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 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.