Living abroad doesn't end your tax life. It complicates it.
Expat tax life is overlapping rules: your home-country residency, your new country's 183-day rule, the FEIE 330-day exclusion (Americans), and treaty tie-breakers when both countries claim you. Tax Days tracks every threshold and exports the records you'll need.
What you're up against
FEIE Physical Presence Test = exactly 330 days
Miss 330 by one day, lose the entire ~$130K exclusion. The IRS strict-liability counts every US-soil day, even layovers.
Your home country may still claim you
UK SRT, Canadian residential ties, Australian domicile, leaving home isn't automatic. Without methodically severing ties, you're still a tax resident.
New country's 183-day rule starts on arrival
Your new country's clock starts immediately. Most countries trigger residency at 183 days, but some (like the UAE) have lower thresholds with conditions.
Treaty tie-breakers require evidence
If two countries both claim you, the tax treaty's tie-breaker decides, based on permanent home, vital interests, habitual abode. Day counts feed every step.
What Tax Days does for you
Tracks home-country and new-country day counts simultaneously.
Runs the FEIE 330-day rolling 12-month window for Americans abroad, projects whether you'll meet it.
Handles the UK SRT (day count + ties + tax-year boundary), the Australian 183-day income-year test, the Canadian 183-day deemed-resident rule.
Tracks every country you visit during transit, Schengen 90/180, individual 183-day windows, all overlapping.
Notifies you 30, 14, 7, 3, and 1 days before you'd cross any threshold.
Exports per-country PDFs with day count, trip log, and rule evaluations. Treaty tie-breaker evidence in one click.
Stays on your iPhone. No servers, no accounts. Optional iCloud sync via encrypted CloudKit.
The rules you actually need to track
FEIE 330-day Physical Presence Test
Americans abroad: exclude up to ~$130K of foreign earned income, but only if you're outside the US for 330 days in a 12-month period.
Read the guide →UK Statutory Residence Test
Day-and-tie test on the UK tax year (6 April to 5 April). Critical for British expats and Americans visiting the UK.
Read the guide →Treaty tie-breaker rules
When two countries claim you, the tax treaty decides. Permanent home, vital interests, habitual abode, citizenship.
Read the guide →Substantial Presence Test (US)
Non-citizen visitors to the US: 3-year weighted day-count formula. Applies to non-American expats traveling to the US.
Read the guide →Closer-connection exception (Form 8840)
Even if you meet the SPT, you can stay non-resident with closer-connection, but only with a documented foreign tax home and under 183 current-year days.
Read the guide →Schengen 90/180
Non-EU citizens visiting Europe: 90 days max in any 180-day rolling window. Overstays trigger immigration consequences and tax-residency risk.
Read the guide →
Free guides and tools
- Guide
Expat day counter guide
The full playbook, picking a tax home, severance checklist, treaty tie-breakers, FEIE math.
- Calculator
Free Schengen 90/180 calculator
If your expat life passes through Europe, track Schengen days alongside your country residency.
- Calculator
Free SPT calculator
Non-citizen visiting the US? Run the IRS 3-year weighted formula in your browser.
- Guide
Records auditors actually accept
Contemporaneous vs. reconstructed records, and why the difference decides your tax position.
Common questions
Does moving abroad end my US tax obligations?
No. The US taxes its citizens and green-card holders on worldwide income wherever they live. Moving abroad changes which reliefs you can claim, like the Foreign Earned Income Exclusion or foreign tax credits, but the filing obligation itself stays.
How does the FEIE 330-day test work?
The Physical Presence Test requires 330 full days outside the US in any rolling 12-month period. The window doesn't have to match the calendar year, and partial travel days generally don't count as foreign days, so precise dates matter. Our FEIE calculator finds your best window.
Can my old state keep taxing me after I move abroad?
Some states make leaving hard: if you keep a home, driver's license, or other ties, they may argue you never gave up domicile. Cutting ties cleanly and keeping evidence of your move protects you from a state residency claim years later.
When do I become a tax resident of my new country?
Under that country's own rules, most commonly a 183-day test, sometimes paired with a home or center-of-life test. Check the rule page for your country and track your days from day one; the year you arrive is usually a split year with traps on both sides.
Built for the rules that follow you
FEIE, SRT, SPT, treaty tie-breakers, all in one app on your iPhone. $19.99/year. Less than what you'd pay for an hour of expat-tax advice.
