What UK-source income triggers filing
UK non-residents with UK-source income (rental property, UK Ltd director salary/dividends, UK pension) still file Self Assessment for that income. The mechanics differ from residents — personal allowance may not apply, non-resident CGT rules apply, and double-tax-treaty relief needs correct claim on the return. This guide covers the practical mechanics.
What UK-source income triggers filing
UK rental property income: always UK-source, always requires SA if above £1,000 gross.
UK Ltd director fees / salary: UK-source. Reportable if not fully at source via PAYE.
UK Ltd dividends: technically UK-source. Non-resident dividend taxation depends on treaty position — sometimes exempt.
UK pension income: UK-source. Some pensions can be paid gross under treaty.
UK savings interest: usually treaty-exempt, but savings interest above a small threshold sometimes triggers SA.
How non-resident tax differs
Personal allowance: may not be available. Only UK/EEA nationals, and some others by treaty, get personal allowance as non-resident. Non-EEA non-residents typically taxed from £0.
Basic rate applies fully: the £12,570 buffer is often unavailable.
Non-resident CGT (NRCGT): UK residential property disposals by non-residents are taxable on the gain since April 2015. Return due 60 days after completion.
Company dividends: may be treaty-exempt from UK tax; the country of residence taxes instead.
Double-tax treaty relief
UK has treaties with 130+ countries. Purpose: prevent income being taxed twice.
Mechanism on SA106 (foreign) form: claim treaty exemption for income the treaty specifies as taxable only in the other country. Or claim credit for foreign tax paid on income also taxable in the UK.
Proof required: certificate of tax residence in the other country (issued by their tax authority), evidence of tax paid there.
Worked example
Sam moved to Australia in 2023. He kept a UK buy-to-let. Tax year 2024/25 UK rental income £14,000 gross, allowable expenses £4,500, net rental £9,500. As a UK national non-resident, he still qualifies for the £12,570 personal allowance. £9,500 - £12,570 = 0 taxable if this is his only UK income. If he has other UK-source income (Ltd director salary, dividends), it stacks. He still files SA (SA105 property page + main return). Deadline 31 January the following year. Non-resident CGT applies if he later sells the property. Australia also taxes the income under Australian rules; the UK-Australia treaty determines credit/exemption.
Reference table
| Income type | UK tax if non-resident | Treaty typically |
|---|---|---|
| UK rental property | Yes — via SA | Credit given by home country |
| UK Ltd salary (through PAYE) | Yes — usually at source | Credit or exemption |
| UK Ltd dividends | Sometimes exempt | Often exempt under treaty |
| UK pension | Depends on type | Some payable gross under treaty |
| UK savings interest | Often exempt | Usually exempt |
| UK property disposal (CGT) | Yes (NRCGT rules) | Only UK taxes property gains |
Non-resident SA checklist
- Confirm your UK-source income for the tax year
- Confirm your non-resident status via Statutory Residence Test
- Check personal-allowance eligibility (UK/EEA national or treaty)
- Get certificate of tax residence from your current country's tax authority
- File SA106 for foreign income declared on the return
- Report non-resident CGT within 60 days if property disposed
- Retain treaty-relief evidence for HMRC enquiry
- Get professional advice for complex or high-value non-resident tax
Yes — if you have UK-source income requiring SA. Your UTR remains yours regardless of residency.
Yes — HMRC's online SA is accessible worldwide via Government Gateway. Some services require UK phone verification which can be trickier abroad.
Non-treaty countries: you may pay UK tax on UK-source income at full rates without credit relief. Some countries have unilateral relief provisions.
Yes — UK state pension is UK-source. Some treaties allow gross payment to residents of the treaty country, but you may still need to report it on your home country's return.
You can't contribute in years you're not UK-resident (with some exceptions), but existing ISA holdings continue tax-free. Some home countries tax the growth under their own rules.
Sources & official references
Related on FreelanceToolkit UK
This guide is general information based on UK rules for the 2025/26 tax year. It is not personal tax or legal advice. For decisions affecting your tax position or legal exposure, consult a qualified accountant or solicitor.