Leaving the UK in 2026: The Tax Checklist Nobody Gives You

The conversation about leaving the UK almost always starts in the wrong place. It starts with the destination: Dubai, Portugal, somewhere warm with lower rates. It rarely starts with the UK side of the equation, which is where the complexity actually sits.

Getting the departure wrong is not a hypothetical risk. HMRC has a detailed statutory test for who counts as UK tax resident. It runs on specific rules, and it does not care what visa you hold elsewhere or what your intentions are. It cares about days, ties, and whether you have actually severed the things that keep you connected.

This piece sets out the steps that matter, in the order they matter, for someone leaving the UK in the 2026/27 tax year or later.

The Statutory Residence Test: how it actually works

The Statutory Residence Test (SRT) has been the framework since April 2013, and it is the single most important piece of tax law for anyone leaving the country. It has three parts, tested in order.

The automatic overseas test is the simplest route to non-residence. You are automatically not UK resident if you spend fewer than 16 days in the UK during the tax year (or fewer than 46 days if you were not resident in any of the previous three years). This is the cleanest outcome and the one most advisers aim for in the first full year abroad.

The automatic UK test makes you resident if you spend 183 days or more in the country, or if the UK is your only home and you use it for a continuous period of at least 91 days.

The sufficient ties test is where almost everyone's real situation lands. If neither automatic test resolves your position, the answer depends on how many UK ties you maintain and how many days you spend here. The ties HMRC counts are: a family tie (spouse or minor children in the UK), an accommodation tie (somewhere available to you for more than 90 days), a work tie (40 or more days of UK work), a 90-day tie (spending 90 or more days in the UK in either of the two preceding years), and a country tie (being present in the UK at midnight on as many or more days as in any other single country).

The interaction between ties and days is not intuitive. With four or five ties, you become resident at just 16 days. With three ties, the threshold is 46 days. With two, it is 91. With one or zero, it is 121.

The number of days you can safely spend in the UK after leaving is determined entirely by how many ties you still hold. Cut the ties, and you buy yourself room. Keep them, and the day count shrinks fast.

This is why day-counting alone is dangerous. Keeping your family home, leaving a spouse behind, or working even a handful of UK days can drag you back into residence at a day count you thought was safe.

Split-year treatment

Most people do not leave on 6 April, which means the tax year of departure straddles two periods: the part when you were UK resident, and the part after you left.

The UK allows split-year treatment in defined circumstances. If you qualify, you are treated as resident for the UK portion and non-resident for the overseas portion, rather than being resident for the entire year. This is important because without it you could be taxable on worldwide income for the full year despite having genuinely relocated mid-year.

There are several cases under which split-year treatment can apply. The most common for departing individuals are Case 1 (starting full-time work overseas), Case 4 (ceasing to have a UK home), and Case 6 (the partner of someone who falls into Cases 1 through 5). Each has its own conditions, and qualifying for one is not automatic. You need to satisfy specific requirements about the overseas part of the year, and you need to get the claim right.

Split-year treatment is not something that happens to you. It is something you claim, and it requires that your facts fit one of the statutory cases. Get advice on this before you leave, not after.

Capital gains: the five-year claw-back

This is the provision that catches people who thought they had planned everything. If you become temporarily non-resident (broadly, non-resident for fewer than five full tax years) and you dispose of assets during that period, the gains can be taxed in the UK when you return.

The temporary non-residence rules under Section 10A TCGA 1992 mean that capital gains realised while you were abroad are brought back into charge if you resume UK residence within five complete tax years after the year of departure. The scope covers most gains that would have been taxable had you remained resident.

The practical consequence: if you leave the UK and sell a business, investment portfolio, or property within that window, and then return before five full tax years have passed, HMRC will treat those gains as if they arose in the year of your return.

For anyone leaving with significant assets, this means either planning to remain non-resident for at least five full tax years, or timing disposals carefully around the departure and understanding that the gains are at risk if plans change.

For those holding crypto specifically, the interaction between residency status and digital asset taxation adds another dimension. Toby and Heidi from CryptoTips walk through the mechanics of legally structuring around crypto taxes through residency changes in this companion video:

Notifying HMRC: the P85 and SA return

When you leave the UK, you should complete Form P85 (Leaving the UK), which notifies HMRC of your departure date, your overseas address, and any income you will continue to receive from UK sources. This is not optional administration. It is how HMRC updates your record and how your tax code gets adjusted. Failing to file it does not mean you are not tracked. It means HMRC's record of you is wrong, which creates problems later.

If you file Self Assessment, you will also need to complete a return for the year of departure, and potentially for subsequent years if you have UK-source income (rental income, for example, or UK employment income in the early part of the year). Leaving the UK does not automatically deregister you from Self Assessment.

National Insurance: voluntary contributions

UK National Insurance is separate from income tax, and leaving raises a specific question: do you want to keep paying voluntary Class 2 contributions to protect your State Pension entitlement?

You need 35 qualifying years for a full State Pension. If you are significantly short of that and still of working age, continuing voluntary contributions while abroad (currently around GBP 3.45 per week for Class 2) is one of the most efficient financial decisions available. The return on the contribution, measured against the pension income it secures, is exceptionally good.

You can normally pay voluntary contributions for up to six years of gaps, but the rules on eligibility while overseas depend on where you go and whether a social security agreement exists between the UK and your destination country.

Pension access abroad

Your UK pension does not disappear when you leave, but accessing it changes.

State Pension is payable worldwide, but it is only uprated annually (the triple lock) if you live in a country with which the UK has a relevant social security agreement. If you move to a country without one (Canada, for example, or most of the Caribbean), your State Pension is frozen at the rate it was when you left or when it was first claimed.

Private and workplace pensions remain accessible, and you can draw from them under normal rules. But if you transfer a UK pension overseas into a Qualifying Recognised Overseas Pension Scheme (QROPS), there are tax charges to be aware of, and the rules have tightened considerably. Any transfer to a QROPS outside the UK is subject to a 25 per cent overseas transfer charge unless both the pension and the individual are within the same country, or within the EEA.

SIPPs and ISAs behave differently. A SIPP can generally remain open and operational when you move abroad, but contributions may no longer be tax-relieved. ISAs cannot receive new contributions once you are non-UK resident, though existing ISA holdings can remain invested and continue to grow tax-free in the UK wrapper.

The domicile shift: what changed in April 2025

The 2024 Autumn Budget replaced the UK's long-standing remittance basis for non-domiciled individuals with a new foreign income and gains (FIG) regime from April 2025. This is a significant change for anyone who was previously non-dom and is now considering whether to leave.

Under the old rules, individuals who were UK resident but non-UK domiciled could elect not to be taxed on foreign income and gains unless they brought ("remitted") the funds to the UK. That regime no longer exists for new arrivals after April 2025, and it is being phased out for existing claimants.

The new regime offers a four-year exemption on foreign income and gains for individuals who become UK resident after a period of ten or more consecutive tax years of non-residence. After the four-year window closes, worldwide income and gains are taxable.

For people who have been in the UK on a non-dom basis and are now losing the remittance basis, the question of whether to leave has become more pressing. The FIG regime fundamentally changes the arithmetic for anyone whose wealth is structured around foreign income, and it is one of the main drivers of the current wave of departures.

What your bank actually does when you leave

This is the administrative layer that nobody warns you about, and it creates more frustration than any tax rule.

Banks vary widely. Some UK banks will allow you to keep a current account as a non-resident. Others will close your account once notified. Very few will let you open new products. If you have banking relationships that matter, check their non-resident policy before you leave, not after you get a letter.

ISAs cannot accept new contributions, as mentioned. But they can remain open and invested.

SIPPs generally continue to function, but some providers restrict access or charge differently for non-resident holders.

Mortgages may be called in or renegotiated. Lenders have varying policies on lending to non-residents, and some mortgage terms require you to be UK resident.

The practical advice is to treat the administrative side as a separate workstream. Make a list of every financial product you hold, contact each provider, and establish what changes when you leave. Doing this reactively, after you have gone, is significantly harder.

The actual sequence

This is the order that works, from roughly twelve months before departure through to the first full tax year abroad.

Twelve months out. Take professional advice on your SRT position: how many ties you will have, how many you can cut before departure, and what day-count that gives you. Model the split-year treatment cases. Review your capital gains position and decide whether any disposals should happen before or after departure.

Six months out. Contact banks, pension providers, mortgage lenders, and ISA providers to establish what will happen to each account. Begin the administrative process for your destination: visa applications, company formations, or whatever the route requires. If you are going to Dubai, that means the visa and Emirates ID process. If Portugal, the visa application and NHR/FIG regime registration.

On departure. File Form P85. Update your address with HMRC, your GP, your council (for council tax), and any remaining UK financial providers. Cancel your electoral roll registration if appropriate (this is a tie under the SRT, though it is not one of the five statutory ties).

First tax year abroad. Count your UK days carefully. Keep a log. Understand which ties remain and what day threshold that gives you. Do not assume 90 days is safe; if you have three or four ties, it is not. Complete your Self Assessment return for the year of departure and claim split-year treatment if applicable.

Years two through five. Remain aware of the temporary non-residence capital gains rules. If you dispose of significant assets, understand that a return to the UK within five full tax years can bring those gains back into charge. Consider voluntary NI contributions to protect State Pension entitlement.

Our tax comparison tool shows the headline rates, but the departure rules are where the real complexity sits. Getting the destination right matters. Getting the departure wrong can undo it entirely.

The short version

Leaving the UK is a tax event, not just a lifestyle change. The SRT is prescriptive, the ties test is unforgiving, and the administrative trail is longer than most people expect. Every piece of it is manageable with the right advice and the right sequence. The problems come from the assumption that moving abroad is enough on its own.

If you are weighing a move and want to understand how the departure side fits with the destination, our qualification review is the place to start. We deal with both halves of the equation.