Guernsey income tax is charged at a flat 20% on your assessable income after allowances, under the Income Tax (Guernsey) Law, 1975. For 2026 the personal allowance is £15,200, and the scope of what gets taxed — Guernsey-source only or worldwide — depends on your residency status. There are no progressive bands, and the island imposes no capital gains, inheritance, or wealth taxes.
Who Pays Guernsey Income Tax
Residency decides the scope of your liability, and residency is measured in days. Three categories matter.
- Resident: 91 days or more in Guernsey during the calendar year, or 35 days or more combined with at least 365 days across the previous four years.1States of Guernsey. Residence and Your Tax Liability
- Solely Resident: Meets the Resident test and is not resident in any other jurisdiction that year. Spending 91 days or more somewhere else makes you resident there for this purpose.1States of Guernsey. Residence and Your Tax Liability
- Principally Resident: 182 days or more in Guernsey during the year, or 91 days or more with at least 730 days over the previous four calendar years.1States of Guernsey. Residence and Your Tax Liability
If you are solely or principally resident, Guernsey taxes your worldwide income at 20% after allowances, regardless of where the money is earned or whether it enters the island.2Locate Guernsey. Tax Residency
If you fall into the Resident Only category, you have a choice. Pay tax on your worldwide income like everyone else, or pay tax on your Guernsey-source income and a flat standard charge of £50,000 covering all non-Guernsey income.3States of Guernsey. Income Tax Rates and Allowances The election only helps if your overseas income would otherwise generate more than £50,000 in Guernsey tax.
New arrivals get a transitional rule. If you qualify as solely or principally resident in your first full year and were not resident in Guernsey the year before, you are treated as principally resident from your arrival year.1States of Guernsey. Residence and Your Tax Liability
The 20% Rate and Personal Allowance
The individual rate is 20% flat, applied to your total income minus allowances and deductions. No progressive brackets.3States of Guernsey. Income Tax Rates and Allowances
For 2026 the personal allowance is £15,200 per person, subtracted from total income before the 20% rate applies. Married couples and civil partners can transfer any unused personal allowance to their spouse, but both partners must complete a tax return in the relevant year for the transfer to process.3States of Guernsey. Income Tax Rates and Allowances
The allowance tapers for high earners. Once your total income exceeds £85,000, the personal allowance is reduced by £1 for every £5 above that threshold.3States of Guernsey. Income Tax Rates and Allowances Push far enough above the threshold and the allowance disappears entirely, meaning 20% on every pound.
Reliefs and Deductions That Reduce Your Bill
Pension Contributions
Contributions to Guernsey-approved pension schemes are deductible up to the lower of 100% of your taxable income or £35,000 per year. The cap covers your total contributions across all approved schemes, including Retirement Annuity Trust Schemes and Retirement Annuity Contracts. Unused relief can be carried forward for up to six years. Only cash contributions qualify; transferring an asset into a pension scheme does not.4States of Guernsey. Tax on Pensions
Mortgage Interest Relief
Relief on mortgage interest paid for your main home continues, but it is being phased out. The 2026 maximum is £3,500 per person. For rental properties you own domestically, interest relief is 50% of the interest paid.3States of Guernsey. Income Tax Rates and Allowances Plan for further reductions in future years.
Rent-a-Room Relief
From 2026, if you let up to two furnished rooms in your main home to a non-family member over 18, you can claim an allowance of up to £10,000 per rented room. Gross rental income beyond that per-room figure is taxed at 20%.3States of Guernsey. Income Tax Rates and Allowances
Charge of Child Allowance
The charge of child allowance rises to £9,800 per child in 2026.3States of Guernsey. Income Tax Rates and Allowances
Tax Caps on Large Incomes
Guernsey caps total tax liability for people with substantial income. For 2026, tax payable on non-Guernsey source income (plus Guernsey bank interest) is capped at £160,000.5States of Guernsey. Tax Cap Guernsey-source income beyond bank interest is taxed at 20% on top of that cap.
Where both domestic and foreign income are high, a combined cap of £320,000 applies to total tax payable.5States of Guernsey. Tax Cap Income from Guernsey land and property and certain pension lump sums sits outside both caps and is taxed at 20% regardless. The cap must be elected; it does not apply automatically.
What Guernsey Does Not Tax
Guernsey imposes no capital gains tax, inheritance tax, estate duty, gift tax, or wealth tax. Selling an asset at a profit, passing wealth to heirs, or gifting property to family members triggers no Guernsey tax liability. If you are moving from a jurisdiction that taxes those events, the absence changes the arithmetic of long-term planning considerably.
Social Security Sits Alongside Income Tax
Social security is separate from income tax but comes out of the same paycheck. For 2026 both employees and employers contribute 7.1% of gross earnings. Contributions stop being calculated once earnings exceed £3,780 per week or £16,380 per month.6States of Guernsey. Benefit Payment and Contribution Rates for 2026 Employers with staff past pension age pay 7.5%.
Combined with income tax, the effective marginal rate for an employee earning under the ceiling reaches 27.1% before allowances are applied.
How to File Your Return
Returns cover the calendar year and are filed through the Revenue Service online portal at my.gov.gg. Registration paths differ depending on whether you file as an individual, an organisation, an accountant, or a corporate service provider. New arrivals must register with the Revenue Service first to obtain a tax reference and social security number before accessing online services.7States of Guernsey. Revenue Service Online
If you are employed, your gross pay and tax withheld arrive through the Employed Tax Instalment (ETI) scheme, which operates similarly to PAYE in the UK. Your employer handles deductions during the year and the figures feed into your annual return. You will also need bank interest statements, records of rental income and expenses where relevant, and receipts for pension contributions.
All information on the return must reflect your status as of 31 December of the tax year. Confirm that your name and social security number match Revenue Service records to avoid processing delays.
Deadlines, Penalties, and Surcharges
Missing the filing deadline gets expensive quickly. If your return arrives late, the Revenue Service imposes an initial penalty of £200 for individuals (£300 for companies). Daily penalties of £10 then accumulate until the return arrives. Submit within 30 days of the initial penalty and the daily charges are waived; submit after 30 days and the daily penalties are backdated to the date of the initial penalty.8States of Guernsey. Penalties If your income falls below the personal allowance, the penalty is capped at £50, but only after your return is received and your assessment is issued.
Late payment is charged separately. If you do not pay your tax bill by the due date, a 5% surcharge is added to the outstanding amount, and further 5% surcharges are imposed at six-month intervals if the debt remains unpaid.9States of Guernsey. If You Cannot Pay Your Tax or Contributions Bill on Time When an assessment is revised to include additional income, the 5% surcharge can be backdated to the original due date, with subsequent charges stacking every six months.
Appealing an Assessment
You have 30 days from the date on an assessment, penalty notice, or surcharge notice to file a written appeal with the Revenue Service. The window covers final assessments, late-filing penalties, surcharges, and disputed repayment calculations.10States of Guernsey. Appeals
Filing an appeal does not pause your obligation to pay. You remain liable for the full amount while the appeal is considered, and further surcharges accrue if you do not pay.9States of Guernsey. If You Cannot Pay Your Tax or Contributions Bill on Time Surcharge appeals go to the Guernsey Revenue Service Tribunal. Pay the bill, then dispute the assessment.
Double Taxation Agreements and FATCA
Guernsey has full double taxation agreements with 15 jurisdictions including the United Kingdom, Singapore, Hong Kong, Luxembourg, Jersey, and the Isle of Man, plus partial agreements with countries including Australia, Ireland, Japan, the Netherlands, New Zealand, and several Nordic nations.11States of Guernsey. Double Taxation Arrangements These agreements allocate taxing rights so the same income is not taxed twice.
The UK arrangement is the most commonly relevant. Under it, a company incorporated in Guernsey but managed and controlled from the UK is treated as UK-resident for the agreement’s purposes, meaning it is not chargeable to Guernsey tax and need not file a Guernsey company return unless it has Guernsey-source income other than bank interest.11States of Guernsey. Double Taxation Arrangements
US citizens and green card holders should note that Guernsey participates in the US Foreign Account Tax Compliance Act framework through an intergovernmental agreement signed in December 2013.12States of Guernsey. Intergovernmental Agreements (FATCA) Guernsey financial institutions report account information to the US, and US filing obligations continue regardless of where you live. Guernsey residency does not remove your responsibility to the IRS.
2026 Changes to Know
Beyond the allowance and rate figures already covered, the 2026 budget introduced several changes worth tracking.
- Share scheme taxation: when an employer gifts shares or options to buy shares below market value, the taxable event is now the date the shares vest or are exercised, or seven years from the grant date, whichever comes first. The taxable amount is still calculated based on the value at the time of the grant.3States of Guernsey. Income Tax Rates and Allowances
- Shareholder loan repayments: repayments of loans to shareholders are now classified as dividends for tax purposes. Repayments of genuine commercial loans by trading companies are excluded.3States of Guernsey. Income Tax Rates and Allowances
- Excess repairs allowance for landlords: the calculation method shifts from a five-year average basis to a current-year basis starting in 2026, with transitional provisions.3States of Guernsey. Income Tax Rates and Allowances
The shareholder loan reclassification is the one most likely to catch owner-managers off guard. Anyone extracting funds from a company as a loan rather than a dividend will need to restructure or face an unexpected tax bill.