Substantial Presence Test for Foreign LLC Owners (2025-2026)
Treaty benefit source hierarchy
How to support a treaty position back to primary sources.
Treaty article
The specific U.S. income-tax treaty provision you rely on.
Internal Revenue Code
How U.S. law interacts with the treaty position.
Treasury regulations & guidance
How the IRS interprets and applies the rule.
Disclose on Form 8833
Report a treaty-based return position when required.
Key Takeaways
- The substantial presence test is a strict day-count rule.
- Partial assumptions about transit or exempt days can be costly.
- Form 8843 or Form 8840 may matter depending on the facts.
- Model your U.S. days before you cross the thresholds.
The test is mathematical before it is emotional
The IRS substantial presence test looks at actual U.S. day counts over a three-year formula. To meet the test, the individual must be present at least 31 days in the current year and reach 183 days under the weighted three-year calculation.
This is why 'I am just traveling a lot' is not a useful answer. The calendar has to be counted.
Some days do not count, but you must prove it
The IRS explains that certain days can be excluded, such as certain transit days, exempt-individual days, and some medical-condition days. But those exclusions are not automatic. Forms like Form 8843 can become important if you want excluded days respected.
Digital nomads should avoid assuming that every partial or transit day is automatically harmless.
What to do if you are getting close
Start modeling the day count before you cross it, not after. If you may still qualify for the closer-connection exception, review Form 8840 timing carefully. If a treaty-based position may be needed, review Form 8833 as well.
The earlier the count is reviewed, the more options you usually have.
Frequently Asked Questions
What are the main thresholds in the substantial presence test?
The IRS says you generally must be present at least 31 days in the current year and reach 183 days under the weighted three-year formula.
If I was in the U.S. only part of a day, does it count?
Usually yes. The IRS generally treats you as present on any day you are physically in the U.S. at any time during the day, subject to specific exceptions.
Can I still be treated as a nonresident after meeting the test?
Potentially yes, through the closer-connection exception or a treaty position if you qualify.
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