US expat tax deadlines 2026: which date is actually yours?
Four dates, and the one that applies depends on where you live, whether you extended, and whether you owe. The payment deadline is not one of the ones that moves.
US citizens and green card holders living abroad have four possible filing dates in 2026 — 15 April, 15 June, 15 October and 15 December — and which one is yours depends on where you live, whether you have filed for an extension, and whether you owe. The short version: your filing deadline is automatically 15 June if you live abroad, 15 October if you file Form 4868, and 15 December only if you write to the IRS before 15 October. Your payment deadline is 15 April in every one of those cases.
The four dates at a glance
| Deadline | Who it is for | What it needs |
|---|---|---|
| 15 April | Everyone. This is the payment date wherever you live and whichever extension you use | Pay the tax you expect to owe, so interest and the failure-to-pay penalty do not start |
| 15 June | Taxpayers whose tax home and main residence are both outside the US and Puerto Rico | Nothing — it is automatic. File the return, or file Form 4868 for longer |
| 15 October | Anyone who filed Form 4868 by 15 June abroad, or 15 April in the US | File the complete return, or post the discretionary-extension letter |
| 15 December | Taxpayers abroad who already hold the automatic extension and need longer | A letter to the IRS — there is no form — received by 15 October |
Why 15 April still matters if you are not filing until October
This is the detail that catches most people: an extension moves the filing date, not the payment date. Interest on an unpaid balance starts on 15 April 2026 and runs until the balance is paid, whether the return goes in during June, October or December. If you expect to owe, paying an estimate in April stops the interest clock even though the return itself is months away.
15 June: the automatic extension for living abroad
If your tax home and your main home were both outside the United States and Puerto Rico on 15 April 2026, you have an automatic two-month extension to 15 June. There is no form and no request. It applies to a teacher in Seoul, a missionary in Kenya and a remote employee in Lisbon alike.
What counts as living abroad for this
The test looks at two things: where your tax home is — generally your main place of business or employment — and where you actually live. If you are travelling but still keep a US residence and have not established a foreign tax home, the automatic extension may not reach you, and assuming it does means you were in fact late from 15 April. That distinction is worth settling rather than assuming.
15 October: the date almost everyone actually uses
Filing Form 4868 by your original deadline moves the filing date to 15 October 2026. It is the common deadline for Americans abroad, because foreign income statements, account records and foreign tax paperwork are frequently not available in April, or even in June.
Form 4868 is free and needs no explanation — it is a formality, not a request that can be turned down. For what else falls on that date, see theFBAR deadline guide: the FBAR follows its own filing track but lands on the same day.
15 December: the extension almost nobody knows about
There is a third extension for expats who already hold the automatic extension to 15 October, and unlike the first two it is not automatic and there is no form for it. You write the IRS a letter, and it has to arrive by 15 October.
The exact contents, the address and what rules you out are in the15 December extension guide. The short version: it buys two more months to file, not to pay, and you hear back only if the answer is no.
What happens if you miss all four
If 15 October — or your 15 December extension — passes with the return still unfiled, the position is usually less serious than it feels, but the arithmetic changes. The penalties, one by one, are set out in what actually happens if you miss the deadline. If the gap is years rather than weeks, the route is different again:catch-up filing under Streamlined.
Every one of these dates has an exception or a document requirement attached, and getting the wrong one wrong costs real money in interest and penalties. Afifteen-minute call settles which deadline is actually yours, and what it needs before it arrives.
Frequently asked questions
Do I get the June 15 extension automatically, or do I have to request it?
It is automatic if your tax home and your residence were both outside the US and Puerto Rico on 15 April 2026. Nothing is filed to claim it. If the IRS later disagrees that you qualified, you are treated as late from 15 April, so it is worth confirming rather than assuming.
If I file Form 4868, does that also extend my FBAR?
No action is needed either way. The FBAR already carries its own automatic extension to 15 October for everyone, with no form required. It is a separate filing, made to FinCEN rather than the IRS, and it follows its own rules even though the date matches.
Can I get an extension past December 15?
Not through a formal IRS extension. December 15 is the last discretionary extension available to an individual taxpayer abroad. After that you are in missed-deadline territory, which has its own options and is rarely the emergency it is assumed to be.
Does an extension increase my chances of an audit?
No. An extension is a routine, unflagged part of the system, and it is particularly common among expats who need time to gather foreign documentation. What matters for audit risk is accuracy on the return, not which date you filed by.
What if I owe money but cannot pay it all by April 15?
Pay what you can by 15 April to reduce the interest accruing on the balance, then handle the rest when you file. The IRS offers payment plans once the return is filed. The thing to avoid is letting a missed payment become a missed filing as well.
IRC §6072 and §6081; Treas. Reg. §1.6081-5; IRS Publication 54 (2025); IRS Form 4868 instructions; 31 CFR 1010.306. Dates are the 2026 filing season for tax year 2025. Checked 22 September 2026.
Talk to the person who signs the return.
Fifteen minutes, free, and you will know which deadline is yours and what it needs.