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UK Capital Gains Historical 2022–24 Model

Reconstruct simplified 2022/23 and 2023/24 gains tax using historical allowances and asset rates.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

In the displayed 2023/24 ordinary-asset scenario, income of 20,000 and gains of 16,000 give historical gains tax of 1,000 and retained gain of 15,000.

Taxable gains = max(0,gain−historical allowance). Individuals split taxable gains across remaining basic-rate capacity; trustees use the higher historical asset rate.

Worked example

Enter these known values and leave the other values blank.

Annual income
20000
Other income
0
Capital gains
16000
Total annual income
20000
Capital gains tax
1000

Assumptions and limitations

  • This historical model supports only 2022/23 and 2023/24; its rates and allowances are not current tax guidance. It assumes the standard personal allowance and omits losses, reliefs, special trust rules and residence effects.
  • A trustee uses 20% for ordinary gains and 28% for residential property in these historical years. This corrects the source treatment of trustees as individuals with a remaining basic-rate band.
  • Clear an editable unknown before solving an inverse. Selection controls and forced outputs cannot be inferred.

Common questions

What does this model assume?

This historical model supports only 2022/23 and 2023/24; its rates and allowances are not current tax guidance. It assumes the standard personal allowance and omits losses, reliefs, special trust rules and residence effects.

Does this use current tax rates?

No. It reconstructs only the selected 2022/23 or 2023/24 historical year, with the exclusions stated above.

References

The calculation follows this reviewed mathematical model: Taxable gains = max(0,gain−historical allowance). Individuals split taxable gains across remaining basic-rate capacity; trustees use the higher historical asset rate. Required model inputs: Annual income must be nonnegative. Enter nonnegative gains before the annual exempt amount.

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