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Nine tools for the UK crypto tax questions people actually ask.

Every tool on this page runs entirely in your browser. Your figures are never transmitted to us, never stored and never logged, because the arithmetic happens on your own machine and there is nowhere for the numbers to go. No account, no email, no trial. Where a tool rests on statute, the section is named and linked on the page, and where it uses a published figure, GOV.UK is cited with the date it was checked.

These answer one question at a time. When you need the whole year computed, matched under the same-day, 30-day and section 104 rules with a citation on every disposal, that is the app, free under 1,000 transactions.

Calculators, answers from your own numbers

Type figures in, read the answer, close the tab. Nothing is transmitted, stored or logged, which you can check in your browser network tab.

Capital gains tax calculator Correct allowances and rates for every year back to 2021, including the October 2024 mid-year change, with every step of the working shown. Work out the tax Crypto profit calculator Profit with fees, break-even and target prices, then an estimate of the UK tax on it. Plus why profit is not the same thing as your taxable gain. Work out the profit The 30-day rule calculator Count the first clear rebuy day for any sale date, and see exactly what the matching does to your numbers if you go early. Count the window

Planning and timing, decisions with a date on them

Four things that change your bill without changing what you own. Each page states the statute it rests on and links the source.

Sell now or after 5 April The tax year boundary changes which allowance covers the gain, which rate band it meets, and when the tax falls due. How to price both sides. Price both sides Loss harvesting before 5 April Realising losses cuts the bill, if you respect the 30-day rule, claim properly, and never harvest into the £3,000 allowance. Find the saving Spouse and civil partner transfers No gain, no loss under section 58 TCGA 1992. How the base cost travels, why the disposal then meets a second allowance, and the traps. Compare the split Negligible value claims for dead tokens Rugged, delisted, abandoned. A token that died in your wallet can still cut the bill through a section 24(2) claim. Value the claim

Allowances and dates, the reference pages

The figures and deadlines a UK crypto holder needs, kept current and sourced to GOV.UK.

CGT allowance 2026/27 The annual exempt amount is £3,000 and it does not roll over. What counts toward it, the rates above it, and how much of yours is left. Track your allowance Crypto tax deadlines Every self assessment date that matters, registration by 5 October 2026, paper by 31 October, online filing and payment by 31 January 2027. See the countdown

Every figure on these pages is checked against the source and dated. The engine behind the full app publishes its own test record, all 29 rules with the statute and the HMRC worked example each one is tested against, on the verification page. General information, not personal tax advice.