Navigating the UK Statutory Residence Test (SRT) requires precision, particularly when assessing connections like the family tie. For internationally mobile individuals with children educated in the UK, school holidays present a significant risk. A seemingly innocuous extended stay during the summer break can inadvertently trigger UK tax residence.
This blog post provides a detailed analysis and a practical case study on how the family tie interacts with school holidays, the crucial “21-day rule”, and how voluntary holiday stays contrast with exceptional circumstances.
The Sufficient Ties Test: A Brief Overview
When an individual meets neither the automatic overseas tests nor the automatic UK tests, their residence status depends on the “sufficient ties test. This test balances the number of days spent in the UK against the number of connection ties the individual has retained.
For an individual who was resident in the UK in any of the three preceding tax years, the thresholds are notably strict.
Day Count and Required Ties (Previously Resident)
| Days Spent in the UK | Number of Ties Needed to be UK Resident |
|---|---|
| 16 to 45 days | At least 4 UK ties |
| 46 to 90 days | At least 3 UK ties |
| 91 to 120 days | At least 2 UK ties |
| Over 120 days | At least 1 UK tie |
If an individual spends between 46 and 90 days in the UK, maintaining three ties will make them UK resident.
The Family Tie and the “21-Day Rule”
An individual has a family tie if their spouse, civil partner, or minor child is resident in the UK. However, the legislation provides a specific carve-out for children attending full-time education in the UK.
An individual does not have a family tie with a child under the age of 18 in full-time UK education if that child would not be UK resident but for the time spent in education, and the child spends fewer than 21 days in the UK outside of term-time.
Crucially, “term-time” includes half-term breaks and inset days.
If the child spends 21 days or more in the UK outside of term-time, the exemption falls away, and the parent instantly acquires a family tie.
The Family Tie & School Holidays: A Case Study
To see this in action, consider the following 2026/27 scenario.
Background: Marcus relocated from London to Dubai in April 2025. He was UK resident for the 2024/25 tax year, meaning he is a “leaver” and subject to the stricter sufficient ties thresholds.
For the 2026/27 tax year, Marcus has the following UK ties:
- Accommodation Tie: He kept his London home and stays there when visiting.
- 90-Day Tie: He spent more than 90 days in the UK in the 2024/25 tax year.
His 14-year-old daughter, Chloe, boards at a UK school.
The Summer Holiday Dilemma: During the 2026/27 tax year, Marcus plans to spend 55 days in the UK. Because he falls into the 46-90 day band, he needs three ties to become UK resident. He already has two (Accommodation and 90-Day). The family tie is the deciding factor.
- Scenario A (Careful Planning): Chloe attends school during term-time. During the Easter and Christmas holidays, she flies to Dubai to be with Marcus. During the long summer holiday, she spends 18 days at a summer camp in the UK before flying to Dubai.
- Result: Because Chloe spent fewer than 21 days in the UK outside of term-time, the child education exemption applies. Marcus does not have a family tie. He only has two ties and is non-resident.
- Scenario B (The 21-Day Breach): Chloe attends school as usual. However, during the summer holiday, she spends 25 days touring the UK with friends before joining Marcus in Dubai.
- Result: Because Chloe spent 21 days or more in the UK outside of term-time, the exemption is lost. Marcus now has a family tie. Combined with his accommodation and 90-day ties, he has three ties. Spending 55 days in the UK makes him UK resident for 2026/27.
Contrast: Voluntary Holidays vs. Exceptional Circumstances
When managing day counts, it is vital to distinguish between voluntary holiday stays and forced presence. The SRT allows up to 60 days to be ignored for day-counting purposes if the individual is present due to exceptional circumstances beyond their control.
The recent Court of Appeal decision in A Taxpayer v The Commissioners for HMRC [2025] clarifies the boundaries of this relief. In that case, the taxpayer claimed exceptional circumstances because she had to travel to the UK to care for her alcoholic, suicidal twin sister and her neglected children.
The Upper Tribunal previously agreed that moral obligations to care for dependent minors in crisis could constitute exceptional circumstances preventing an individual from leaving. The Court of Appeal reinforced that sudden, life-threatening family crises satisfy the test:
“P would not be present in the UK at the end of that day but for exceptional circumstances beyond P’s control that prevent P from leaving the UK, and (b) P intends to leave the UK as soon as those circumstances permit.”
In stark contrast, overstaying a day allowance because a child’s voluntary summer holiday extended past 21 days does not qualify as an exceptional circumstance. Voluntary school holidays are entirely within the family’s control.
Consider reviewing the exact dates of the school’s published term-time, including inset days, to accurately calculate the remaining non-term days available to the child.
Join 5,000+ businesses comparing today