Navigating Tax Compliance Challenges: A Case Study of the UK’s Statutory Residence Test

In the complex world of tax compliance, the UK’s Statutory Residence Test (SRT) presents a significant challenge, particularly for globally mobile individuals. This case study explores the intricacies of the SRT and illustrates the tax compliance challenges individuals need to navigate to guarantee compliance. We’ll examine a specific case involving day counting and outline the key challenges you could overcome with Daysium’s innovative day counting solution.

Since its introduction in the 2013/14 tax year, the UK’s Statutory Residence Test (SRT) has become a cornerstone in determining an individual’s tax residence status. Key provisions of the SRT state:

“(1) A person is resident in the UK for a year if either the automatic residence test or the sufficient ties test is met.

(2) The automatic residence test requires a person to meet none of the automatic overseas tests, and at least one of the automatic UK tests (para 5).

(3) Many of the automatic overseas tests (paras 12, 13 and 14), and the automatic UK tests (paras 7 and 8) depend on the number of days the person spends in the UK.

(4) If the automatic residence test is not met, the “sufficient ties” test applies.

(5) Under the sufficient ties test, a person’s residence is determined by a combination of (a) the number of UK ties and (b) the number of days the person spends in the UK.

(6) The number of ties sufficient to make a person UK resident depends on (a) whether the person was resident in the UK for any of the previous three tax years, and (b) the number of days the person spends in the UK in the tax year in question (para 17(3)).

(7) The combinations of days spent in the UK and the number of ties are set out in Tables at paras 18 and 19.”

Day counting is essential to the tests, both for the automatic residence test and the sufficient ties test. Para 22 of SRT determines how many days a person spends in the UK.

Generally, a person is present in the UK for day-counting purposes if they are present at the end of a day.

The exceptions to the general rule are:

• • Transit Exception: A day does not count if the person only arrives in the UK as a passenger, leaves the next day, and engages only in transit-related activities.

• • Exceptional Circumstances Exception: A day does not count if the person would have left the UK but was unable to due to exceptional circumstances beyond their control, intending to leave as soon as possible. Exceptional circumstances might include emergencies like war, natural disasters, or severe health issues.

There are also limitations on the number of days a person can spend in the UK for exceptional circumstances each tax year, which are capped at 60 days.

However, the case we’ll discuss shows that what counts as ‘exceptional’ is ambiguous at best.

The Appellant in the case was a taxpayer who moved from the UK to Ireland on April 4, 2015. In her self-assessment tax return for the year 2015/16, she claimed non-UK residency.

HMRC challenged this decision because she had spent more than the permissible number of days in the UK, which led the taxpayer to appeal to the First-tier Tribunal (FTT).

Both the Appellant and the authorities agreed that the Appellant had spent 50 nights in the UK during the tax year. This was more than the 45-day limit set by SRT.

However, the issue became the exceptional circumstances clause, which allows some leeway in the day count. The test allows certain days to be disregarded in the SRT day count when a person (P):

“(a) 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.” 

The Appellant argued that her presence in the UK was beyond the allowed 45-day limit due to such exceptional circumstances. Her twin sister suffered from severe alcoholism and depression, which led to suicidal threats that forced her to be present in the UK for those extra five days. She further argued that she had a duty of care towards her sister’s young children and had to stay in the country for these additional days.

HMRC argued that her account wasn’t warranted by exceptional circumstances, and as such, she was to pay income tax in the UK as a tax resident. The additional tax due would amount to £3,142,550.58 — a considerable sum to pay.

First-tier Tribunal (FTT) Ruling (2022)

The FTT ruled in favour of the taxpayer, accepting that the six additional days were due to exceptional circumstances beyond her control. This decision effectively meant that she was not a UK tax resident for 2015/16.

Upper Tribunal (UT) Repeal (2023)

HMRC appealed the decision, and the Upper Tribunal (UT) overturned the FTT’s ruling, arguing that:

• Moral obligations do not qualify as exceptional circumstances — staying in the UK to care for a family member was not sufficient to trigger the exception.
• The FTT had failed to assess each disputed day individually as required by the law.

The taxpayer was therefore deemed a UK tax resident, making her liable for taxation on an £8 million dividend.

A Landmark Decision in the Court of Appeal (2024)

In February 2025, the Court of Appeal studied the case again. They overturned the Upper Tribunal’s ruling and reinstated the FTT’s original decision. The Court of Appeal clarified that:

• Moral obligations can qualify as exceptional circumstances if they create a compelling reason to remain in the UK.
• The Upper Tribunal had overstepped its authority — the FTT’s findings were factual, not purely legal, and should not have been overturned unless clearly irrational.
• The FTT had sufficient evidence to conclude that the taxpayer was genuinely prevented from leaving on those six days.

This ruling provides a precedent for future cases, offering more clarity on the scope of exceptional circumstances under the SRT.

The historic case highlights several important lessons on day counting and record-keeping to ensure tax compliance. 

Location accuracy matters

HMRC scrutinised whether the taxpayer’s presence in the UK was justified, questioning whether she could have left sooner or made alternative travel arrangements. Because of the lack of accuracy, the taxpayer’s presence wasn’t initially considered strong enough to showcase it was needed for the care of her family member. 

Proof of activity is essential

Credit card statements and financial transactions alone did not sufficiently demonstrate the nature of her presence in the UK. Without contemporaneous documentation detailing her activities, her claim of exceptional circumstances was initially challenged.

Lack of day counting framework

The Appellant admitted that her tax advisory team told her of the day count limits before the move. While advisors can advise to keep accurate records, most people rely on a traditional, manual method to do so. The issue with the ‘spreadsheet method’ is that they:

• Don’t keep accurate real-time records of your travel days.
• Don’t allow you to plan ahead. 

Tax investigations can last years

This case has been ongoing for nearly a decade, with the taxpayer living under uncertainty about her tax liability. The prolonged process highlights the importance of maintaining comprehensive, real-time records to preemptively strengthen residency claims and avoid lengthy disputes.

The case study has set precedents regarding exceptional circumstances with its twists and turns. The prolonged court cases also highlight the ambiguity in the world of tax compliance and the risks HNWIs need to navigate. 

As the challenges of accurate day counting and proof of exceptional circumstances emerge from this case, Daysium’s capabilities could offer substantial relief.

Daysium’s role as a tax compliance tool would:

• • Create evidence to prove location. Daysium automates evidence collection, logging your location data automatically into a timeline. You will have a centralised digital location record, and the system will update your day count in real time.

• • Attach proof of activity to your location data. Supplementary evidence, such as geo-tagged photographs and receipts, can strengthen your location logging and fortify the authenticity and reliability of your claim. In exceptional circumstances, you can generate a more substantial case by including additional notes to create a more compelling narrative of your day count.

• • Reduce enquiry times. The robust evidence you’ve generated can make the enquiry process smoother and faster. The data will help the tax advisory team to build a stronger case and deal with any enquiries by the authorities faster.

• • Stay aware of your day count. Real-time calculation of day count enables you to proactively manage your situation. The information isn’t inaccessible and hard to find—everything is available in the palm of your hand. Therefore, you can better plan and manage your day counting even in exceptional circumstances.

• • Count based on your individual situation. Daysium’s day counting is always personalised around your specific needs. We’ve encoded the SRT ruleset to our platform, amongst many other global tax rulesets, meaning your day counting is specific to you, and you can configure it if your situation changes.

Tax authorities worldwide are focusing on the tax affairs of globally mobile individuals. They are increasingly using sophisticated methods, including AI tools. Interpretation of the existing rules is putting many individuals under the microscope. At the same time, the length of enquiries is increasing, leading to longer and more complex processes. The prolonged investigations can be taxing, not just financially but also emotionally.

With Daysium’s platform, you can:

• • Enhance your compliance. The robust record-keeping capabilities enable you to navigate recency requirements precisely and confidently.

• • Reduce your risk of investigation. Improved compliance reduces the risk of time-consuming investigation. Real-time access to day counting and reports will help individuals identify potential issues immediately, guaranteeing that tax advisory teams can help improve compliance.

• • Strengthen your defence. The comprehensive data repository you’re creating will expedite the resolution process. You’ll save time and resources not only for yourself but also for the tax authorities. You can more confidently show what your day count is and what evidence you have to prove it, especially in exceptional circumstances.

In conclusion, as tax authorities globally enhance their scrutiny using sophisticated technologies, solving tax compliance challenges becomes increasingly complex. Daysium stands at the forefront of this landscape, offering a robust, innovative solution that ensures compliance and transforms it into a strategic advantage for globally mobile individuals. Your records are robust, and if you face an investigation, you can expedite the process by confidently saying, “There’s nothing to see here, everything is in order”.