The Guernsey personal tax allowance for the 2026 tax year is £15,200. That is the slice of income you can earn before any tax applies, and because Guernsey charges a flat 20% on everything above it, the allowance is worth up to £3,040 off your annual bill.1States of Guernsey. Income Tax Rates and Allowances Whether you receive the full amount depends on your residency category, your total income, and whether a partner transfers unused allowance to you.
How the Allowance Works Against Your Income
Guernsey has no tiered brackets. All taxable income is charged at a single rate of 20%, and your personal allowance is subtracted before that rate applies, so it operates as a straight deduction rather than a credit.1States of Guernsey. Income Tax Rates and Allowances
Earn £40,000 in 2026 and you subtract the £15,200 allowance, then pay 20% on the remaining £24,800. That comes to £4,960. Earn £20,000 and the bill is £960. The allowance covers all income types added together — wages, pensions, investment returns, rental income — as a single pot rather than a separate figure for each source.1States of Guernsey. Income Tax Rates and Allowances
The £85,000 Taper for Higher Earners
The full £15,200 is only available if your total income stays under £85,000. Above that point, the allowance begins to taper: you lose £1 of allowance for every £5 of income over the threshold.2States of Guernsey. Withdrawal of Personal and Other Tax Allowances for Higher Earners The States of Deliberation sets this threshold each year through the annual budget, and £85,000 is the figure for 2026.1States of Guernsey. Income Tax Rates and Allowances
Because £15,200 withdrawn at £1 per £5 of income takes £76,000 to eliminate, the allowance reaches zero at total income of £161,000. Between £85,000 and £161,000, the withdrawal also applies to other personal deductions, not just the standard allowance, so the effective marginal rate over that band runs higher than the headline 20%. Above £161,000, every pound is taxed at the flat rate with no allowance to shelter it.
Residency and Who Receives the Allowance
How much of the allowance you get also turns on your residency category. Guernsey recognises three tiers, each with its own day-count test:3States of Guernsey. Entering or Leaving Guernsey, Residence and Working Away
- Resident. Present in Guernsey for at least 91 days in the calendar year, or at least 35 days with 365 or more days accumulated over the previous four years.
- Solely resident. Meets the resident test and is not resident anywhere else that year. Spending 91 or more days in another jurisdiction counts as being resident there.
- Principally resident. Present for 182 days or more, or at least 91 days with 730 or more days accumulated over the previous four years.
Principally resident and solely resident individuals are taxed on their worldwide income and generally receive the full personal allowance. Someone classified as resident only is taxed by default on Guernsey-source income, but can elect to be taxed on worldwide income if allowances and reliefs make that the lower bill. The election matters most when Guernsey earnings are high while the wider worldwide picture would open up enough deductions to offset the extra tax.
Moving to or Leaving Guernsey Mid-Year
The allowance is not given in full if you arrive or depart partway through the tax year. It is time-apportioned by the number of days you spend on the island during that calendar year, and the same pro-rata treatment applies to anyone classified as resident only or non-resident.4Worldwide Tax Summaries. Guernsey, Channel Islands – Individual – Deductions Arriving on 1 July, for example, gives you roughly half the standard figure for that year.
Sharing Unused Allowance With a Partner
Guernsey moved to mandatory independent taxation on 1 January 2023. Everyone files their own return regardless of marital status, and there is no option for a joint assessment.5States of Guernsey. Independent Taxation That does not stop a couple from making use of both allowances between them.
Married couples, civil partners, and cohabiting partners can transfer unused allowance to each other. If one partner earns less than £15,200, the unused portion moves across to reduce the higher earner’s bill.5States of Guernsey. Independent Taxation Both partners still submit separate returns; the transfer simply flows through each person’s allowance calculation. For households with one non-working or lower-earning partner, this is the standard route to keeping the combined bill down.
Other Allowances That Stack On Top
Beyond the £15,200, a handful of further deductions can reduce your taxable income. These are subject to the same higher-earner withdrawal rules once total income passes £85,000.
- Dependent relative allowance. A flat £4,390 for 2026 if you financially support a dependent relative.
- Charge of child allowance. £9,800 per child for the 2026 tax year.
- Mortgage interest relief. Interest on a mortgage for your principal private residence qualifies for relief up to £3,500 per person. The phased removal of this relief has been paused, so the £3,500 cap holds for 2026.1States of Guernsey. Income Tax Rates and Allowances
All of these are claimed through your personal tax return. Where two partners share a mortgage on the same property, each can claim up to £3,500, so combined household relief can reach £7,000.
A Note on Tax Caps for Very High Incomes
If your income is high enough that the taper wipes out your allowance entirely, Guernsey’s tax cap system may become the more relevant figure. Tax on income earned outside Guernsey (plus Guernsey bank interest) is capped at £160,000 a year, and a combined cap of £320,000 covers total worldwide tax where you have significant income from both sources. Rental income from Guernsey property and certain pension lump sums fall outside the cap and are taxed separately.6States of Guernsey. Tax Cap
New residents who have not lived in Guernsey during the previous three years can claim a reduced cap of £60,000 a year for their first four years on the island, provided they pay at least £50,000 in document duty on a property on Part A of the Open Market Register, purchased within 12 months of taking up residence.6States of Guernsey. Tax Cap The caps are a separate regime from the standard allowance and apply only once your income is well past the point where the allowance itself matters.