Start with ordinary end-of-day presence
Finance Act 2013 Schedule 45 ordinarily treats a day as spent in the UK when the person is present at the end of that day. HMRC describes this as the midnight rule. A daytime visit that ends before midnight is therefore not automatically an ordinary UK day, although the deeming rule may count some such visits later.
The statute also identifies a narrow transit case where a passenger arrives, leaves the next day, and undertakes no substantially unrelated activity between arrival and departure. Transit classification is factual, so a tool should not remove a day merely because an itinerary includes a connection or labels the traveller a passenger.
Exceptional circumstances are conditional adjustments
A day can be disregarded where exceptional circumstances beyond the person's control prevent departure, the person intends to leave as soon as circumstances permit, and the statutory conditions are met. HMRC's claim-level guidance lists the SRT provisions where this adjustment can be considered; it is not a universal subtraction from every work or residence test.
No more than 60 UK days in a tax year may be ignored for exceptional circumstances. HMRC expressly says that 60 is a limit, not an allowance or entitlement. Eligibility depends on what happened and why departure was prevented, so entering a requested number cannot establish that those days qualify.
Deeming has three prerequisites
HMRC says the deeming rule applies only if the person was UK resident in one or more of the previous 3 tax years, has at least 3 UK ties for the current year, and was present in the UK on more than 30 qualifying days without being present at the end of those days. All three prerequisites matter.
When they are met, qualifying days after the first 30 are added to the ordinary end-of-day count for relevant purposes. Deeming is not a user-selected bonus and the deemed days are not used to manufacture the 90-day tie needed to establish its own prerequisites. The ties themselves still require separate factual review.
Keep the third overseas channel separate
The third automatic overseas test contains a distinct limit of fewer than 91 UK days and expressly excludes days treated as UK days only by the deeming rule. HMRC likewise says the deeming rule does not apply to that limit. This no-deeming channel is separate from the ordinary adjusted total used elsewhere.
Exceptional-circumstance adjustments can be relevant to specified day thresholds, including this overseas-test limit, but do not erase UK workdays or solve full-time-work calculations automatically. Preserve ordinary midnight days, proposed exceptional days, qualifying daytime visits and the third-test no-deeming count as separate traceable quantities, then review transit and complex work facts outside the estimator.
- Ordinary channel: end-of-day presence, subject to statutory adjustments.
- Deeming channel: only qualifying visits after 30 when all prerequisites hold.
- Third overseas channel: fewer than 91 days without deemed-only additions.
Official sources
- HMRC — Meaning of a day spent in the UK
- HMRC — SRT deeming rule and prerequisites
- HMRC — Exceptional-circumstance day-count applications
- HMRC — Exceptional-circumstance limits across SRT tests
- Finance Act 2013 — Schedule 45 day-spent rules
Sources were checked on . Linked institutions may update their guidance after that date.