Finance Tool

Capital Gains Tax Calculator UK

Calculate your UK Capital Gains Tax for the 2025/26 tax year. Enter your asset details and annual income to see your taxable gain, CGT bill, and a full breakdown by tax band.

2025/26 tax year • Annual exempt amount: £3,000 • Rates: 18% / 24%

Calculate Your Capital Gains Tax

Asset Type

CGT does not apply to your main home (principal private residence) or ISA investments.

Shares Purchase Price (£)

The original price you paid for the asset (acquisition cost)

Shares Sale Price (£)

The price you sold (or expect to sell) the asset for

Allowable Costs (£)

Fees, legal costs, stamp duty, and improvement costs (not maintenance)

Annual Income (£)

Your total annual income from employment, pensions, and other sources (before tax)

How to Use This Capital Gains Tax Calculator

Select Asset Type

Choose whether you are selling shares, property (not your main home), or other assets. CGT does not apply to your principal private residence.

Enter Asset Values

Type the original purchase price and the sale price. Include any allowable costs such as legal fees, stamp duty, and improvement costs.

Enter Your Income

Your annual income determines which CGT rate band applies. The basic rate band remaining after your income is used at 18%, the rest at 24%.

Review Your Breakdown

See your total gain, taxable gain after the annual exempt amount, CGT bill broken down by rate band, and your net proceeds after tax.

2025/26 UK Capital Gains Tax Rates

Capital Gains Tax Rates

Tax Band	CGT Rate
Annual Exempt Amount	0% (first £3,000)
Basic Rate Taxpayer	18%
Higher / Additional Rate Taxpayer	24%

These rates apply to all asset types for 2025/26. Previously, residential property had higher rates (18%/28%), but from October 2024 a single set of rates applies.

Key Thresholds

Threshold	Amount
Annual Exempt Amount	£3,000
Personal Allowance	£12,570
Basic Rate Band	£37,700
Basic Rate Ceiling	£50,270

The basic rate ceiling is the Personal Allowance (£12,570) plus the basic rate band (£37,700). Income above this level means your gains are taxed at the higher 24% rate.

How UK Capital Gains Tax Is Calculated

CGT = (Taxable Gain in Basic Band x 18%) + (Taxable Gain in Higher Band x 24%)

Capital Gains Tax is charged on the profit you make when selling an asset, not the total sale price. The calculation follows these steps:

Gain = Sale Price - Purchase Price - Allowable Costs

Calculate your gain — subtract the original purchase price and any allowable costs (legal fees, stamp duty, improvement costs) from the sale price
Apply the annual exempt amount — deduct £3,000 from your gain (use it or lose it each year)
Determine your available basic rate band — the basic rate band (£37,700) is shared with your income tax. Subtract your taxable income to find how much remains for capital gains
Apply CGT rates — taxable gains within your remaining basic rate band are taxed at 18%, gains above are taxed at 24%

Available Basic Rate Band

Remaining Band = £37,700 - (Annual Income - £12,570)

If your taxable income already exceeds £50,270, all of your capital gains are taxed at the higher 24% rate.

Allowable Costs

You can deduct costs that are directly related to buying, selling, or improving the asset. This includes estate agent fees, solicitor fees, stamp duty land tax, and costs of improvements (but not maintenance or repairs). You cannot deduct mortgage interest, insurance, or day-to-day running costs.

Frequently Asked Questions

What is Capital Gains Tax (CGT)?

Capital Gains Tax is a tax on the profit (gain) you make when you sell or dispose of an asset that has increased in value. It is the gain you are taxed on, not the total amount of money you receive. CGT applies to most personal possessions worth over £6,000 (except your car), property that is not your main home, shares that are not held in an ISA or PEP, and business assets. You do not pay CGT on your main home (principal private residence), ISA or PEP investments, UK government gilts, personal possessions worth under £6,000, or betting and lottery winnings.

What is the Capital Gains Tax annual exempt amount for 2025/26?

The annual exempt amount (also called the CGT allowance) for the 2025/26 tax year is £3,000. This means the first £3,000 of your total taxable gains in a tax year are tax-free. The allowance was reduced from £6,000 in 2023/24 to £3,000 from April 2024 onwards. You cannot carry unused allowance forward to future years — it is a use-it-or-lose-it exemption. For most trusts, the annual exempt amount is £1,500.

What are the UK Capital Gains Tax rates for 2025/26?

For the 2025/26 tax year, Capital Gains Tax is charged at 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers. These rates apply to gains on all asset types including property, shares, and other assets. The rate you pay depends on your total taxable income: if your income plus gains fall within the basic rate band (up to £50,270), you pay 18%. Any gains above that threshold are taxed at 24%.

How does my income affect the CGT rate I pay?

Your income determines how much of the basic rate band (£37,700 for 2025/26) you have available for your capital gains. First, your income uses up the Personal Allowance (£12,570) and then the basic rate band. Any remaining basic rate band can be used by your capital gains at the 18% rate. Once the basic rate band is fully used, remaining gains are taxed at 24%. For example, if your annual income before the Personal Allowance is £30,000, you have £20,270 of basic rate band remaining. The first £20,270 of taxable gains would be taxed at 18%, and the rest at 24%.

Do I need to report capital losses to HMRC?

You should report capital losses to HMRC because they can be offset against gains in the same tax year or carried forward to reduce future gains. Losses must be reported within 4 years of the end of the tax year in which they occurred. You must use losses against gains in the same year first (even if this reduces your gain below the annual exempt amount). Any remaining losses can be carried forward indefinitely and used against future gains, but only to the extent that they reduce gains below the annual exempt amount.

Authoritative sources

HMRC — Capital Gains Tax: rates
The 18% rate on gains that fall inside the basic rate band and 24% on gains above it, applied to every asset type. HMRC publishes this pair as the rates in force from 6 April 2026.
HMRC — Capital Gains Tax: tax-free allowances
The £3,000 annual exempt amount this calculator deducts before working out tax, and the £1,500 trust figure quoted in the FAQ.
HMRC — Capital Gains Tax rates and annual tax-free allowances
The historical table behind the note that residential property had its own 18% / 28% rates until 30 October 2024, and behind the fall in the annual exempt amount from £12,300 to £6,000 to £3,000.
HMRC — Income Tax rates and Personal Allowances
The £12,570 Personal Allowance and £37,700 basic rate band the calculator subtracts your income from, and the £50,270 ceiling above which every gain is charged at 24%.
HMRC — Tax when you sell your home: Private Residence Relief
Why the asset picker says property that is not your main home: Private Residence Relief means there is normally no Capital Gains Tax when you sell the home you live in.
HMRC — Capital Gains Tax: if you make a loss
The loss case this calculator reports: a loss can be claimed up to 4 years after the end of the tax year of disposal, and unused losses carry forward once gains are reduced to the tax-free allowance.

Important Disclaimer

This calculator provides estimates for the 2025/26 tax year based on HMRC rates. It does not account for private residence relief, lettings relief, business asset disposal relief (formerly entrepreneurs' relief), investors' relief, annual exempt amount sharing between spouses, capital losses carried forward, or any other reliefs and exemptions. Results are for illustrative purposes only. For official tax calculations, refer to HMRC or consult a qualified accountant.

Published by Kalcify · Last updated 25 September 2026

Calculators are built against primary sources — government tax authorities (IRS, HMRC, CRA, ATO) for finance and the World Health Organization for health metrics. Updated when rates or rules change. View methodology and data sources.

More free calculators and tools you might find useful

Auto Loan Calculator 2026See monthly payment, total interest and a 60-vs-84-month comparison. Uses 2026 state vehicle-tax defaults and adjusts for net trade-in equity.Check ABNCheck an 11-digit ABN with the official modulus 89 checksum. See the weighted calculation instantly, then verify registration in ABN Lookup.Compound Interest CalculatorSee how monthly contributions compound, with total interest earned and a year-by-year balance table running from year one to your final figure.Council Tax Band Checker: 1991/2003 Value TestCheck an England, Scotland or Wales council tax band using official 1991 or 2003 value thresholds—without a national house-price deflator or bill estimate.CPP Calculator Canada 2026Estimate your 2026 CPP pension with the $1,507.65 maximum, 5.95% contribution rate, CPP2 and exact age 60–70 adjustments. See every assumption.Dividend Tax Calculator UK 2026/27Enter salary and dividend income to see your dividend tax bill at the 2026/27 HMRC rates of 10.75%, 35.75% and 39.35%, your effective rate, and the take-home pay left.