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US Substantial Presence Test calculator
The US taxes you as a resident if you meet the Substantial Presence Test: at least 31 days this year, and 183 days counting this year in full, one-third of last year, and one-sixth of the year before. This runs in your browser.
Weighted = this year + ⅓ last year + ⅙ year before. You're a resident for tax if that's ≥ 183 and this year is ≥ 31.
210 / 183
Meets the Substantial Presence Test
Weighted total210
Exempt individuals (certain visa holders), the closer-connection exception and treaties can change this. The test is a starting point, not tax advice.
FAQ
What days are excluded?
Days as an “exempt individual” (e.g. certain students and diplomats), days you commute from Canada/Mexico, and some medical-condition days don't count.
What is the closer-connection exception?
Even if you meet the test, you may avoid US residency if you're present under 183 days this year and have a closer connection to another country.