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Capital Gains Tax calculator

Work out the tax on a gain from selling shares, a second home or other assets.

Rates from 6 April 2026Rates checked 18 October 2026

By the ComputeNow team, checked against GOV.UK and HMRCSources (2)How we calculate

Your gain

Sale price minus what you paid and your costs.

Your yearly income

Before tax.

What did you sell?

Shares or fundsResidential propertyA business or business assetsSomething else

More optionsSale and purchase prices, other gains, losses, Business Asset Disposal Relief, pension and Gift Aid

Sale price

Optional: we'll work out the gain.

What you paid for it

Including stamp duty and buying costs.

Selling and improvement costs

Agent and legal fees, and improvements.

Other gains this tax year

From anything else you sold since 6 April.

Losses this tax year

Set against your gains in full.

Losses from earlier years

Losses you've reported to HMRC. Optional.

This gain qualifies for Business Asset Disposal Relief

For selling all or part of your business, or shares in your own trading company. Taxed at 18%.

Pension paid to a relief-at-source scheme

A year, what you paid. It extends your basic rate band.

Gift Aid donations

A year, what you gave. Optional.

No sign-up. No bank login. What you type stays in your browser.

Your Capital Gains Tax is

£3,163.80

on £20,000 of gains.

How it adds up

Item	Gain	Tax
Annual tax-free allowance	£3,000.00	£0.00
Gains within your basic rate band, at 18%	£15,270.00	£2,748.60
Rest of your gains, at 24%	£1,730.00	£415.20
Total Capital Gains Tax	£17,000.00	£3,163.80

This is an estimate, not advice. Gains on your main home are usually tax-free, and gains in an ISA or pension are never taxed. Scottish taxpayers use these UK rates and bands for Capital Gains Tax.

Your Capital Gains Tax is £3,163.80Breakdown

How Capital Gains Tax works

The first £3,000 of gains each year is tax-free. The rest is taxed at 18% while it fits in your unused basic-rate band, and 24% above that.

Higher and additional rate taxpayers pay 24% on all taxable gains.

Common questions

What are the Capital Gains Tax rates for 2026/27?

18% on gains within your basic rate band and 24% above it, for shares and property alike. The first £3,000 of gains each year is tax-free. Business Asset Disposal Relief gains are taxed at 18%.

Do I pay Capital Gains Tax on my home?

Usually not, if it has been your main home the whole time you owned it. You may pay on a second home or a buy-to-let, and must report and pay within 60 days of completion.

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Guides and help

Our guides

How Income Tax bands work in 2026/27Personal Allowance, basic, higher and additional rate

Official services and free advice

Capital Gains TaxGOV.UK: what you pay it on Report and pay Capital Gains TaxGOV.UK: deadlines and how to report Self Assessment tax returnsGOV.UK: who needs to send one

Sources

Each source was last checked on 18 October 2026.

These results are an estimate, not financial advice. They use the 2026/27 rates in force on 24 October 2026 and the inputs shown, so your actual tax, pay or costs may differ. Before making a decision about your money, check the figures with HMRC or your provider, or speak to a regulated financial adviser. Free, impartial guidance is available from MoneyHelper.

This page explains the rules using the 2026/27 rates in force on 24 October 2026. It is general information, not financial advice. For decisions about your own money, speak to a regulated financial adviser, or get free, impartial guidance from MoneyHelper.