Residency Days: Tax Tracker

Winters in Florida, summers in New York? One miscounted day past 183 can make you a tax resident you didn't choose. Residency Days counts every day — and proves it.

States now run automated residency reviews, and the letters go out by the hundreds of thousands. When one arrives, the question is not what you remember — it is what you can show.

IT KEEPS THE RECORD BY ITSELF
Turn on automatic tracking and the app logs the days you spend in each place in the background. Locations are matched on your device and never leave it. No daily check-in, nothing to reconstruct later — and a record kept as it happens carries more weight than a calendar filled in from memory.

EVIDENCE, NOT JUST NUMBERS
Export an audit-ready PDF for your CPA or a state residency review: the day-by-day log, how each day was recorded — logged automatically, marked by hand, confirmed from a photo — plus the rule methodology and its version. If a state ever asks where you were, you answer in one attachment.

STATUTORY RULES, NOT A GENERIC COUNTER
Most day counters treat every border the same. Residency Days ships the actual rules: the 183-day test for every US state, New York's 184-day statutory test (and New York City's own), California's watch-line, the IRS Substantial Presence Test with its weighted three-year formula and its 31-day current-year minimum, and the Schengen 90/180 rolling window. Each counter shows the methodology behind its number — one tap away, always.

BACKFILL A YEAR IN MINUTES
Point the app at your photo library and it rebuilds where you were, day by day, from photo locations — entirely on your device. Photos never leave your phone. Days filled in this way are marked as assumed until you confirm them: the record never claims more than it knows.

ALERTS BEFORE IT MATTERS
Threshold alerts at 30, 14 and 7 days out, and the moment a line is crossed. The counters and alerts stay right whether you track automatically or mark days yourself.

YOURS, PRIVATELY
No account. No servers. Your location history lives on your phone, protected by an encrypted backup only you can open, with CSV export whenever you want your data elsewhere.

WHO IT IS FOR
Anyone who moved states and kept ties to the old one. Snowbirds splitting the year between states. Professionals working across state lines. Expats and nomads watching the Substantial Presence Test or Schengen days.

SUBSCRIPTION
Annual $39.99/year with a 1-month free trial, or $6.99/month. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in App Store settings.

Residency Days is a day-tracking tool, not tax advice. For decisions about your residency, consult a tax professional.

Privacy Policy: https://catenus.app/privacy/residency-days
Terms of Use: https://catenus.app/terms/residency-days