DayCount

Tax Residency Day Tracker

Count your days against the 183-day test — a day counter, not a residency determination.

Days present — this year

Days present — last year

Days present — year before

Weighted days (test count)

225

This counts days against the arithmetic of the US Substantial Presence Test only. It is not tax advice and does not determine your residency or tax status — exemptions, tie-breaker treaties, and closer-connection rules can all change the outcome. Consult a qualified tax professional.

Meets day-count threshold?: Yes
31-day minimum met?: Yes
Days over / under 183: +42

What you entered

Days present — this year: 150Days present — last year: 150Days present — year before: 150

1
Prior-year weighted days (÷ 3)
150 ÷ 3= 50 days
2
Year-before weighted days (÷ 6)
150 ÷ 6= 25 days
3
Weighted total
150 + 50 + 25= 225 days
4
31-day current-year minimum
150 ≥ 31 ?= Yes
5
Meets 183-day threshold?
225 ≥ 183 and 31-day minimum met= Yes (+42 days)

Result

Weighted days (test count): 225

Your weighted day count is 225, which meets the 183-day threshold (and the 31-day current-year minimum) by 42 days. Meeting the day count does not by itself make you a tax resident — exemptions and treaty tie-breakers may apply, so confirm with a professional.

The US substantial presence test at common day counts

The test counts every day in the current year, a third of the days in the prior year and a sixth of the days the year before that. Meeting it requires at least 31 days this year and a weighted total of at least 183.

Days this year	Prior year	Year before	Weighted total	Meets the test
90	90	90	135.0	No
120	120	120	180.0	No
31	300	300	181.0	No
183	0	0	183.0	Yes
180	30	30	195.0	Yes
100	180	180	190.0	Yes
150	100	100	200.0	Yes

The second and third rows are the ones that catch people: 120 days a year for three years looks modest and lands at 180.0, three days short - but a single extra visit tips it over. Conversely 31 days this year with heavy prior presence still fails, because the weighting discounts older years so steeply. The test is why frequent short trips can create US tax residency without any single year looking unusual. This models the arithmetic only. Exempt individuals such as students and certain visa holders, the closer connection exception, days you could not leave for medical reasons, and treaty tie-breaker provisions can all change the outcome, and other countries use entirely different rules. Confirm your position with a qualified adviser before relying on it.

A tax residency day tracker counts the days you have spent in a country and compares them against the day-count threshold that tax authorities use as one input to residency — most famously the United States' Substantial Presence Test. Physical presence is one of the most common triggers for tax residency worldwide, and because the counting rules are arithmetic rather than obvious, it is easy to cross a threshold without realizing it. This tool does the arithmetic clearly and flags where you stand, while deliberately stopping short of telling you that you are, or are not, a tax resident — a determination that depends on far more than a day count.

The US Substantial Presence Test is the model used here because it is precise and widely referenced. It does not simply ask whether you were present 183 days this year. Instead it weights three years: every day in the current year counts as a full day, each day in the prior year counts as one-third of a day, and each day in the year before that counts as one-sixth of a day. Those weighted figures are added together, and if the total reaches 183 days — and you were present at least 31 days in the current year — you meet the test's day-count threshold. The calculator shows each weighted contribution, the running total, both threshold checks, and how many days you are over or under, so the result is transparent rather than a black-box yes/no.

Two cautions are essential, and the source research is emphatic about them. First, meeting the day count is not the same as being a tax resident. Exemptions exist for certain visa categories (students, teachers, diplomats), the closer-connection exception can apply, and tax treaties contain tie-breaker rules that override a raw day count when two countries both claim you. Second, other jurisdictions use entirely different rules — a flat 183 days in a single year, split-year treatment, or tests based on your home, family, and economic ties rather than days at all. This tracker is therefore a planning aid: it tells you when you are approaching or crossing a day-count line that is worth taking to a qualified cross-border tax professional, not a substitute for that advice. Use it to stay aware of your position and to know when to get help — never as a residency conclusion in itself.

How the three-year weighting works

The Substantial Presence Test counts current-year days in full, prior-year days at one-third, and the year before at one-sixth. So 120 days a year for three years is 120 + 40 + 20 = 180 weighted days — just under the 183 threshold. Someone spending a steady four months a year in the US can sit right on the edge without ever being present half the year, which surprises many part-time visitors.

Meeting the count is not being a resident

Crossing 183 weighted days meets one arithmetic test, but exemptions (students, teachers, diplomats), the closer-connection exception, and treaty tie-breaker rules can all mean you are not treated as a US tax resident even if the days add up. This is why the tool reports a day count, not a status — the real determination requires a professional and the full facts.

Frequently asked questions

I was in the US 150 days this year, 150 last year, and 150 the year before — do I meet the test?

Yes, on the day count. It's 150 + 150/3 + 150/6 = 150 + 50 + 25 = 225 weighted days, well over the 183 threshold, and you clear the 31-day current-year minimum. But meeting the count isn't the same as being a tax resident — exemptions and treaty tie-breakers may still apply.

Why don't all my days count equally?

The Substantial Presence Test is designed to capture consistent presence over time, not just a single long stay. Weighting prior years less (÷3 and ÷6) means someone who visits regularly is assessed on their pattern, while a one-off long trip in a single year weighs most heavily in that year. It's arithmetic set by the IRS, not a judgment about intent.

Does meeting the 183-day count make me a US tax resident?

Not necessarily. It means you meet one threshold. You may still qualify for the closer-connection exception, be an exempt individual (certain visas), or be treated as a resident of another country under a tax treaty's tie-breaker rules. Only a qualified tax professional can determine your actual status — this tool just counts days.

Does this work for countries other than the US?

The weighting shown here is the US rule. Many countries use a simpler flat 183-days-in-one-year test, and others look at your permanent home, family, and economic ties instead of days. Use this as a US-focused day counter and check the specific rules — ideally with an advisor — for any other jurisdiction.