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UK Capital Gains Tax Calculator

Estimate CGT on one disposal after costs, acquisition price, losses, reliefs and the annual exempt amount. This is an estimate, not tax advice.

Capital gains tax estimate

Enter one disposal to estimate UK Capital Gains Tax. Required fields are marked with an asterisk.

£

The sale price or other value received on disposal.

Used to select the relevant rate within the tax year.

£

£

For example, buying and selling fees and qualifying improvement costs; not mortgage interest.

£

Only enter allowable losses you can use against this gain.

£

Income after allowances and deductions; it determines the rate band.

Residential property and other assets can have different rates.

%

Your beneficial share of proceeds, costs and price.

Select no allowance if it has already been used elsewhere.

Enter an amount only if you have already confirmed eligibility; this tool does not calculate PRR.

Estimated Capital Gains Tax
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Complete the required disposal details, then calculate your estimate.

Estimate only: this is not professional tax advice. Check current HMRC Capital Gains Tax guidance.

How to use the UK Capital Gains Tax Calculator

Use the tax year and disposal date that apply to your transaction, then review the full calculation before relying on the estimate.

1

Enter the disposal and acquisition figures

Add disposal proceeds, purchase price and allowable costs for your beneficial ownership share.

2

Choose the tax assumptions

Select the tax year, asset type and taxable income before the gain to determine the rate bands.

3

Review the breakdown

Open View calculation breakdown to see deductions, taxable gain, rate-band allocation and estimated tax.

Frequently Asked Questions

Which tax years does the calculator support?

It supports 2024/25, 2025/26 and 2026/27. Select the tax year containing your disposal date.

Why do I need to enter taxable income?

Taxable income before the gain determines how much of the gain can use the basic CGT rate.

Does the calculator work out Private Residence Relief?

No. Enter only a relief amount you have already established as eligible.

Does this replace professional advice?

No. Seek qualified advice for decisions specific to your circumstances.

Are all costs allowable?

No. Check HMRC guidance to confirm whether a cost qualifies.

What does the estimate not cover?

It does not determine eligibility for reliefs or cover every special CGT regime, including trusts and non-residence.

Is my information stored?

No. Calculations run locally in your browser.