The UK side, explained.
The UK taxes on residence rather than nationality. That makes the threshold question a factual one, and the answer decides everything that follows.
Residence is a test, not a feeling
The statutory residence test decides your UK position on counted days and defined ties, not on where you consider home to be. It runs in a fixed order: automatic overseas tests first, then automatic UK tests, then the sufficient-ties test.
Because it is mechanical, it is also plannable. Knowing where you sit before a tax year ends is far more useful than establishing it afterwards, particularly in a year you move.
Not everyone has to file
If all your UK income runs through PAYE and nothing else is going on, you may have no Self Assessment requirement at all. Plenty of people file who need not, and plenty who should file assume PAYE has covered it.
You will generally need to file with self-employment or rental income, untaxed foreign income, capital gains to report, higher-rate liability, or where HMRC has issued a notice to file.
- Self-employment or rental income
- Untaxed foreign income or gains
- Higher-rate or additional-rate liability
- A notice to file issued by HMRC
Where the US changes the answer
Several things that are genuinely tax-free in the UK are not tax-free to the IRS. An ISA is the clearest case: no US recognition of the wrapper, and most of what sits inside one is a PFIC.
The same applies to a pension's tax-free lump sum and to Private Residence Relief on a home sale. Where you have US exposure, the UK-optimal choice and the overall-optimal choice are frequently not the same thing.
Related pages
- Free tool
UK statutory residence test
Work through the UK statutory residence test: the automatic tests, the sufficient ties, and the day counts that decide which side of the line you sit.
- Pillar guide
Tax specialists for US and UK
What US and UK tax specialists handle that a general accountant does not: residence tests, treaty relief, FBAR, PFICs, pensions, property and catch-up filings.
- Service
UK Self Assessment
UK Self Assessment prepared alongside your US return: residence, remittance planning, and reliefs claimed in the right country.
- Pillar guide
Accountants for US and UK
How to choose accountants for US and UK tax: what each credential permits, how to verify it, what drives the fee, and when you do not need a specialist.
- Who we help
Brits in the US
UK citizens in the US: residency tests, UK property and pensions held from abroad, and the reporting that US residence triggers on everything left behind.
- Service
183-day US residence status
The US 183-day rule explained: the substantial presence test formula, exempt individuals, the closer connection exception and the treaty tie-breaker.
Further reading
- The statutory residence test in the year you move
Arrival and departure years are where the test bites hardest, and where Americans get it wrong most often. Here is how the three stages actually run.
- Bona fide residence or 330 days: which test should you use?
Two tests open the door to the foreign earned income exclusion. One counts days and the other weighs your life. Picking the wrong one costs a year of relief.
- Register for Self Assessment by 5 October - the American's guide
The 5 October date is the quiet deadline that catches movers. Why Americans in the UK hit it more than anyone, and how to handle it properly.
Last reviewed . Thresholds and rates change annually — check figures against the current tax year before relying on them.
Have UK filings and US exposure?
We prepare both together so the reliefs are claimed in the right country, in the right order. Tell us your position.