The Form 1040-NR filing deadline is either April 15 or June 15, and which one applies depends on how you earned your U.S. income. If you received wages subject to U.S. income tax withholding, or you maintained an office or place of business in the United States, your calendar-year return is due April 15, 2026. If neither applies, you have until June 15, 2026. Both dates fall on regular business days next year, so nothing shifts.
April 15 or June 15: Which Date Is Yours
The rule is written around two triggers. Wages subject to U.S. withholding pull you into the earlier deadline. So does having a U.S. office or place of business, even if you draw no wages from it. Meet either condition and your return is due the 15th day of the 4th month after your tax year ends.1Internal Revenue Service. Taxation of Nonresident Aliens
Miss both triggers and you get the 15th day of the 6th month. This later date typically fits nonresidents whose only U.S. income is passive: dividends, interest, capital gains, rental income.1Internal Revenue Service. Taxation of Nonresident Aliens
The business-presence piece catches people. A nonresident who runs a U.S.-based operation but pays themselves nothing still faces April 15. The IRS treats a business presence the same as withheld wages for scheduling purposes.
When either due date lands on a Saturday, Sunday, or legal holiday, the deadline moves to the next business day. For the 2025 tax year filed in 2026, April 15 is a Wednesday and June 15 is a Monday, so both stand.
Getting More Time With Form 4868
Form 4868 buys an automatic six-month extension, but you have to submit it by your original due date to avoid a late-filing penalty.2Internal Revenue Service. Form 4868 – Application for Automatic Extension of Time To File U.S. Individual Income Tax Return An April 15 filer moves to October 15. A June 15 filer moves to December 15.
Here is the part that costs people money every year. Form 4868 extends the time to file. It does not extend the time to pay. Any tax you owe is still due on the original April 15 or June 15 date, and interest and penalties run from that date if you underpay. When you send Form 4868, include a realistic estimate of what you owe and pay it.
What Happens If You File or Pay Late
Two separate penalties apply, and they can run at the same time.
Failure to File
If you owe tax and don’t file by the deadline (including any extension you properly requested), the penalty is 5% of the unpaid tax for each month or partial month the return is late, up to 25% total. Once the return is more than 60 days late, the minimum penalty is $525 or 100% of the tax due, whichever is less.3Internal Revenue Service. Failure to File Penalty
This penalty runs ten times harsher than the late-payment penalty. If you can’t pay in full, file anyway. When both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount, so the combined charge is 5% per month rather than 5.5%.
Failure to Pay
File on time but don’t pay everything you owe, and the penalty is 0.5% of the unpaid balance for each month or partial month it remains outstanding, capped at 25%.4Internal Revenue Service. Failure to Pay Penalty
Interest runs on top of both penalties from the original due date. The individual underpayment rate was 7% annualized in early 2026 and dropped to 6% starting April 1, 2026.5Internal Revenue Service. Quarterly Interest Rates Interest compounds daily, so the balance grows faster than the rate alone suggests.
Dual-Status Years Change the Deadline
If you were both a nonresident alien and a resident alien during the same tax year, which commonly happens in the year you arrive in or leave the country, your status on December 31 controls the deadline. Resident on December 31 means April 15. Nonresident on December 31 sends you back to the wage-withholding test to pick between April 15 and June 15.
A nonresident married to a U.S. citizen or resident alien can elect under Section 6013(g) to be treated as a U.S. resident for the whole year. Both spouses must agree. The election lets the couple file jointly on Form 1040 with an April 15 deadline and access joint filing rates. The cost is that the nonresident spouse’s worldwide income becomes subject to U.S. tax for the entire year, and the election continues into future years until terminated by divorce, revocation, death, or IRS action.6Office of the Law Revision Counsel. 26 USC 6013 – Joint Returns of Income Tax by Husband and Wife For a spouse with significant foreign income, the added tax exposure can outweigh the joint-filing benefit.
Form 8843 Has Its Own Deadline
If you qualify as an “exempt individual” for the substantial presence test (typically teachers, trainees, students, or professional athletes at charitable events), you must file Form 8843 to document that status, even if you earned no U.S. income.7Internal Revenue Service. Form 8843 – Statement for Exempt Individuals and Individuals With a Medical Condition
If you’re filing a 1040-NR, attach Form 8843 and send both by your filing deadline. If you had no U.S. income and no 1040-NR obligation, mail Form 8843 on its own by the date the 1040-NR would have been due, to the Department of the Treasury, Internal Revenue Service Center, Austin, TX 73301-0215. Each person must mail their own; family members cannot share an envelope.7Internal Revenue Service. Form 8843 – Statement for Exempt Individuals and Individuals With a Medical Condition