What is the CGT annual exempt amount?

It is the amount of capital gains you can make each year tax-free, set at 3,000 GBP for 2024-25 (down from 6,000 GBP in 2023-24 and 12,300 GBP before that). Only gains above this exemption are taxed.

What are the UK CGT rates?

For residential property, the rates are 18% within your basic-rate band and 24% above it. For other assets such as shares, the rates are 10% and 20%. The split point is wherever your other income uses up the basic-rate band.

How does my income affect my CGT rate?

Capital gains sit on top of your income. The basic-rate band runs to 37,700 GBP of taxable income. Any part of that band not used by your income is available for gains at the lower CGT rate; gains beyond it are taxed at the higher rate.

What is Business Asset Disposal Relief?

Business Asset Disposal Relief (formerly Entrepreneurs' Relief) charges qualifying business disposals at a flat 10% on up to a 1 million GBP lifetime limit, regardless of your income band. This calculator offers it as an option for the whole gain.

Do I still report a gain within the allowance?

If your total gains are within the annual exempt amount you usually have no CGT to pay, but property disposals must still be reported to HMRC within 60 days if there is tax due. Always check current HMRC reporting rules for your situation.

UK Capital Gains Tax Calculator

UK Capital Gains Tax depends on the asset type, your income, and the annual tax-free allowance. Gains stack on top of your income, so part may be taxed at the lower rate and part at the higher rate. This calculator splits the gain correctly.

How it works

taxable gain = max(0, gain − 3,000 annual exempt amount)
basic band left = max(0, 37,700 − taxable income)
lower portion   = min(taxable gain, basic band left)
higher portion  = taxable gain − lower portion

property rates  = 18% (lower) / 24% (higher)
other rates     = 10% (lower) / 20% (higher)
BADR            = flat 10% on the whole taxable gain

The “basic band left” is whatever remains of the 37,700 GBP basic-rate band after your other taxable income. Gains filling that space pay the lower rate; the rest pays the higher rate.

Example

A 40,000 GBP gain on shares with 30,000 GBP of taxable income. After the 3,000 GBP exemption, 37,000 GBP is taxable. The basic band has 7,700 GBP left, so 7,700 GBP is taxed at 10% (770 GBP) and 29,300 GBP at 20% (5,860 GBP) — total CGT 6,630 GBP.

Notes

Business Asset Disposal Relief applies only to qualifying business disposals up to a 1 million GBP lifetime limit and ignores your income band. This is an estimate; losses, reliefs, and the 60-day property reporting deadline are not modelled here.