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Guernsey Income Tax Calculator

Enter your income to see Guernsey’s flat 20% income tax after the personal allowance and your take-home pay in pounds. Compare any two tax years side by side.

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Tax Calculator

Guernsey — 2026 Tax Year

2026 Tax Year

Select the tax year to view applicable rules and rates

This is an estimate. Consult a tax professional for accurate calculations.

Enter your income to calculate

Fill in your gross income and filing status, then calculate to see your tax breakdown.

How to use Guernsey Income Tax Calculator

This Guernsey income tax calculator works out Guernsey income tax at the flat 20% rate for 2023, 2024, 2025 and 2026. Guernsey applies 20% to income after a personal allowance (around £13,900); this calculator applies 20% to gross as a transparent upper estimate. Social Security of 6.8% is documented but not deducted. The calculator shows your income tax, effective rate and take-home pay in pound sterling, and lets you compare any two tax years side by side.

  1. Select your tax year (2023, 2024, 2025, or 2026).
  2. Enter your annual gross income in pound sterling (GBP).
  3. Keep the filing status as Individual.
  4. Click Calculate to see your income tax, effective rate and take-home pay.
  5. Turn on the year-comparison view to see two tax years side by side.

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How Guernsey’s flat 20% income tax works

Guernsey charges a flat 20% income tax on income after a personal allowance of around £13,900. The 20% rate is stable across 2023 to 2026. High earners can elect a tax cap on their total liability. This calculator applies 20% to gross as a transparent upper estimate.

Allowance and Social Security

A personal allowance (around £13,900) reduces taxable income, and employees pay 6.8% Social Security. These are documented but not deducted, so the calculator shows the 20% rate on gross. Consult the States of Guernsey Revenue Service for exact figures.

Worked examples

Income £50,000, 2026

Inputs: £50,000 income

Result: £10,000 income tax (20%) · take-home £40,000

Income £100,000, 2026

Inputs: £100,000 income

Result: £20,000 income tax (20%) · take-home £80,000

Income £200,000, 2026

Inputs: £200,000 income

Result: £40,000 income tax (20%) · take-home £160,000

Glossary

Taxable income
Income remaining after eligible deductions and exemptions that tax rates are applied to.
Progressive tax
A system where higher portions of income are taxed at higher marginal rates.
Marginal rate
The tax rate that applies to your next unit of taxable income within its bracket.
Net income
Take-home income after taxes and mandatory contributions are subtracted from gross pay.

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