form 4868 is the IRS application for an automatic extension of time to file a personal income tax return — Form 1040, 1040-SR, 1040-NR, or 1040-SS. Anyone who files one of those can use it, including sole proprietors and single-member LLC owners whose business income lands on Schedule C. For the 2027 filing season (tax year 2026 returns) it is due by and moves the filing deadline to . The form has nine fields; below is what each one asks, and how to file it free.

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Form 4868 extends the time to file, not the time to pay. Tax you owe is still due ; interest and the failure-to-pay penalty run from that date on any unpaid balance. See the penalties guide.

When is Form 4868 due?

Form 4868 is due on the original due date of your return: for the 2027 season. The extension runs to . Qualifying U.S. citizens and resident aliens who are out of the country receive an automatic two-month extension to to file their return and pay the tax due, without filing Form 4868. Interest nevertheless runs from on unpaid tax. If they need additional filing time, they may file Form 4868 by for an additional four months, generally to . A Form 4868 filed after the deadline is generally not accepted.

All 2027 extension deadlines →

What is Part I of Form 4868 asking?

Part I asks who you are: your name and address, your Social Security number, and your spouse's Social Security number if you will file jointly. The details that matter:

  • Name(s). Exactly as it appears on your Social Security card. For a joint return, enter both names in the order they will appear on the return, and list the Social Security numbers in that same order.
  • Name change. If your name changed through marriage or divorce, report it to the Social Security Administration first; otherwise the name and number will not match SSA records and the extension is rejected.
  • Address. Your current mailing address. A new address on Form 4868 alone does not update your IRS record; file Form 8822 for that.
  • Social Security numbers. Yours, and your spouse's only if you will file jointly. Spouses filing separately each file their own Form 4868.

What is Part II asking?

Part II asks what you expect to owe, what you have already paid, and whether either of two special situations applies. Field by field:

  • Estimate of total tax liability. The total tax you expect your 2026 return to show — income tax plus self-employment tax and any other taxes, after nonrefundable credits.
  • Total payments. Federal income tax withheld, estimated tax payments you made during the year, and any refundable credits you expect to claim.
  • Balance due. Total tax minus total payments; enter 0 if payments exceed tax.
  • Amount you are paying. Enter how much you are paying with the extension — all of the estimated balance, part of it, or nothing. Full payment is not required to obtain the filing extension, but you must properly estimate your tax liability and timely file Form 4868. Interest and potentially penalties apply to unpaid tax.
  • Out-of-the-country box. Check it if you are a U.S. citizen or resident living and working outside the United States and Puerto Rico, or on military duty outside the country, and you are using the two-month automatic extension described above.
  • Form 1040-NR box. Check it if you file Form 1040-NR as a nonresident alien and did not receive wages subject to U.S. income tax withholding. Those filers have a later original due date, and the six months run from it.

There is no signature line.

What if I can't estimate my tax?

Use the information reasonably available to make your estimate as accurate as you can. Include the income, deductions, credits, withholding, estimated tax payments, and other tax items you reasonably expect to report on the return. The estimate does not have to equal the final liability, but it must be reasonable based on the information available when Form 4868 is filed. If the IRS later decides the estimate was not reasonable, it can treat the extension as null and void, which means your return was late all along. Enter zero only if, after making a reasonable estimate using the information available, you expect your total tax liability to be zero.

How do I pay with the extension?

Pay online through IRS Direct Pay, EFTPS, or a debit or credit card and choose "extension" as the reason; that payment by itself counts as filing Form 4868, so you do not send the form at all. Keep the confirmation number. If you mail a paper Form 4868 instead, enclose a check or money order payable to "United States Treasury" with your Social Security number, daytime phone number, and "2026 Form 4868" written on it; there is no separate payment voucher. For the period covered by the automatic filing extension, the IRS generally treats the taxpayer as having reasonable cause for late payment if at least 90% of the total tax is paid by the regular due date through withholding, estimated tax payments, or an extension payment, and the remaining balance is paid with the return. Interest still accrues on unpaid tax from the regular payment deadline.

Do both spouses need their own Form 4868?

No — one joint Form 4868 listing both names and both Social Security numbers covers both spouses. If you file jointly for the extension but later file separate returns, the payment made with it can be claimed on either return or split between them in any amounts you agree on. If each spouse filed a separate Form 4868 and you then file jointly, add both payments together on the joint return. Spouses who plan to file separately from the start each file their own Form 4868.

Does Form 4868 extend anything else?

It extends your gift tax return but not your IRA contribution deadline. Specifically:

  • Gift and generation-skipping transfer tax returns (Forms 709 and 709-NA): yes. An extension of time granted for the taxpayer's calendar-year individual income tax return also automatically extends the time to file the corresponding Form 709 or 709-NA. It does not extend the time to pay gift or GST tax.
  • Traditional and Roth IRA contributions: no. Contributions for 2026 must be made by , extension or not.
  • SEP-IRA employer contributions: yes. A self-employed person can fund a SEP for 2026 up to the extended due date.
  • Estimated tax payments: no. Form 4868 does not extend federal estimated-tax payment deadlines. State extension rules vary — some states recognize a federal extension, while others require a separate state filing, payment, or both.

Why do Form 4868 extensions get rejected?

The most common reason is a name and Social Security number that do not match Social Security Administration records. The usual causes:

  • Name and SSN mismatch. A married or hyphenated name never reported to the SSA, a typo in the number, or a spouse's name entered under the wrong number.
  • Duplicate filing. A Form 4868 for a Social Security number that already has an accepted extension or return for the year.
  • Filed after the deadline. There is no late extension.

You do not need last year's adjusted gross income or a self-select PIN to file Form 4868 through an Authorized IRS e-file Provider; those identity checks are for signing a return, not an extension. If a timely e-filed Form 4868 is rejected, the IRS provides a five-day transmission perfection period to correct and retransmit the extension. When the corrected extension is accepted within that period, it can retain the timeliness of the original transmission.

How do I file Form 4868 for free?

The IRS gives you two free ways, both online. Use IRS Free File to request the automatic extension electronically; there is no income limit for extensions. Or pay what you owe online and choose "extension" as the reason: that payment counts as filing Form 4868, so you do not send the form, and you get a confirmation number to keep. Either way, file by .

This season we're focusing on business and nonprofit extensions — Form 7004 and Form 8868 — so we aren't filing Form 4868. The IRS's free options above are how to get your personal extension.

Form 4868 FAQ

How long is the Form 4868 extension?

Six months. For the 2027 season a return due Thursday, April 15, 2027 is extended to Friday, October 15, 2027.

Does Form 4868 give me more time to pay?

No. It extends the filing deadline only. Tax you owe is still due April 15, 2027, and interest plus the failure-to-pay penalty accrue from that date on anything unpaid.

Do I need to file Form 4868 if I am getting a refund?

The failure-to-file penalty is a percentage of unpaid tax, so a return with no balance due carries no penalty for filing late. Filing Form 4868 is still the safe choice: it protects you if the refund turns into a balance once the return is finished.

Can I file Form 4868 for free?

Yes. IRS Free File lets anyone e-file Form 4868 at no cost, and paying any amount online with "extension" as the reason files the extension without a form. A paid service is for having the form prepared, filed, and confirmed for you.

Does Form 4868 cover my sole proprietorship or single-member LLC?

Yes, when the business is reported as part of the individual owner's Form 1040. A sole proprietorship generally reports business activity on Schedule C, while a disregarded single-member LLC may report its activity on the applicable schedule of the owner's return, such as Schedule C, E, or F. Extending the owner's Form 1040 therefore extends the filing deadline for that activity as well. Multi-member LLCs, partnerships, and corporations use Form 7004 instead.

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