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United Kingdom Income Tax Calculator

Estimate income tax in United Kingdom across a tax-free allowance and two rate bands, with effective and marginal rates.

About United Kingdom Income Tax Calculator

Progressive systems tax each slice of income at its own rate rather than applying one rate to the whole amount. That is why the effective rate is always below the marginal rate — only the last slice is taxed at the top rate you reach. Indicative bands for United Kingdom. Confusing the marginal rate with the effective rate leads people to believe a pay rise leaves them worse off, which progressive banding never does.

Formula

United Kingdom Income Tax

Tax = (band 1 income × basic rate) + (income above the threshold × higher rate)

allowance
Income taxed at zero per cent
threshold
Income level where the higher rate begins

Worked example

With the default values below, United Kingdom Income Tax Calculator returns Total Income Tax of £7,340.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual taxable incomeminimum 0 GBP
47,000 GBP
Tax-free allowanceminimum 0 GBP
10,300 GBP
Basic rateaccepts 0–100 %
20 %
Income where the higher rate startsminimum 0 GBP
54,000 GBP
Higher rateaccepts 0–100 %
35 %

Results

Total Income Tax
£7,340.00
Income After Tax
£39,660.00
Effective Tax Rate
15.62%
Marginal Rate on the Next Unit Earned
20.0%
Monthly Income After Tax
£3,305.00

Step by step

  1. 1Values used
  2. 2United Kingdom Income Tax
  3. 3Total Income Tax= 7,340.00
  4. 4Income After Tax= 39,660.00
  5. 5Effective Tax Rate= 15.62
  6. 6Marginal Rate on the Next Unit Earned= 20.0
  7. 7Monthly Income After Tax= 3,305.00

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is United Kingdom Income Tax calculated?

Tax = (band 1 income × basic rate) + (income above the threshold × higher rate) Progressive systems tax each slice of income at its own rate rather than applying one rate to the whole amount. That is why the effective rate is always below the marginal rate — only the last slice is taxed at the top rate you reach.

Why does United Kingdom Income Tax matter?

Indicative bands for United Kingdom. Confusing the marginal rate with the effective rate leads people to believe a pay rise leaves them worse off, which progressive banding never does.

What values do I need to enter?

This calculator takes 5 inputs: Annual taxable income, Tax-free allowance, Basic rate, Income where the higher rate starts, Higher rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Related Calculators

United Kingdom specifics

Currency
£ GBPBritish Pound
Region
Europe
Country code
GB
Amounts look like
£1,234,567.89
Dates look like
9 Mar 2026
Units
metricWeek starts Monday

Results on this page are expressed in GBP (British Pound). Figures are estimates for general planning — confirm current rates and thresholds with the relevant United Kingdom authority before relying on them.

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United Kingdom Income Tax Calculator | Calcrivo