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 – 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.
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.
