Many high-net-worth families now live globally mobile lives. This means moving between countries for education, lifestyle, or business reasons. While this mobility brings flexibility and freedom, it also exposes the families to tax residency risks. For family offices, even routine travel by family members may trigger unexpected tax exposure, enquiries, and long-term compliance challenges if residency is not carefully monitored and evidenced.
These challenges are due to changes in the global tax landscape. On the one hand, you have countries like the UAE and Singapore trying to attract HNW families, other countries are tightening their tax frameworks. The UK is one such example, having recently ended its domicile-based framework and shifted to a residency-based tax regime.
Without in-house expertise regarding tax residency, a family office faces the significant risk of tax audits and liabilities in any country where a family member spends considerable time.
Global mobility
Since today’s HNW families are moving more often, relying on manual processes and spreadsheets to track residency is too risky to withstand a tax audit. Not only is informal tracking unreliable, but it also introduces compliance blind spots. With family members scattered around the globe, their footprints create a complex web of exposure that family offices must oversee and manage.
For example, in one well-documented case, the defendant had to prove they were not a tax resident in Ireland for the period from 2002 to 2006. That’s a full four years where they needed to show both their physical presence outside the country and provide details about their income.
While proving non-residency over four years may seem excessive, tax authorities have the power to review tax affairs several years in the past. In the UK, if HMRC suspects accidental or careless errors, they may look back up to six years, and in cases of deliberate tax evasion, they can assess as far back as 20 years. Obviously, finding hard evidence for something that happened so long ago can be near impossible.
Local consequences
When a tax authority initiates an investigation, the family office must be prepared to defend the tax residency status of its family members. Responding to an enquiry is often time-consuming and daunting. Moreover, the resources required to gather evidence, combined with potential legal fees and tax penalties, far outweigh the effort needed to implement a systematic tracking solution beforehand.
For example, this one case took over ten years to resolve, dating from 2015 to a 2025 court decision. The argument revolved around just 5 days a person spent in the UK. This led to a long legal battle about whether those extra days qualified as “exceptional circumstances” for UK tax residency.
Furthermore, the potential financial costs were quite substantial. The tax authority (HMRC) demanded over £3 million in unpaid taxes. And because the defendant didn’t keep detailed, current records, they had to go through three levels of court to try to prove that the extra time spent in the country should count as “exceptional circumstances.”
Tech solution
As complex as dealing with the tax authorities can be, family offices can minimise the burden by adopting specialised technology. One such service provider offering relief is Daysium’s platform, which helps family offices simplify global tax compliance and automate record-keeping.
The platform functions on two levels: prevention and defence. In terms of prevention, Daysium’s day-counting feature provides proactive alerts on potential residency triggers before a liability is incurred. In other words, unlike our previous case, a family member will know in advance whether they risk triggering tax exposure by overstaying a day or two at a specific location.
Then, in terms of defence, the Daysium platform automatically captures the user’s location data, which is then cross-referenced with specific tax jurisdictions. In addition, users can add their own records, such as geotagged and timestamped photos, boarding passes, etc. It’s able to capture robust, defensible evidence designed to withstand regulatory scrutiny.
All in a day’s work
Today, family offices face authorities that share information more frequently and require solid evidence for tax residency claims. As technology improves, they are becoming increasingly rigorous, leaving very little margin for error.
When a single action, something like overstaying in a country for just a few days, can unleash unexpected tax liabilities, family offices need to be more proactive. In this environment, technology platforms such as Daysium can help create a seamless, audit-ready trail of tax residency. Our technology provides family offices of all sizes with the clarity and confidence to master global tax challenges should any arise.
