Capital Gains Tax Calculator UK 2025–26
Calculate your Capital Gains Tax liability for 2025–26. Enter your total gain, any allowable losses, and your other income to see CGT at the correct rate.
How Capital Gains Tax works in 2025–26
Capital Gains Tax (CGT) is charged on the profit (the “gain”) made when you sell or dispose of an asset that has increased in value. Common disposals include shares held outside an ISA, investment properties, and business assets. Your main home is generally exempt under Principal Private Residence Relief.
The annual exempt amount
Every UK resident receives an annual exempt amount — the first £3,000 of gains each tax year is completely free of CGT. Allowable losses from the same year are applied first, and then the exempt amount is applied to the remaining gain. The exempt amount has been progressively reduced from £12,300 (2022-23), making careful use of it each year increasingly important.
Unified CGT rates from October 2024
The October 2024 Autumn Budget unified CGT rates across all asset classes. Previously, residential property was taxed at 18% (basic rate) and 28% (higher rate), while other assets were charged at 10% and 20%. From 30 October 2024, a single set of rates applies to all assets:
- 18% for gains within the basic rate band
- 24% for gains above the basic rate threshold
Business Asset Disposal Relief (formerly Entrepreneurs' Relief) continues to apply a 10% rate on qualifying business disposals, subject to a lifetime allowance of £1 million. This calculator does not cover BADR — if you are selling a business, speak to a tax adviser.
How gains stack on top of other income
Like dividends, capital gains sit on top of all other income for the purposes of determining which rate band they fall into. Your personal allowance (£12,570) and basic rate band are first used by salary, pension, or other income. How much basic rate band remains determines the proportion of your gain taxed at 18% versus 24%.
For example, if your salary is £40,000, you have used £27,430 of the basic rate band. The remaining £10,270 of basic rate band is available for gains. The first £3,000 of gains is covered by the annual exempt amount, the next £10,270 is taxed at 18%, and any further gain is taxed at 24%.
Reporting and paying CGT
For residential property disposals, you must report the gain and pay any CGT within 60 days of completion. For other assets, CGT is reported and paid via Self Assessment — by 31 January following the end of the tax year in which the disposal took place.
Frequently asked questions
What is the annual exempt amount for CGT in 2025-26?
The CGT annual exempt amount (AEA) for 2025-26 is £3,000. This is the total amount of capital gains you can make in a tax year before paying any CGT. The AEA has been reduced significantly from £12,300 in 2022-23 to £6,000 in 2023-24, and then to £3,000 from 2024-25. If your total gains in the year are below £3,000, you owe no CGT.
What CGT rates apply in 2025-26?
Following the October 2024 Budget, a single set of CGT rates applies to all assets. Basic rate taxpayers pay 18% on gains that fall within the basic rate band. Higher rate taxpayers, or gains that push total income into the higher rate band, pay 24%. These unified rates replaced the old residential property rates (18%/28%) and other assets rates (10%/20%), which no longer apply.
How does my other income affect which CGT rate I pay?
Gains are treated as the top slice of your income — they sit on top of your salary, pension, or other income. If your total income (salary plus gains) stays within the basic rate band (up to £50,270 of total income), gains are taxed at 18%. Any portion of gains that pushes you above £50,270 is taxed at 24%. The calculator accounts for how much basic rate band remains after your other income.
Can I offset capital losses against my gains?
Yes. Capital losses from the disposal of assets in the same tax year are automatically offset against gains before the annual exempt amount is applied. Unused losses from prior years can be carried forward indefinitely and used in future years. You must report losses to HMRC within four years of the end of the tax year in which they arose to claim them.
Do I need to report gains below the annual exempt amount?
If your total proceeds from all disposals in the year exceed four times the annual exempt amount (£12,000 in 2025-26), you must report them via Self Assessment even if no CGT is due. If you are already registered for Self Assessment, include all disposals on your return. Gains within an ISA or pension are never subject to CGT.
Related calculators
This calculator provides estimates only. Results are based on the 2025–26 tax year. Credibrate is not a tax adviser. For personalised advice speak to a qualified accountant.