How should I track days for tax residency?
A practical way to keep a day record for tax-residency questions while recognising that a day count alone is not a tax conclusion.
The useful part of a tracker is not a generic number. It is a travel record you can inspect by place and by the correct tax-year window before you need it.
Record the underlying days
Keep dates, places and supporting evidence. The UK's guidance, for example, asks people to keep records that help establish days and ties. Other countries can use different definitions and evidence.
Capture a day while it is easy to explain. Passport movements, tickets, accommodation, work records and a note about an unusual journey can all be more useful than trying to reconstruct the same period months later. A record should show the facts first; a threshold calculation comes after that.
Use the correct review window
Do not assume every country uses the calendar year or a single annual total. The US substantial-presence test uses a weighted three-year calculation, while the UK Statutory Residence Test has its own tax-year framework. Separate the places you need to review and check the current official rule for each one.
Treat thresholds as prompts
183 days is a common headline, not a global law. Some rules use different windows, lower thresholds or non-day ties. The United States substantial presence test uses weighted days across three years; the UK test includes automatic tests and ties.
A day total can tell you where to look first, but it cannot decide the relevance of a home, family, work, immigration status or treaty. If a result could affect tax filings or a move, ask a qualified adviser to apply the full facts.
How Flags helps
Flags: Tax Residency helps maintain a private day record from photo information and manual confirmation, then highlights potential thresholds for review. It is an early-warning tool, not tax advice. Read what Flags tracks, the 183-day rule and the relevant official guidance for your situation.
- Apple App Store: Flags: Tax Residency Tracker reviewed 2026-07-10
- HM Revenue & Customs: RDR3: Statutory Residence Test (SRT) notes reviewed 2026-07-10
- Internal Revenue Service: Substantial presence test reviewed 2026-07-10
Flags is an early-warning day tracker, not tax, legal or financial advice. It does not determine treaty positions or every jurisdiction-specific exception.
In this section
- What is the US substantial presence test?The IRS test uses at least 31 current-year days and a weighted 183-day total across three years, subject to exceptions.
- How does the UK Statutory Residence Test work?The UK Statutory Residence Test uses automatic overseas and UK tests, then a sufficient-ties test where relevant.
- What is the 183-day rule for tax residency?Why 183 days is a common threshold, not a universal tax-residency answer, and why records of days and ties matter.
- Does spending 183 days make me tax resident?A cautious explanation of why a 183-day total can be important without being a universal residency verdict.
- Can a tax residency calculator determine my status?What a tax-residency calculator can usefully do and why an app should be framed as an early warning rather than a legal determination.
- How should I track tax residency days?A practical recordkeeping approach for tax-residency day counts, with clear limits on what a tracker can decide.
- How are days counted for UK tax residency?Why UK tax residency cannot be reduced to a simple 183-day counter and what records help with a Statutory Residence Test review.