A few months back can make you resident for the year
The intuitive plan, pop back for six months, take the lump sum, fly out again, runs straight into the Statutory Residence Test. Spend 183 days or more in the UK in a tax year and you are automatically UK resident, with no other test needed, and shorter stays can still make you resident through the sufficient ties test. Residence is decided for whole tax years, and your period of non-residence can only begin or end partway through a year where split-year treatment applies. So a few months in the UK is not a neutral visit: it can end your period of non-residence, and the date it ends is what the five-year test is measured against.
The five-year trap catches pensions specifically
The temporary non-residence rules apply where you had sole UK residence in at least 4 of the 7 tax years before you left and your absence lasts 5 years or less. When they bite, a defined list of income and gains realised during your time abroad is treated as arising in the tax year you return and taxed then, at that year's rates. HMRC's guidance explicitly includes certain pension payments and lump sums on that list, alongside chargeable gains on assets you owned before leaving, close-company dividends and life-policy gains. That is why taking pension benefits while non-resident, then resuming UK residence inside the window, can undo the planning entirely. The full mechanics are in our temporary non-residence guide.
Measure the clock properly before you book
To fall outside the rules your period of non-residence must exceed five years, which HMRC states means at least five years and one day. The clock does not run in calendar years from the day your plane left: it runs from the end of your last period of sole UK residence to the start of the next one, using SRT and split-year dates. A trip that looks like five clear years on a calendar can still fall inside the window once the correct dates are applied, and errors are usually irreversible once the year of return has passed. Whether the lump sum itself is better taken while resident or non-resident also depends on the treaty with your current country, so the sequencing deserves proper advice. Horizon UK Tax Solutions will confirm your dates, the treaty position and the safest timing on a fixed fee agreed upfront; book a free 30 minute clarity call before you commit to travel.