A flight out of Heathrow is not a tax plan. It is one event in a tax year containing homes, workdays, family ties, company decisions, investment transactions and the possibility of returning.
That distinction matters most when a founder is moving near a sale, dividend, option exercise or vesting event. The tax answer can depend on facts established months before and after the transaction, while the destination country may apply its own residence and source rules from a different date.
Twelve months before departure
Where time allows, the first planning meeting should happen before transaction documents or relocation commitments become irreversible. Start with a calendar for the current tax year and the two surrounding years. Record UK days, overseas days, workdays, homes, family location and prior residence history.
Alongside it, create an event list: share vesting, option deadlines, board meetings, dividends, secondary sales, earn-outs, trust distributions, pension decisions and property disposals. The purpose is not to move every event. It is to reveal which events might be sensitive to residence, source, treaty or temporary non-residence rules.
The destination analysis belongs on the same timeline. A person can become resident abroad before ceasing UK residence, or vice versa. Immigration permission, local registration and tax residence may have different effective dates.
The former UK non-dom regime ended on 6 April 2025 and the replacement rules are residence-based, as reflected in HMRC's current UK tax-residence collection. Old planning notes that assume the previous remittance-basis system deserve fresh review.
The Statutory Residence Test evidence file
The SRT has three broad stages: automatic overseas tests, automatic UK tests and, where neither settles the result, sufficient ties considered with day counts. Prior-year residence can affect which test applies.
Evidence should be contemporaneous. A travel app is useful but may not show midnight presence correctly, distinguish transit or prove where work happened. A stronger file can include passport and travel records, diaries, card transactions, phone-location history, accommodation documents, employment calendars, board minutes and school dates.
Workdays need particular attention. A short visit can contain a qualifying workday, and management activity can matter separately for a company. Personal residence, company residence and permanent-establishment questions should not be collapsed into one conclusion.
The output should state assumptions. If the result depends on selling a home, limiting UK workdays or keeping family outside the UK, that dependency should be visible and monitored rather than buried in an adviser memo.
Split year is not a universal switch
Split-year treatment is often described as if a tax year simply divides on the date of a move. It does not. The legislation contains specific cases for people leaving or arriving, and each case has conditions.
Even where a split year applies, the effect is not that every item before the date is UK-taxable and every item after it is outside UK tax. Source rules, anti-avoidance provisions, retained UK assets and the character of the payment still matter. The destination country may also tax from its own residence date and give relief under different rules.
A good planning note therefore names the split-year case, lists each condition, states the proposed split date and explains which transaction categories are not solved by the split.
Temporary non-residence and the return plan
Leaving can produce a non-resident period without permanently removing every UK consequence. HMRC's 2026 temporary non-residence guidance explains that certain gains and income realised while abroad can be taxed when a person returns and the statutory conditions are met.
This deserves attention before a sale or distribution, not when a return flight is booked years later. Prior UK residence, the length of non-residence, the type and timing of income or gain, and specific statutory provisions all matter.
Founders should also examine close-company distributions. HMRC publishes separate manual guidance on temporary non-residence and close-company distributions. The safe conclusion is not that every distribution is caught; it is that the category needs explicit review rather than a generic "paid after leaving" label.
Founder distributions, shares and liquidity events
A company event can contain several tax and legal clocks. There may be signing and completion dates, vesting, exercise, disposal, deferred consideration, earn-outs, escrow releases and restrictive covenants. Employment-related securities rules can ask where duties were performed over a period rather than only where someone lived on completion day.
Company residence and management also need their own workstream. A founder who relocates but continues making strategic decisions for a UK or overseas company can create questions for the company that are distinct from the founder's personal SRT result.
Before a transaction, advisers should reconcile the cap table, option documents, shareholder agreements, employment history, board process and expected cash path. For the personal side of a concentrated holding, read The Founder's Liquidity Trap.
UK property, pensions and accounts that remain
Non-residence is not a universal exemption from UK tax. UK rental income, employment duties, pensions and land can remain within UK rules. HMRC's guidance for non-residents disposing of UK property sets out reporting and payment considerations that can apply even when the seller lives abroad.
Banks, brokers and pension providers may also change product access after an address change. A move plan should identify which accounts can remain open, which investments can still be bought or serviced, and where emergency cash will sit while new accounts are established.
Wills, powers of attorney, insurance and succession documents should be reviewed across both countries. A technically successful residence change can leave a family operationally exposed if only one person understands the accounts or can access them.
The first ninety days after moving
The evidence file continues after departure. Complete local registrations, update banks and brokers honestly, retain proof of accommodation and work, and record travel back to the UK. Compare what actually happened with the assumptions in the pre-departure advice.
Create a short variance log. If a spouse remained in the UK longer than planned, a home was not sold, more UK workdays occurred or a transaction moved date, send that fact to advisers promptly. Residence planning fails quietly when a plan changes but the legal analysis does not.
Composite founder timeline
Consider a founder planning to move to Lisbon in September while a buyer is diligencing the company. The family intends to relocate together, but a child may finish the UK school term. The founder expects to attend monthly London board meetings and might receive a distribution before completion.
The SRT analysis needs actual days, workdays, homes and family ties. Split-year treatment needs a named statutory case. The distribution, share sale and any earn-out need separate categorisation. Portugal may establish residence under its own rules. A return within the temporary non-residence period could alter the UK result for specified items.
There is no responsible one-line tax answer to that scenario. There is, however, a manageable timeline of questions, owners, evidence and decision deadlines.
Questions for UK and destination advisers
- Which SRT test is expected to determine this year, and which facts could change it?
- Does a specific split-year case apply, and what does it not solve?
- Which planned income or gains require temporary non-residence analysis?
- How are shares, options, vesting, deferred consideration and distributions characterised?
- What remains UK-taxable or reportable after non-residence?
- When could the destination country claim residence or tax the same item?
- What evidence must be kept, and who monitors the plan against reality?
For the first-principles terminology behind the analysis, see Tax Residence, Domicile and Treaty Residence. For transactions specifically, see What To Do Before Selling a Company and Moving Country.
FAQ
Does leaving the UK automatically make someone non-resident?
No. UK residence is tested for the tax year under the Statutory Residence Test. The departure date is evidence, not the conclusion.
Does every departure qualify for split-year treatment?
No. Split-year treatment applies only when one of the statutory cases and all its conditions are met.
Can income or gains realised abroad be taxed after returning to the UK?
Potentially. The temporary non-residence rules can bring specified income or gains into charge on return when their conditions are met.
Content on Wealth Nomad is for general information and education only. It is not financial, investment, legal, tax, immigration, or accounting advice. Rules vary by jurisdiction and personal circumstances. Always speak to qualified advisers before making decisions.
