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The UK tax year runs from 6 April to 5 April. If you leave partway through the tax year and meet the conditions, you can claim split-year treatment, which divides your tax year into two parts: the UK-resident part and the overseas part. During the overseas part, you only pay UK tax on UK-source income.
This relief is worth claiming because it can turn a year of UK taxation into a partial year, cutting your tax bill significantly. However, split-year relief is easy to get wrong, and HMRC denies many claims due to technical errors.
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To claim split-year treatment when leaving the UK, you must:
If these conditions are met, split-year treatment usually applies automatically. You claim it on your Self-Assessment return using the SA109 supplementary page.
Three main scenarios qualify:
Many expats miss this relief because they don't claim it on their return. Don't be one of them.
CGT planning before you leave is crucial because it determines what you pay tax on and when.
Pre-departure crystallisation: If you own investment assets (shares, unit trusts, investment bonds) with large unrealised gains, you have a choice: realise the gains before you become non-resident, or retain the assets and sell them later as a non-resident.
If you dispose of assets while UK-resident, you pay CGT at your resident rate (18% or 24%) but avoid the temporary non-residence (TNR) trap, which can catch you if you leave, sell abroad, and return within five years.
The TNR rule states: if you were UK-resident in four or more of the seven years before departure, and you leave for five years or less, gains on assets owned before departure (excluding UK land) may be taxable in the year you return to the UK.
The takeaway: if you know you will return within five years, crystallise gains before departure. If you know you will stay abroad for 5+ years, you may retain assets and sell them as a non-resident, avoiding the TNR trap.
UK residential property: Do not delay selling UK property. Non-residents pay CGT at 18%/24% on UK property gains, and you lose principal private residence relief on any appreciation that occurs while you are non-resident. You must report the sale and pay tax within 60 days of completion.
Your final UK tax year is a window for larger pension contributions. In the year you leave, you can contribute up to 100% of your relevant UK earnings and claim tax relief.
After you leave, that window closes. For the next five tax years, you can only contribute £3,600 gross per year (until 5 April 2031).
If you have flexibility, front-load contributions into your final UK year and use any unused annual allowance from prior years. This is one of the most powerful tax reliefs available to departing expats.
ISAs: If you hold an ISA before departure, plan whether to retain or cash it in. As a non-resident, future growth in an ISA may not receive UK tax-free treatment (rules vary by destination country). In some cases, cashing in the ISA before departure triggers no gain or loss and simplifies your offshore structure.
Investment bonds: These become complex as a non-resident due to chargeable event gains. If you hold an investment bond, discuss with your adviser whether to surrender it before departure or retain it, depending on your new country's tax position.
If you hold SEIS (Seed Enterprise Investment Scheme) or EIS (Enterprise Investment Scheme) shares, these come with reliefs and deferral relief that may be affected by your departure.
If you've held EIS shares for three years and have deferral relief, emigrating before the deferral period completes could trigger the deferred gain. Discuss your position with your adviser before you leave.
Before you leave, file your Self-Assessment return for the year of departure (including split-year claim if applicable) by 31 January following the tax year end. Do not delay this.
You must also notify HMRC that you're leaving the UK. Use the P85 form (available from HMRC) to notify them of your departure. This informs HMRC of your new country and ensures your tax status is updated correctly.
Before you leave, confirm you meet the conditions to be non-resident in the following tax year. Review the Statutory Residence Test (SRT) and count your expected days in the UK for the next tax year.
If you plan to spend 91+ days in the UK in the year after departure (or if you have a strong ties test position), you may unexpectedly remain UK-resident. Plan ahead to avoid this.
During a split year, income is apportioned between the UK part and the overseas part. This matters:
Income apportionment is precise, and getting it wrong creates tax underpayment or penalties. Work with your tax adviser to calculate this correctly.
If you have UK rental income as a non-resident, the first £1,000 is tax-free under the property allowance. This only applies if you have no expenses to claim. If your net rental income is under £1,000, you may not need to report it, but filing a return is usually safer.
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Once you're non-resident, remember:
Six months before departure: Meet with your tax adviser and build your exit plan. Identify CGT opportunities, pension contributions, and split-year eligibility.
Three months before departure: Crystallise any gains you plan to realise, maximise pension contributions, and prepare your Self-Assessment and P85 forms.
On departure: Notify HMRC, record your departure date for SRT purposes, and confirm your non-residence status in writing.
After departure: File your split-year claim on your Self-Assessment return (due 31 January). Keep records of your days in the UK and document your status for HMRC.
A structured exit from the UK is not a luxury-it's a necessity if you want to avoid tax surprises and reclaim reliefs you're entitled to. Many expats leave with thousands in unclaimed split-year relief, unmaximised pension contributions, and poorly timed asset disposals. You don't have to be one of them.
The tax rules are precise, but they are also unforgiving if you get them wrong. HMRC scrutinises expatriate tax returns carefully, and penalties for errors can be substantial. Get professional advice before you move.
Shil Shah is Skybound Wealth’s Group Head of Tax Planning and a Private Wealth Adviser, based in London. He works with clients who live global lives, executives, entrepreneurs, families and professionals who want clear, confident guidance on their wealth, their tax position and the decisions that shape their future.
This guide is educational. Tax law is complex and exit planning depends on your personal circumstances, assets, and destination country. Timing, asset sales, and pension contributions have legal consequences. Always consult a qualified tax adviser before leaving the UK.
This can significantly reduce the amount of income exposed to UK taxation after your departure.
Leaving the UK does not always eliminate future UK tax exposure. If you return within five years, gains realised while you were non-resident may become taxable when you come back.
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Leaving the UK without a structured tax plan can result in missed reliefs, unnecessary tax bills, and avoidable reporting mistakes. A proactive exit strategy helps you make better decisions before your residency status changes.
