Residency
Before you book
See what a trip adds
Plan a trip in Residency and it shows the days it adds toward the test before you pay for the flight.
Residency Tax residency Substantial presence test
Substantial presence test calculator
The IRS counts this year in full, a third of last year and a sixth of the year before. Enter your days to see the total.
Weighted total
180
Residency counts the days for you and warns before you cross.
How the test works
You meet the substantial presence test if you were in the United States for at least 31 days this year and your weighted total over three years reaches 183: every day this year, one third of the days last year, and one sixth of the days the year before.
It is not the whole answer
Exceptions and treaty tie-breakers can change the result, and some days do not count. Use the number as a warning light, and take the decision to a tax adviser.
Questions
What is the substantial presence test?
An IRS day-count test for US tax residency. You meet it with at least 31 days in the United States this year and a weighted three-year total of 183 or more.
How are the three years weighted?
Days this year count in full, days last year count as one third, and days the year before count as one sixth.
What are you counting for?
Best passportDual citizen? See which passport gets you longer.
Schengen calculatorCount your 90/180 days across several trips.
VisasStay inside Schengen and visitor visa limits.
Tax residencyBecome resident, or stay non-resident, on purpose.
CitizenshipPhysical presence toward citizenship or permanent residence.
Plan a tripSee what a trip does to your limits before you book.
Trip historyEvery country visit, rebuilt from your photos.
DocumentsPassports, permits and visas with expiry alerts.
Visa-free stays by passportHow long you can stay, by passport and destination.
A day counter for people who move countries
Residency is on the App Store, for iPhone.