Catenus
Residency Days
Track your 183 days in each state and country.
Residency Days logs where you are each day in the background. It warns you before you reach a residency threshold and exports a day-by-day PDF your CPA can check.
On the App Store as "Tax Residency Tracker 183 Days".
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Automatic day logging
The app logs your days in the background from low-power location updates, so you don't have to open it. Locations are matched on your device and never leave it.
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The rule for each place
Each place has its own rule. The app covers the 183-day state tests, New York's 184-day test and New York City's own, California's watch line, the IRS Substantial Presence Test and Schengen's 90 days in 180.
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Alerts at 30, 14 and 7 days
You get alerts 30, 14 and 7 days before you reach a threshold, while you can still change your plans, and one more when you cross it.
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PDF report for your CPA
The report lists every day, how it was recorded and which version of each rule was applied, so your CPA can check each count.
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Past days from your photos
The app reads the date and location of your photos and suggests where you were on past days. Your photos never leave your device, and those days stay marked as assumed until you confirm them.
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No account
The app keeps your record on your device. Backups are encrypted with a passphrase, and you can export everything to CSV.
Residency Days is for people who moved states and kept ties to the old one, snowbirds who split the year between states, people who work across state lines, and expats and nomads counting IRS or Schengen days.
Questions
How do I track 183 days for state residency?
Residency Days records which state or country you are in each day, automatically or by manual entry, and keeps a running count against each place's rule. It warns you 30, 14 and 7 days before you reach the limit.
Does it track the Schengen 90/180 rule and the IRS Substantial Presence Test?
Yes. Both are built in, next to the US state 183-day tests, New York's 184-day test and New York City's, and California's watch line.
Can I add days from last year?
Yes. The app can estimate past days from the dates and locations of your photos, read on your device. Each estimated day is marked as assumed until you confirm it, and you can also enter days by hand.
What does the PDF report include?
A day-by-day log of where you were, how each day was recorded (location, photo or manual entry) and the rule version used for each count.
Get Residency Days on the App Store
Privacy, terms and support
Residency Days tracks days. It is not tax advice; talk to a tax professional about your residency.