UK Capital Gains Tax Calculator 2025/26

How UK Capital Gains Tax works

Capital Gains Tax (CGT) is charged on the profit when you sell an asset that has increased in value. In 2025/26, the first £3,000 of gains is tax-free (the annual exempt amount). This was reduced from £6,000 in 2023/24 and £12,300 in 2022/23.

CGT rates depend on the type of asset. For shares, crypto, and other assets, the rates are 10% (basic rate) and 20% (higher rate). For residential property, the rates are higher: 18% (basic rate) and 24% (higher rate).

Your gains sit on top of your other income when determining which tax band applies. If your salary already pushes you into the higher rate band, your entire gain will be taxed at the higher rate.

What is exempt from CGT?

Your main home is usually exempt from CGT under Private Residence Relief (PRR). Assets held in ISAs and pensions are also exempt. Transfers between spouses or civil partners are not taxable events. Cars are exempt, and personal possessions worth less than £6,000 when sold are also exempt.

Reporting and payment deadlines

For most assets, you report and pay CGT through your Self Assessment tax return by 31 January following the end of the tax year. For UK residential property disposals, you must report and pay within 60 days of completion.