U.S. taxpayers abroad get extra time to file—but not to pay. Here is what you need to know about expat tax deadlines:

Regular Deadline: April 15

Just like stateside taxpayers, expats must pay whatever tax is owed by April 15 to avoid interest and penalties, however they get an automatic extention to file their taxes, which is different than paying. Your tax due deadline is still April 15.

Automatic Extension to June 15

If you're abroad on April 15, you have an automatic 2-month extension to file (until June 15). However, as stated above, interest starts accruing on unpaid amounts as of April 15.

Optional Extension to October 15

You can request an additional extension by filing Form 4868. This gives you until October 15 to file your return, but once again—not to pay.

FBAR Deadline: April 15 (automatic extension to October 15)

If you have more than $10,000 in foreign financial accounts, you must file FinCEN Form 114 (FBAR). It's reported separately from your tax return and has its own deadline, though extensions are automatic.

Missing a deadline can bring steep penalties—especially for foreign account reporting. If you're unsure, consult a tax professional early in the season to keep yourself on track.