Do I have to file Self Assessment for crypto? UK rules 2026

Most UK crypto investors do not need to file a Self Assessment — but if your gains exceed the £3,000 Annual Exempt Amount, your total disposal proceeds top £50,000, or you earned more than £1,000 of crypto income, you do. CARF reporting in 2026 means HMRC increasingly sees the data anyway, so getting this judgement right is worth a few minutes of attention.

Do I need to file Self Assessment for crypto?

The CGT thresholds: £3,000 and £50,000

Two separate thresholds, easily confused. Both can trigger a filing requirement on their own:

• £3,000 — the gain threshold. If your total taxable capital gain across all assets (not just crypto) is above £3,000 for 2025/26, CGT is due and Self Assessment is required.
• £50,000 — the proceeds threshold. If your total disposal proceeds (not gain — proceeds, the full amount you sold for) exceed £50,000 across all chargeable assets, you must report on Self Assessment even if the gain was below £3,000 and no tax is due. This is a reporting-only requirement.

Worked example: an investor sold 2 BTC for £58,000 having bought them for £55,000. Gain is £3,000 — exactly the AEA, no tax due. But proceeds exceed £50,000, so Self Assessment is required to report the disposals on SA108.

The £50,000 proceeds threshold catches more crypto investors than they expect. A buy-and-hold investor who rotates a single position once in the year can easily clear it without owing a penny in tax.

Income from staking, mining, airdrops

Crypto income is taxable as miscellaneous income (or trading income, in rare cases) and follows different rules from CGT. The income event happens at receipt, valued in GBP at the spot rate on the day:

• Staking rewards. Treated as miscellaneous income at GBP value on receipt. Pooled with other miscellaneous income for the £1,000 trading allowance.
• Mining rewards. Income on receipt; if scaled up (rigs, electricity costs claimed), HMRC may treat it as trading income subject to NICs.
• Airdrops. Taxable as income only if you did something to earn them (joined a Discord, completed a quest, held a particular wallet at snapshot for promotional purposes). Genuine giveaways with no quid pro quo can fall outside income — but the line is fact-specific.
• Lending interest. Income on accrual.
• Crypto received as payment for services.Income at GBP value on receipt; if you're self-employed, also subject to NICs.

If your total crypto income (plus any other miscellaneous income) is under £1,000, the trading allowance covers it and no return is required for that income alone. Above £1,000, the full amount is taxable and Self Assessment is due.

If you already file Self Assessment

For self-employed people, landlords, higher-rate taxpayers receiving dividends, and anyone else already inside Self Assessment, the question is moot — you must include any crypto activity on the return regardless of the thresholds above. Capital gains go on SA108; income goes on SA100 box 17 (other taxable income) or SA103 (self-employment) depending on the facts.

The thresholds in this article only apply to people deciding whether to register for Self Assessment in the first place.

The £1,000 trading allowance

The trading allowance is a £1,000 tax-free band for casual self-employed-style income — eBay sellers, Airbnb hosts, occasional consultants. It also covers small crypto income from staking and airdrops where no formal trade is being run.

Two practical points. First, the allowance is shared with all miscellaneous income, not just crypto. £600 of Etsy income plus £500 of staking puts you over the threshold. Second, you can't claim the allowance and deduct expenses on the same income — you choose one or the other.

For most crypto investors with modest staking yields, the allowance neatly covers the income and avoids a Self Assessment registration. Active stakers earning above £1,000 will need to file.

How to register if you need to

1. Register for Self Assessment online at gov.uk/register-for-self-assessment by 5 October following the tax year (so 5 October 2026 for 2025/26).
2. Receive your Unique Taxpayer Reference (UTR) by post — this can take up to 10 working days.
3. File the return online by 31 January (so 31 January 2027 for 2025/26). Paper filers must submit by 31 October.
4. Pay any tax due by 31 January.

Run your portfolio through Koinlyor another tool first to confirm whether you actually need to register. The free preview is enough for most casual investors to confirm they're below the thresholds.

Summary

Three triggers for filing: gains above £3,000, proceeds above £50,000, or income above £1,000. If any apply, register by 5 October following the tax year and file by 31 January. If none apply and you don't already file Self Assessment for another reason, you're fine.

For deadline detail and penalties, see when to report crypto on taxes. For the form itself, see our walk-through of SA108 for crypto. The full rulebook lives in our UK crypto tax guideand HMRC's own manual at gov.uk/hmrc-internal-manuals/cryptoassets-manual.