Last updated: April 2026
Tax planning warning
This calculator estimates potential CGT savings from crystallising crypto losses. HMRC matching rules are complex, and selling then rebuying the same crypto within 30 days can defer the loss instead of harvesting it.
-£3,000.00
-£2,000.00
Harvest opportunity
£900.00
Estimated tax saving if you harvest £5,000.00 of losses.
322 days until 5 April, the UK tax year end. Losses must be crystallised before midnight on 5 April to count in that tax year.
| Asset | Loss | Tax saving | Priority | Rebuy after |
|---|---|---|---|---|
| BTC | -£3,000.00 | £540.00 | high | 18 Jun 2026 |
| ETH | -£2,000.00 | £360.00 | medium | 18 Jun 2026 |
After harvesting, wait at least 31 days before rebuying the same cryptoasset. If you rebuy within 30 days, the loss disposal is matched against the new acquisition and the tax benefit is deferred. Safe rebuy date: 18 Jun 2026.
Losses above your gains this year can be carried forward indefinitely to offset future gains. Estimated carry-forward losses if all listed losses are crystallised: £0.00. These losses must be reported to HMRC.
Tax loss harvesting involves selling cryptocurrency that has declined in value to realise a capital loss. This loss can offset capital gains in the same tax year, reducing your CGT bill. After more than 30 days, you can rebuy the same asset if you want to maintain your position.
Yes. HMRC 30-day matching rules mean that if you sell a crypto asset at a loss and rebuy the same asset within 30 days, the disposal is matched against the new acquisition, effectively deferring the loss rather than crystallising it. To harvest the loss, wait more than 30 days or buy a different asset.
Yes. Capital losses that exceed your gains in a tax year can be carried forward indefinitely to offset future capital gains. You must report those losses to HMRC within the relevant time limit; unreported losses are not applied automatically.
This calculator is designed to help you understand the likely number before you make a decision or start an application.
Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.
Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.
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