Overseas Workdays Relief (OWR) 2026/27: Complete Guide — Eligibility, the 30% Cap, Audit-Proofing & Trade-offs
OWR lets eligible new UK residents exempt a portion of employment income earned on days worked outside the UK. From 6 April 2026 the relief is capped at 30% of overseas workdays. This single guide covers everything former articles split across four pages.
What OWR Is and Who Qualifies
Overseas Workdays Relief exempts part of the employment income of someone who is UK resident but not domiciled (or not formerly domiciled), and who performs duties outside the UK on "overseas workdays" during their first four years of UK residence.
Core conditions (2026/27):
- • You are in your first four years of UK residence (split-year treatment may apply).
- • You perform employment duties outside the UK on the day in question.
- • You make a formal election in your Self Assessment return.
- • Relief is capped at the lower of actual overseas days or 30% of total workdays.
Why the 30% Cap Changes Everything
Before 2026, OWR was effectively uncapped for qualifying days. From 6 April 2026 the relief can never exceed 30% of your workdays, whichever is the smaller of:
- Your actual overseas workdays, or
- 30% of your total workdays in the tax year.
If you work 40% of days abroad, only the first 30% qualifies. If you work only 12% abroad, only that 12% qualifies.
A Paradigm Shift in Global Mobility
The 30% cap reframes OWR from a near-automatic benefit into a structured optimization problem. Mobility teams can no longer assume "claim it for everyone." Instead, each assignee needs a pre-arrival break-even model.
What changed in practice
- • Relief is bounded, so the marginal value of extra overseas days beyond 30% is zero.
- • The Personal Allowance forfeiture (see trade-offs) now dominates the decision for mid earners.
- • Assignment structuring (where duties are performed) matters more than headcount.
Audit-Proofing Your OWR Claim
HMRC can challenge an OWR claim up to six years after the tax year. Contemporaneous evidence is essential.
Evidence to keep
- • Boarding passes / travel itineraries
- • A dated work-log of duties performed abroad
- • Employer assignment letter
- • Pre-arrival break-even calculation
Common failure points
- • Claiming days where no duties were performed
- • Missing the formal election
- • Exceeding the 30% cap
- • No contemporaneous records
The Hidden Trade-offs: Forfeiting Statutory Allowances
Electing into OWR carries a statutory price: you forfeit your £12,570 Personal Allowance and the £3,000 CGT Annual Exempt Amount for that year. For modest overseas travellers, the lost allowances can exceed the relief.
The Forfeiture Trap
Forfeiting the Personal Allowance affects earners unevenly (it is already tapered above £100k), but the loss of the CGT exemption is absolute regardless of income.
Break-Even Analysis for Corporate Assignees
Consider an executive on £90,000 who logs 24 overseas days out of 240 (10%). Without OWR, the £12,570 Personal Allowance applies. With OWR, 10% of salary (£9,000) is exempt, but the Personal Allowance drops to £0 — increasing taxable income by £3,570. In this scenario, electing OWR costs more than it saves.
Cross-Border Capital Gains Traps
The lost CGT Annual Exempt Amount is especially punishing if you are liquidating non-UK portfolios, selling property, or realising crypto while UK-resident. Minimal employment savings can be eclipsed by the CGT hit.
The Net Savings Equation
Only when the result is positive should a formal election be made. Mobility teams should pre-screen every assignee with this formula.
Quick Answers
Is OWR automatic or do I elect?
Can I claim OWR after four years?
What if I exceed 30% overseas days?
Further Reading
Model your overseas ratio and see the break-even point live.