UK Capital Gains Crypto Calculator

Add your crypto disposals for the tax year to net gains against losses, apply the £3,000 allowance and estimate your Capital Gains Tax, using 2026 to 2027 rates.

Your disposals this tax year

Add one row for each sale, swap or other disposal. Empty rows are ignored.

Tax Settings

Your income for the tax year before tax, not counting these gains.

Capital losses from earlier tax years that you have reported and not yet used.

Your capital gains

Fill in your disposals and choose Calculate Capital Gains. Your figures appear here.

Total Gains

£0.00

Disposals that made a gain

Total Losses

£0.00

Disposals that made a loss

Net Gain / Loss

£0.00

Total gains − total losses

Tax-Free Allowance Used

£0.00

Up to £3,000 of gains a year

Taxable Gain

£0.00

Net gain − earlier losses − allowance

Capital Gains Tax

£0.00

18% or 24% of the taxable gain

An estimate for the 2026 to 2027 tax year. It uses the cost you enter for each disposal, so apply HMRC's pooling, same-day and 30-day rules first. For a single trade with charts, use the UK Crypto Tax Calculator.

How it is calculated

All your disposals for the tax year are netted into one figure before any tax is worked out.

  • Gain or loss on a disposal = proceeds − allowable cost
  • Net gain = total gains − total losses in the same tax year. Same-year losses are always used in full
  • Earlier losses = used only to bring the net gain down to the £3,000 allowance, never below it
  • Taxable gain = net gain − earlier losses used − the £3,000 tax-free allowance
  • Capital Gains Tax = 18% of the taxable gain that fits in what is left of the £37,700 basic rate band, and 24% of the rest
  • Losses to carry forward = any net loss for the year, plus earlier losses you did not need to use

Frequently asked questions

Short answers on working out Capital Gains Tax across a year of crypto disposals.

Work out the gain or loss on each disposal, which is the proceeds minus the allowable cost. Add up the gains, add up the losses, and subtract one from the other. The tax year runs from 6 April to 5 April.

Yes. A loss you report is deducted from the gains you made in the same tax year, in full, even if that takes your gains below the £3,000 allowance.

Only if your gain is still above the tax-free allowance after same-year losses. Earlier losses then reduce the gain down to the allowance, and anything left over stays available for future years. The allowance is never wasted on earlier losses.

What you paid for the tokens, worked out using HMRC's pooling, same-day and 30-day rules, plus transaction fees for buying and selling. This calculator uses the cost you enter for each disposal, so apply those rules before you fill it in.

Yes. The £3,000 allowance covers your total gains across all assets in the tax year. Gains and losses on shares can be added as extra rows, because they use the same allowance and the same 18% and 24% rates.

Report gains in a Self Assessment tax return, or through HMRC's real time Capital Gains Tax service by 31 December after the tax year ends. Report losses too if you want to use them: you can claim a loss up to four years after the end of the tax year in which it happened.

More crypto calculators