Can a tax residency calculator determine my status?

Tax-residency calculators are most useful when they reduce the administrative part of the problem: keeping dates in order, applying a visible threshold and making a near-limit jurisdiction hard to ignore. They become misleading when they present a simple result as a final residence decision.

Use a calculator for the record first

Start with a complete timeline of where you were and the period the relevant country uses. A good record gives you something to check against official guidance and something to share with an adviser when a question becomes important. It also makes missing days and conflicting evidence easier to spot.

Know the rules a simple tool cannot model

The IRS substantial-presence test uses a weighted multi-year formula and exceptions — the free substantial presence test calculator works that arithmetic, including exempt student and teacher years, in your browser. The UK Statutory Residence Test includes several tests and can depend on ties as well as days. Other countries use their own frameworks. Treat a generic threshold as a review signal, not a conclusion.

How Flags helps

Flags: Country Days Tracker is designed as a private early-warning day record. It uses photo metadata and manual confirmation to help you review travel history, but it does not calculate full treaty, exception or legal-residence outcomes. Use it alongside current official guidance and qualified advice.