Split-Year Treatment: UK Tax When You Move Abroad 2026

Quick answer

Split-year treatment lets you be taxed as a UK resident for only part of the 2026/27 tax year when you move to or from the UK. You must first be UK resident for the year under the Statutory Residence Test, then meet one of eight cases. The UK part is taxed on worldwide income and gains; the overseas part on UK-source income only.

Why a single tax year normally counts in full

UK residence is decided one tax year at a time. The tax year runs from 6 April to 5 April, and the default position is binary: you are either UK resident for the whole year or non-resident for the whole year. There is no halfway status in the headline rule.

That creates an obvious problem. If you leave the UK on, say, 30 September and become resident in another country, the default rule would still treat you as UK resident for the entire 2026/27 year, taxing your worldwide income and gains right up to 5 April 2027 -- including everything you earned abroad after you left. Split-year treatment is the relief that fixes this. It is not an exemption from tax; it is a way of dividing the year so that the period before or after your move is treated as an overseas part.

Step one: the Statutory Residence Test

Before split-year treatment can do anything, you have to be UK resident for 2026/27. That is determined by the Statutory Residence Test (SRT), which works through three stages in order.

• Automatic overseas tests -- if you meet one of these, you are non-resident and split-year treatment is irrelevant.
• Automatic UK tests -- if you meet one of these (and no overseas test applies), you are resident.
• Sufficient ties test -- if neither set of automatic tests settles it, your UK day count is weighed against ties such as family, accommodation, work, and previous presence.

Day-counting is central to all of this, so a contemporaneous travel log is essential. Only once the SRT confirms you are resident for the year do you move to the second step: checking whether any split-year case applies.

The eight split-year cases

There are eight cases. Three apply to people leaving the UK and five to people arriving. You do not pick freely -- you must genuinely meet the conditions of a case, and each case sets its own date for when the year splits.

Leaving the UK

Arriving in the UK

If you potentially meet more than one case, there are priority rules that decide which applies and therefore which split date governs. Getting the date right matters because it draws the line between the taxed and untaxed parts of your year.

What gets taxed in each part

Once the year is split, the treatment of each part is straightforward in principle:

• UK part -- you are taxed as a UK resident on your worldwide income and gains arising in that period.
• Overseas part -- you are generally taxed only on UK-source income, such as UK rental profit or earnings from UK duties. Foreign income and gains arising in the overseas part are usually outside the UK net.

This is why timing is everything. A foreign bonus, a share disposal, or a pension lump sum can land in either part depending on when it is received or realised. Falling in the overseas part can take it out of UK tax entirely; falling in the UK part brings it fully into charge.

A worked illustration

Imagine you leave the UK on 30 September 2026 to start a full-time job in Spain, qualifying under Case 1. The year splits on the day your overseas work begins.

Your UK salary earned before you left sits in the UK part and is taxed normally. Your Spanish salary earned after the split is in the overseas part and is outside UK Income Tax. If you keep a UK rental property, that rental profit stays taxable in both parts because it is UK-source. You can model the UK-part liability with the

calculator, treating only the UK-part income as taxable here.

Personal Allowance and the headline rates

A common worry is whether your Personal Allowance is cut down for a split year. Generally it is not. You normally keep the full GBP 12,570 allowance for 2026/27, and it is not pro-rated for the part of the year you were a UK resident, provided you are entitled to it.

The usual rules still bite, though. The allowance is tapered by GBP 1 for every GBP 2 of income above GBP 100,000, disappearing entirely at GBP 125,140 and creating the well-known 60% effective band in between. The 2026/27 Income Tax bands for England, Wales, and Northern Ireland remain:

Scottish taxpayers use the Scottish bands instead, running from a 19% starter rate up to a 48% top rate. If your move involves crossing into or out of Scotland as well as the UK, that adds another layer to check.

Capital Gains Tax and the split

Capital Gains Tax follows the split too. Gains realised in the UK part are within UK CGT; gains in the overseas part generally are not, subject to anti-avoidance rules for assets you held before leaving. For 2026/27, CGT is charged at 18% within your remaining basic-rate band and 24% above it, after the GBP 3,000 annual exempt amount. Business Asset Disposal Relief gives an 18% rate on qualifying disposals.

There is an important trap. Temporary non-residence rules can claw back gains if you leave the UK and return within a defined period, treating gains realised while away as arising on your return. So a split year today does not guarantee a foreign gain escapes UK tax forever if you come back soon. Model any disposal with the

calculator and take advice before relying on the overseas part.

How to claim and what to keep

You report split-year treatment through Self Assessment on the residence pages (form SA109). You are not making a discretionary election -- you are stating that a case applies and on what date the year split. HMRC can ask you to back that up, so keep:

• A full travel log of UK days for each tax year.
• Your employment contract and start or end dates.
• Tenancy or property records showing when a home began or ceased.
• Overseas tax residency certificates and foreign tax returns.

Common mistakes to avoid

• Assuming the split is automatic. No case, no split -- you are then resident for the whole year on worldwide income.
• Confusing the SRT with split-year treatment. The test decides residence; the cases only carve out part of a resident year.
• Getting the split date wrong. Each case has its own date, and the wrong date moves income into the taxed part.
• Forgetting UK-source income. UK rent and UK duties stay taxable even in the overseas part.
• Ignoring the destination country. Relief here does not stop another country taxing the same income.

The bottom line

Split-year treatment is a precise relief, not a general escape hatch. Establish residence under the Statutory Residence Test, identify which of the eight cases fits your move, pin down the exact split date, and then time your income and gains so they fall in the most favourable part of the year. Because this is Your Money or Your Life territory and the cases overlap, get professional advice for any move involving meaningful foreign income, disposals, or pension and employment payments.