CryptoTax UK · Guide
Selling crypto before the UK tax year end: the complete planning guide
The 5 April tax year deadline creates a genuine planning opportunity for UK crypto investors every year. Whether you want to use your CGT allowance, harvest losses, or time large disposals across two years — the weeks before 5 April are the most tax-efficient period to act. Here's exactly how to plan it. Educational only — not tax advice.
Calculate my position before 5 April →Why 5 April matters for crypto investors
The UK tax year runs from 6 April to 5 April. Every tax year, your £3,000 CGT allowance resets — any unused allowance is lost forever. Losses from one year can be carried forward but only if reported to HMRC. Large gains can be split across two years by timing your disposal carefully. These rules make the final weeks before 5 April one of the most important periods in the crypto tax calendar.
Using your CGT allowance before it expires
If you have made gains during the tax year but have not yet realised them (i.e. you still hold the assets), consider whether selling before 5 April to crystallise up to £3,000 of gains makes sense. If you want to stay invested, you can sell and buy back — but remember the 30-day bed and breakfast rule means you must wait 30 days before buying the same asset back, or use a different asset. Alternatively, a spouse can immediately buy the same asset on the same day (the 30-day rule applies to the same individual, not between spouses).
Harvesting losses before 5 April
If you hold assets sitting at a loss, selling them before 5 April crystallises those losses in the current tax year — where they can offset gains from the same year, potentially reducing your tax bill significantly. If you have more losses than gains in the year, the excess losses carry forward to future years. You must report the losses on your Self Assessment return for them to be usable — they do not carry forward automatically.
Splitting large disposals across two tax years
If you are planning to sell a large crypto holding, splitting the disposal across 5 April can use two years' worth of CGT allowances and potentially keep part of the gain in a lower tax band. For example, selling half before 5 April and half after 6 April uses £3,000 of allowance in each year. With CGT rates of 18–24%, careful timing of a £50,000 gain could save several thousand pounds in tax.
Practical steps for year-end crypto planning
In the weeks before 5 April: calculate your total gains and losses to date using a UK crypto tax calculator; identify assets sitting at a loss that could be harvested; check whether you have used your CGT allowance; consider whether any transfers to a spouse make sense; ensure any sales are settled and confirmed before midnight on 5 April — exchange settlement times vary, so act a few days early to be safe.
Frequently asked questions
If I sell crypto on 5 April, what date counts for tax purposes?
For CGT purposes, the disposal date is the date the contract is made — i.e. the trade date on the exchange, not the settlement date. So a sale executed on 5 April counts in the 2024/25 tax year even if the funds settle later. Act before midnight on 5 April to be safe.
Can I transfer crypto to my ISA before 5 April to shelter future gains?
You cannot transfer crypto directly into an ISA. However, if you sell crypto and reinvest the proceeds into a Stocks and Shares ISA before 5 April (subject to the £20,000 annual ISA allowance), future gains on those investments grow tax-free. This is a legitimate and commonly used strategy — but note that the sale itself may trigger CGT.
I have made a large gain this year — is it too late to do anything?
Not necessarily. Even close to 5 April, you can still: transfer assets to a spouse to use their CGT allowance; sell loss-making assets to offset the gain; consider whether any assets qualify for gift relief or other reliefs. The earlier you plan, the more options you have — but last-minute action is still better than none.
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Calculate my position before 5 April →Educational guidance only. CryptoTax UK is not a regulated tax adviser and the information above does not constitute tax, legal or financial advice. Always confirm your specific position with HMRC or a qualified accountant before filing.