Key US tax deadlines for expats.

Last quarterly payment for the prior tax year. Required if you have non-withheld US-source income (rental, self-employment, K-1).

Employers and US payers must furnish W-2s and most 1099s to recipients by this date — keep an eye on your mailbox or US payroll portal.

Form 1120-S and Form 1065 are due. Most cross-border S-Corp owners file an extension via Form 7004 by this date.

The headline US filing date. Tax payments are due even if you extend the return — interest accrues from this date on any unpaid balance.

First quarterly payment for the current tax year for filers with non-withheld income.

Form 1120 is due (or extension via Form 7004). Same deadline as the individual return.

If your tax home and abode were both outside the US on 15 April, your filing deadline is automatically pushed to 15 June. No form required, but you still owe interest on unpaid tax from 15 April.

Second quarterly payment for the current year.

Third quarterly payment for the current tax year.

Final filing deadline for Form 1120-S and 1065 if you filed Form 7004 in March.

Last call for individual returns under Form 4868 extension. Missing this triggers late-filing penalties on top of interest.

FBAR has its own automatic extension that aligns with the October individual deadline. Don't miss this — penalties for unfiled FBARs are calculated on account balance, not unpaid tax.

Final filing deadline for Form 1120 if you extended.

Final date for tax-year-end actions: ROI elections, gift completions, IRA contributions, charitable donations.