US tax return deadlines abroad: your calendar

For Americans living in Europe, there isn't one tax deadline but a whole calendar. The US return has three extensions that are either designed only for people abroad or only really useful to them. Your account reporting goes to a different agency and has its own extension. On top of that come US estimated payments and the deadlines of your tax authority at home, which follow entirely different rules. This page lays it all out side by side, with the dates for tax year 2026.

1Two calendars that know nothing about each other

The US taxes its citizens and green card holders wherever they live, and IRS Publication 54 states that the rules for filing and estimated payments abroad are basically the same as at home. Your country of residence taxes you as a resident at the same time. Both systems have their own deadlines, and neither follows the other.

In practice, that means your US return needs the tax you pay at home so it can be credited, and the assessment from your home tax authority often arrives later. If you know your deadlines, you can plan the order instead of chasing two deadlines at once at the end. The table shows the US deadlines for tax year 2026. If a deadline falls on a Saturday, Sunday or legal holiday, Publication 54 moves it to the next business day.

2April 15: the deadline for paying, not for you

The regular deadline for Form 1040 is April 15 of the following year. On that day, paying matters more than filing: tax you pay after April 15 accrues interest from April 15, even if you have an extension. Publication 54 says so explicitly for every one of the extensions.

So if you expect to owe tax, pay an estimate by April 15, even if your return will take months. If you expect a refund, or the credit for tax paid at home brings you to zero, you have more room. The law sets the cost of being late in percentages: for late filing, the IRS charges five percent of the unpaid tax for each month or part of a month, up to 25 percent; for late payment, 0.5 percent per month, also up to 25 percent. If both apply in the same month, the filing penalty is reduced by the payment penalty. With no unpaid tax, there is no percentage penalty, and that is exactly why paying before paperwork is the most important rule in the whole calendar.

3June 15: the automatic extension for Americans abroad

If you live outside the US, your deadline automatically moves two months later, to June 15. Regulation 26 CFR 1.6081-5 ties this to two conditions: you are a US citizen or US tax resident, and your tax home and your abode are, in a real and substantial sense, outside the US and Puerto Rico. Publication 54 puts it as living outside the US and having your main place of business or post of duty outside the US, both on the regular due date. If you happen to be visiting the US on that date, you do not lose the extension under the regulation.

You don't have to apply for anything. You simply attach a short statement to your return explaining why you are using the extension. On a joint return, it is enough if one spouse qualifies; on separate returns, the extension applies only to the spouse who qualifies.

Two consequences to know about. Interest still runs from April 15. The late payment penalty, however, is only charged from June 15 under this extension.

4October 15: Form 4868 and the checkbox

If June isn't enough, Form 4868 gets you another four months, to October 15. The six months count from April 15, not from June 15. You must file the request by the end of the automatic extension, so by June 15, and check the box on line 8 to show that you are a US citizen or resident living outside the US.

Unlike the June extension, this extra time is only an extension to file, not to pay. Form 4868 requires a careful estimate of your tax. If you can't pay it in full, you still get the extension, but interest runs on the unpaid amount and possibly a late payment penalty, which for Americans abroad starts on June 15.

If you live in the US or don't qualify for June, the standard version applies: Form 4868 by April 15, extending six months to October 15. According to Publication 54, there is no extension if you want the IRS to figure your tax or if a court has set the regular deadline for you.

5December 15: the extension by letter

Taxpayers outside the US have a third step that hardly anyone knows about. On top of the six months, you can ask the IRS for two more months, to December 15. This extension is at the IRS's discretion. You request it by letter stating your reasons and send it by October 15. You won't get a confirmation; the IRS only contacts you if it denies the request.

This step is meant for genuine exceptions, for example when the assessment from your country of residence is missing and the credit can't be calculated correctly without it. It isn't available if you already have an extension via Form 2350.

6Form 2350: more time for your first year abroad

If you moved to Europe partway through the year, you have a particular problem. The Foreign Earned Income Exclusion requires you to meet one of two tests: bona fide residence abroad for a full tax year, or 330 full days abroad within twelve consecutive months. Often you only know whether you meet either one after the filing deadline.

That is what Form 2350 is for. You file the request by your return's deadline, which for Americans abroad is usually June 15, and you generally get an extension until 30 days after the date you expect to meet the test. Publication 54 lists three conditions: you are a US citizen or resident, you expect to meet one of the tests but only after the filing deadline, and your tax home is abroad throughout the period. The IRS advises filing the request early, so that you can still file on time if it is denied.

Whether the exclusion is actually the better choice for your salary in Europe than crediting the tax you pay at home is covered in FEIE or Foreign Tax Credit.

7FBAR and the forms that come with it

7.1The FBAR goes to a different agency

The report of your accounts outside the US, FinCEN Form 114, is not an attachment to your tax return. You file it electronically through the BSA E-Filing System with the Financial Crimes Enforcement Network. It is due on April 15 for the previous year. If you miss that date, an automatic extension to October 15 applies; according to the IRS, you don't need to request it. You must file if your foreign accounts together exceeded $10,000 at any point during the year. Keep the records for five years from the due date.

Important: the June extension for the tax return does not apply to the FBAR. It has only its own calendar: April 15, and automatically October 15. Which accounts count and how to convert the amounts is covered in FBAR: reporting foreign accounts; what applies to missed years is in Catching up on FBARs and penalties.

7.2Forms that share the Form 1040 deadline

Form 8938 for foreign financial assets is attached to your return and filed by its deadline, including extensions. For Americans abroad the thresholds are higher than at home: for single filers, more than $200,000 at year end or more than $300,000 at any time during the year; for married couples filing jointly, more than $400,000 and $600,000. The same principle applies to Form 5471 if you hold shares in a foreign corporation or serve as an officer or director of one; see Your own foreign company as a US citizen. If you give up your citizenship or a long-term green card, your first Form 8854 is attached to the return for the year in which that takes effect.

7.3Form 3520 has its own deadlines

Form 3520 covers gifts and inheritances from abroad and relationships with foreign trusts. It is generally due on April 15. If you live outside the US on the due date, the deadline moves to June 15, provided you attach a statement; if you extend your income tax return, October 15 applies. The IRS instructions stress that this deadline is not tied to your income tax return, so the December extension does not apply to Form 3520. Learn more in Gifts and inheritances across the Atlantic.

8Estimated tax payments in the US

The rules for estimated payments are the same abroad as at home. Publication 54 gives the rule of thumb: if you expect to owe less than $1,000 for the year, or expect a refund, you generally don't need to make estimated payments. Many Americans in Europe end up there thanks to the credit for tax paid at home. If you have investment income, US rental income or a distribution from a US plan, you are often above it.

For tax year 2026, Form 1040-ES lists four due dates: April 15, June 15 and September 15, 2026, and January 15, 2027. You can skip the January payment if you file your 2026 return by February 1, 2027 and pay the balance with it. Income you plan to exclude under the Foreign Earned Income Exclusion is left out of your estimate; you calculate the tax on the rest at the rates that would apply without the exclusion.

9.3Switzerland

In Switzerland, the competent cantonal tax authority sets the deadline. Under Article 124 of the Federal Act on Direct Federal Taxation, it calls for returns by public notice, personal notification or by sending the form, and you must file even if you never received a form. If you don't hold a settlement permit and pay withholding tax on your salary, there is an extra deadline: under Article 89a you apply for a subsequent ordinary assessment by March 31 of the following year. It can pay off if you want to claim deductions that withholding tax doesn't take into account.

10The order: pay first, then claim the credit, then amend

Your US return credits the tax of your country of residence, but in many countries the return at home is due later, and the assessment comes after that. Publication 514 offers a solution many people overlook: you can claim foreign tax in the year it accrues rather than the year you pay it. You make this choice by checking the “Accrued” box on Form 1116 of an original return filed on time, not on an amended return, and it then applies to all later years.

If the tax you end up paying differs from the amount you claimed, the IRS generally requires an amended return on Form 1040-X with a new Form 1116. If the credited tax isn't paid within 24 months after the end of the year, you have to reduce the credit until you pay. Knowing both countries' deadlines lets you time your filings so that as few amendments as possible are needed.

A simple checklist works well for planning:

• By April 15: estimate last year's tax and pay any expected balance; file the FBAR once your list of accounts is complete.
• By June 15: file Form 1040 with the attached extension statement, or file Form 4868 with the box on line 8 checked; file Form 2350 if applicable.
• By October 15: the return and FBAR at the latest; if needed, a letter requesting the extension to December.
• At home: keep track of your local tax authority's deadline and the estimated payment dates.

11When deadlines have already passed

If you haven't filed for years, that's a different matter from a single missed deadline. For Americans abroad whose failure to comply was not willful, there are the Streamlined Foreign Offshore Procedures: under the IRS requirements, you file the returns for the last three years whose deadlines have passed, plus the FBARs for the last six years. According to the IRS, if you are eligible and meet all requirements, you face no failure-to-file or failure-to-pay penalties, no accuracy-related penalties, no information return penalties and no FBAR penalties. See how the procedure works in Streamlined Procedure: catching up on US taxes without penalties.

If you've missed just one deadline: file as soon as you can and pay any tax owed, because the percentages keep adding up every month. If you've received an IRS letter with a penalty, requesting penalty relief may make sense; see IRS letters and penalties. What to do around the October deadline is covered in our article October 15 deadline: tax return and FBAR. For an overview of all obligations for Americans in Europe, read the guide US tax obligations for Americans in Europe; the general deadlines for all US taxpayers are in US tax return deadlines.

In short

• If you're a US citizen living outside the US, the Form 1040 deadline automatically moves to June 15; interest still runs from April 15.
• Filing Form 4868 by June 15 gives you until October 15; by letter you can also request an extension to December 15.
• The FBAR is due April 15 and automatically extended to October 15; it is filed electronically with FinCEN, not with your tax return.
• Form 8938 and Form 5471 are attached to Form 1040 and share its deadline; Form 3520 has its own dates.

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