Capital Gains Tax £3,164. Gain after tax £16,836.
After the £3,000 allowance, £17,000 is taxable. £15,270 falls in your remaining basic-rate band (18%) and £1,730 above it (24%), giving an estimated £3,163.80 of Capital Gains Tax.
How your Capital Gains Tax is worked out
| Total gain | £20,000.00 |
| Less annual exempt amount | −£3,000.00 |
| Taxable gain | £17,000.00 |
| Basic rate (18%) on £15,270 | £2,748.60 |
| Higher rate (24%) on £1,730 | £415.20 |
| Capital Gains Tax | −£3,163.80 |
| Gain after tax | £16,836.20 |
The annual exempt amount is £3,000 for 2026/27. Gains are taxed at 18% to the extent they fit in your remaining basic-rate band and 24% above it — the same rates for shares and residential property. Your CGT is paid separately from income tax (property gains within 60 days of completion).
Example gains (your income & asset)
CGT at £35,000 income. Tap to load a gain.
Frequently asked questions
What are the Capital Gains Tax rates for 2026/27?
For 2026/27, gains are taxed at 18% to the extent they fall within your remaining basic-rate band and 24% above it. From 6 April 2026 these rates are the same for shares, funds and other assets and for residential property. Gains are added on top of your income to decide which rate applies.
What is the Capital Gains Tax allowance?
The annual exempt amount is £3,000 for 2026/27 (down from £6,000 in 2023/24 and £12,300 before that). You only pay CGT on gains above this amount in the tax year, after deducting any allowable losses.
How is Capital Gains Tax calculated?
Work out your gain (sale price minus cost and allowable expenses), deduct any losses and then the £3,000 allowance. The remaining gain is added on top of your taxable income: the part within your remaining basic-rate band is taxed at 18%, and the part above it at 24%.
Do I pay Capital Gains Tax when I sell my home?
Usually not. Selling your only or main home is normally covered by Private Residence Relief, so there is no CGT. You may have to pay if you let it out, used part of it for business, or it sits on very large grounds. Second homes and buy-to-let properties are chargeable.
When do I report and pay Capital Gains Tax?
For UK residential property you must report and pay within 60 days of completion using HMRC’s online service. Other gains (shares, funds) are usually reported through your Self Assessment tax return by 31 January after the tax year.
Related calculators & guides
Sources — official UK figures
A simplified estimate using 2026/27 Capital Gains Tax rates and the £3,000 annual exempt amount. It assumes UK residence and standard rates; it does not cover Business Asset Disposal Relief (a reduced rate up to a £1m lifetime limit), Investors' Relief, gifts, trusts, non-residents, or the Private Residence Relief that usually makes your main home exempt. Report and pay CGT through Self Assessment, or within 60 days for UK residential property. For an exact figure, speak to an accountant.