Checked against IRS Substantial Presence Test and Form 8843 sources on July 23, 2026.
The U.S. Substantial Presence Test starts with a strict day count. Some days may be excluded, but only in specific IRS categories. Form 8843 is the filing checkpoint for certain excluded-day claims, especially exempt-individual and medical-condition situations.
Short answer: Form 8843 does not make every U.S. day disappear. It is used to explain why days may be excluded because you were an exempt individual or could not leave the United States because of a qualifying medical condition or problem.
Jetseen helps you track days - always consult a qualified tax professional for advice specific to your situation.
Quick SPT recap
The IRS says the Substantial Presence Test requires both:
- at least 31 days of physical presence in the United States during the current year
- a weighted 183-day total across the current year and the two prior years
The weighted formula counts:
| Year | Days counted |
|---|---|
| Current year | All U.S. days |
| Prior year | One-third of U.S. days |
| Second prior year | One-sixth of U.S. days |
The IRS also says you are generally treated as present in the United States on any day you are physically present at any time during that day.
This guide is not another full SPT formula explainer. It focuses on excluded days and Form 8843.
Which days can be excluded from the SPT count?
The IRS Substantial Presence Test page lists several categories of days that are not counted for SPT:
| Category | Plain-English record to keep |
|---|---|
| Regular commuting from Canada or Mexico | Residence, work, and commute records |
| Under-24-hour transit between two non-U.S. places | Flight itinerary and timing |
| Crew-member days on a foreign vessel | Crew and vessel records |
| Medical-condition days | Intended departure and medical records |
| Exempt-individual days | Visa/status basis and Form 8843 records |
These categories are narrow. Do not treat "short trip," "temporary stay," or "I did not earn U.S. income" as an excluded-day category unless an IRS source supports it.
What is Form 8843?
The IRS About Form 8843 page says alien individuals file Form 8843 to explain the basis for excluding days of presence in the United States because they were exempt individuals or could not leave because of a medical condition or problem.
That means Form 8843 is tied to the reason you are excluding days.
It is not:
- a general SPT calculator
- a closer-connection claim
- a substitute for Form 8840
- a Jetseen export
- proof that all U.S. days are excluded
If your situation involves closer connection, treaty residence, filing status, or return deadlines, use the relevant IRS source and a qualified tax professional.
Does exempt individual mean exempt from U.S. tax?
No.
The IRS says "exempt individual" is an SPT term and does not refer to someone exempt from U.S. tax.
The IRS lists exempt-individual categories that can include:
| Category | Common source description |
|---|---|
| Foreign government-related individuals | Certain A or G visa statuses |
| Teachers or trainees | Certain J or Q visa statuses |
| Students | Certain F, J, M, or Q visa statuses |
| Professional athletes | Temporarily present for charitable sports events |
The details and time limits can be fact-specific. This guide does not decide whether a particular visa holder qualifies for excluded days.
Can illness exclude U.S. days from SPT?
Sometimes, but the source rules are narrow.
The 2025 Form 8843 says medical-condition days can be excluded for days when the person intended to leave the United States but could not leave because of a medical condition or problem that arose while in the United States.
The form instructions also say days cannot be excluded when:
- the person entered or returned to the United States for medical treatment
- the condition existed before arrival and the person knew about it
- the person was able to leave but stayed beyond a reasonable period to arrange departure
Do not turn this into a general travel-delay exception. If medical-condition days matter, keep the record with care and get tax advice.
What happens if Form 8843 is late?
The IRS Substantial Presence Test page says that if Form 8843 is not timely filed, the person cannot exclude those days unless they can show clear and convincing evidence that they took reasonable actions to become aware of the filing requirements and significant steps to comply.
This guide does not give filing deadlines for a specific tax year. Use the current form instructions and IRS pages for the applicable filing year.
The practical tracking point is to avoid reconstructing the file after the deadline has passed.
What should you track before professional review?
Build a clean record before deciding whether a day is excludable.
| Record | Why it helps |
|---|---|
| U.S. arrival and departure dates | Establishes actual presence |
| Visa or status basis | Supports exempt-individual review |
| Intended departure date | Matters for medical-condition claims |
| Medical records or physician statement | Supports medical-condition review |
| Transit itinerary | Supports under-24-hour transit review |
| Form 8843 copy and mailing or filing proof | Supports the filing record |
| Advisor notes | Keeps the tax conclusion separate from the trip log |
The record does not decide the answer by itself. It gives a professional the facts needed to review the answer.
Where Jetseen fits
Jetseen includes a built-in U.S. Substantial Presence tracker, trip records, notes, document attachments, and CSV export.
A practical setup:
- use the built-in U.S. SPT tracker for the main weighted count
- log every U.S. trip with exact arrival and departure dates
- add notes for potential excluded-day categories
- attach documents that explain the status or medical basis
- keep Form 8843 records outside the app as official filing documents
- export CSV records for your accountant or tax advisor
Jetseen does not decide whether a U.S. day is legally excludable, prepare Form 8843, file IRS forms, decide tax residence, or replace tax advice.
If U.S. days matter this year, Try Jetseen Free for 14 Days and keep the SPT count next to the records your advisor may need.
Jetseen helps you track days - always consult a qualified tax professional for advice specific to your situation.
FAQ
What is Form 8843 for?
The IRS says alien individuals file Form 8843 to explain the basis for excluding days because they were exempt individuals or could not leave the United States due to a medical condition or problem.
Does exempt individual mean I am exempt from U.S. tax?
No. The IRS says the term does not refer to someone exempt from U.S. tax. It is a term used for SPT day-count exclusions.
Can Jetseen mark excluded days for me?
Jetseen can help you keep the trip record, notes, documents, and CSV export. It does not decide whether days qualify for IRS exclusion.
Is Form 8843 the same as Form 8840?
No. This source pack supports Form 8843 for exempt-individual and medical-condition day exclusions. Form 8840 and closer connection need separate IRS source review.
Sources
- IRS: Substantial Presence Test
- IRS: About Form 8843
- IRS: 2025 Form 8843 PDF
Disclaimer: This article is for informational purposes only and does not constitute legal or tax advice. Tax residency rules change frequently. Consult a qualified tax professional for advice specific to your situation.