How does the UK Statutory Residence Test work?

HMRC's RDR3 guidance sets out the automatic overseas tests, automatic UK tests and sufficient-ties test. The relevant threshold can depend on prior residence, work, days and ties such as family, accommodation, work and time spent in the UK. This is why the UK position cannot safely be reduced to a generic 183-day rule.

Why a simple count can mislead

Spending fewer than 183 days does not necessarily mean you are non-resident. The facts and sequence of tests matter, and split-year treatment or exceptional circumstances can add further detail. A count is important because the tests use days, but it is not an answer on its own. To see how your own days and ties interact, work through the free Statutory Residence Test calculator — it runs the three parts in order and shows the ties table live.

Start with the current HMRC guidance for the tax year in question. Do not assume that a threshold quoted for one person applies to another person with a different prior-residence history, work pattern or set of connections. Where the result affects a return or move, get advice based on the full facts.

If you also spend time in the US, remember its test is not the UK's: the US uses a weighted three-year calculation rather than a single tax year. See how the substantial presence test works if that applies to you, or run your numbers in the free substantial presence test calculator.

Keep evidence as well as totals

HMRC advises keeping records that help show days, travel, accommodation and work. A travel log is a useful input, but it does not replace the full analysis. Preserve the source records that explain a date, especially where a day could be disputed or an exceptional circumstance is relevant.

Review your history regularly rather than trying to reconstruct it after the tax year ends. Check arrival and departure dates, make a note of missing travel, and distinguish a confirmed stay from an estimate. The day-record review guide explains the recordkeeping side.

How Flags helps

Flags: Country Days Tracker can help you keep the private stay history behind a review. It can surface a potential UK issue, but it does not apply the complete SRT, assess sufficient ties, or make the final residency determination. Review the dates before acting on a warning.

See the app's limits before relying on it. Flags is an early-warning tool, not tax advice; confirm with a qualified adviser.