Capital Gains Tax (UK) Calculator

Sale price minus purchase price and allowable costs.
Of the £3,000 annual exempt amount, how much you've already used this year.
Finance

Estimate the UK Capital Gains Tax on a profit from selling shares or property. Enter your total gain, your tax band, and the asset type, and this calculator subtracts the annual exempt amount and applies the right CGT rate to show the tax due. Figures use the £3,000 annual allowance.

Formula

Taxable gain = gain − remaining allowance; CGT = taxable gain × rate
  • Everyone gets an annual exempt amount (the CGT allowance) of £3,000 for 2024-25 — gains up to this are tax-free.
  • Only the gain above your remaining allowance is taxed.
  • Shares and most assets are taxed at 10% (basic-rate taxpayers) or 20% (higher/additional-rate).
  • Residential property is taxed at 18% (basic-rate) or 24% (higher-rate).
  • Your tax band is decided by your total income plus the taxable gain, so a large gain can push part of it into the higher rate.
  • This is a simplified estimate; it doesn't model the band-straddling split or reliefs like Private Residence Relief.

£20,000 gain on shares, higher-rate taxpayer

Inputs
  • Total Capital Gain (£): 20000
  • Annual Allowance Already Used (£): 0
  • Your Income Tax Band: higher
  • Asset Type: shares

Taxable gain = £20,000 − £3,000 allowance = £17,000. At the 20% higher rate for shares, CGT = £17,000 × 0.20 = £3,400.

Frequently asked questions

What is the UK capital gains tax allowance?
For 2024-25 the annual exempt amount is £3,000. Total gains up to this in a tax year are free of CGT; only gains above it are taxed.
What are the current CGT rates?
Shares and most assets: 10% for basic-rate taxpayers, 20% for higher/additional-rate. Residential property: 18% (basic) or 24% (higher). Your income determines which rate applies.
How is my tax band decided for CGT?
Add the taxable gain to your taxable income. The part of the gain falling within the basic-rate band is taxed at the lower rate, and anything above at the higher rate. This calculator uses a single band for simplicity.
Do I pay CGT on my home?
Usually not. Private Residence Relief generally exempts the gain on your main home. CGT on property mainly affects second homes and buy-to-let, which this calculator covers.
How do I work out my gain?
Take the sale price, subtract what you paid plus allowable costs (such as buying/selling fees and qualifying improvements). The result is the gain you enter here.