A clever rabbit has three burrows, but where is it tax resident?

There is an old Chinese proverb:

“A clever rabbit has three burrows.”

The idea is simple: a wise rabbit never relies on a single escape route. If danger appears, it has options. It is a useful way of thinking about modern international mobility.

Today’s entrepreneurs, investors, and digital nomads increasingly have lives that span several countries. They may own a business in one jurisdiction, spend winters in another, and have family connections somewhere else entirely. But while flexibility can be a commercial advantage, tax residence is not something you can improvise.

Many people discover, often after receiving an enquiry notice from HMRC, that they have carefully planned where to live, but have not planned where they are tax resident.

The UK doesn’t tax passports, it taxes residence

One common misconception is that nationality determines tax liability. It doesn’t.

The UK taxes individuals primarily by reference to tax residence, determined under the Statutory Residence Test (“SRT”). Whether you are arriving in the UK or leaving it, your tax position depends on a mixture of day counting rules and connecting factors.

You can spend surprisingly few days in the UK and still be considered UK tax resident. Equally, you can spend a significant amount of time here without becoming tax resident. The answer depends on your circumstances.

Arriving in the UK

For those moving to the UK, tax residence often begins earlier than expected. Buying a house, relocating family, beginning full-time work, or establishing a settled pattern of living can all influence the analysis

Where the relevant conditions are met, split-year treatment may apply, so that the tax year is divided into a UK resident part and an overseas part.

Getting the arrival date wrong can have significant consequences:

• Overseas investment income may become taxable
• Foreign capital gains may fall within the UK tax net
• Reporting obligations can arise unexpectedly
• Planning opportunities available before arrival may disappear.

Good planning is almost always easier before crossing the border than afterwards.

Leaving the UK

Departing the UK isn’t simply a matter of booking a one-way ticket. Many people assume that once they have left, UK tax residence automatically ends. It doesn’t.

Continuing to own a home here, returning frequently for work, maintaining close family ties, or spending too many days in the UK can all keep someone within the UK residence rules.

Even where UK residence ends, there may still be ongoing UK tax obligations on UK property, employment income, or certain investment gains.

Some individuals also overlook temporary non-residence rules, which can bring certain gains or income back into charge if they return to the UK within a relatively short period.

Counting days isn’t enough

People often obsess over the “183-day rule.” In reality, that is only one part of the picture. The SRT looks at a wider range of factors, including:

• Where you work
• Where your family lives
• Whether you have accommodation available
• How much time you have spent in the UK historically
• How many connections you retain with the UK

Two individuals spending exactly the same number of days in the UK can have different residence positions and very different tax outcomes.

The challenge for mobile individuals

For internationally mobile individuals, tax residence has become one of the most important areas to manage.

Many successful business owners now have what might be described as the rabbit’s three burrows:

• Businesses operating internationally
• Homes in more than one country
• Families and investments spread across jurisdictions

The flexibility is attractive. The tax consequences are not always obvious. Without careful planning, it is possible to become tax resident in more than one country at the same time, creating complexity, potential double taxation and unexpected compliance obligations.
Fortunately, tax treaties often provide mechanisms for resolving dual residence, but relying on them after the event is rarely the best strategy.

Planning beats reacting

The most successful international families don’t simply count days. Instead, they:

• Understand where their tax residence begins and ends
• Plan major transactions before changing residence
• Keep clear travel records
• Review their position regularly as circumstances change

The clever rabbit didn’t build three burrows because it expected danger every day. It built them because optionality is valuable. The same principle applies to international tax planning.

Mobility creates opportunity but only if you understand the rules that determine where you really live for tax purposes. In today’s world, having more than one place to call home is increasingly common. Knowing which one the tax authorities regard as home is what really matters.