Form 8843 — who must file it, and how
Form 8843 is how exempt individuals — chiefly F and J students, teachers and trainees — tell the IRS their US days should not count toward the substantial presence test. Who files, when, and what happens if you don't.
Days as an exempt individual do not count toward the substantial presence test — but only if you tell the IRS why. Form 8843 is that statement. It is not an income tax return, and owing no tax does not excuse you from it.
Who files
- Students on F, J, M or Q visas — generally exempt individuals for their first 5 calendar years in the US, as a lifetime total.
- Teachers and trainees on J or Q visas — generally exempt for 2 calendar years, subject to the IRS look-back rules.
- Their dependents in the same statuses — each family member files their own form.
- People who could not leave the US because of a medical condition, and certain professional athletes competing in charitable events.
Any part of a calendar year in the status counts as a whole year. To see what the exemption does to your day count, select the student or teacher option in the free substantial presence test calculator — it zeroes the exempt years out of the weighting and shows the working.
How and when to file
If you file a US tax return (Form 1040-NR), attach Form 8843 to it. If you have no return to file — the common case for a student with no US income — Form 8843 is mailed to the IRS on its own, by the deadline in the form's instructions for that year. One form per person, per year of exempt status.
The form itself is short: your visa status, the days you are excluding, and — for students and teachers — your institution or programme details. The current form and instructions are on the IRS Form 8843 page.
What happens if you don't file
Skipping the form can cost you the exclusion: the IRS can decline to treat your days as exempt, which drags them back into the substantial presence test and can make you a US tax resident for the year, with worldwide-income consequences. Filing late is generally better than not filing — the instructions cover how.
Keep the day record behind the form
Form 8843 asks for the days you are excluding, and a residency question years later — for example, when the 5-year student window runs out — turns on the same record. Count carefully, keep the evidence, and check your position each year as the exempt window closes.
How Flags helps
Flags: Country Days Tracker rebuilds your country days from photo metadata and manual confirmation, so the day record behind Form 8843 and the substantial presence test stays complete year over year.
Flags is an early-warning tool, not tax advice. Visa and exemption details vary — confirm your position with a qualified adviser or your institution's international office.
- Internal Revenue Service: About Form 8843 reviewed 2026-08-20
- Internal Revenue Service: Substantial presence test reviewed 2026-07-10
- Apple App Store: Flags: Country Days Tracker reviewed 2026-08-20
Flags rebuilds country day counts from photos you confirm and warns as you approach thresholds like the 183-day rule. It is not tax, legal or financial advice, and does not determine treaty positions or every jurisdiction-specific exception.
