UK Crypto Tax Calculator - Calculate Capital Gains Tax 2025/26
Free calculator to determine UK cryptocurrency Capital Gains Tax for 2025/26 using accurate HMRC rates and the latest tax regulations
UK Crypto Tax Calculator
Tax Liability
What is UK Cryptocurrency Tax?
UK Cryptocurrency Tax refers to the Capital Gains Tax (CGT) and Income Tax obligations on crypto assets following HMRC regulations for the 2025/26 tax year. When you dispose of cryptocurrency through selling, trading, or spending, you may owe tax on the profits.
This calculator helps you calculate tax for:
- Capital Gains - Tax on profits from selling or trading crypto (18% or 24% rate)
- Crypto Trading - Calculate CGT on Bitcoin, Ethereum, and all cryptocurrencies
- Mining & Staking Income - Income tax at 20%, 40%, or 45% on crypto earnings
- £3,000 Allowance - Annual tax-free CGT allowance for 2025/26
- Allowable Costs - Deduct transaction fees, gas fees, and exchange costs
Planning your overall UK tax? Use our UK Tax Calculator to understand your complete income tax and National Insurance position.
Need to calculate take-home pay? Our UK PAYE Salary Calculator shows your net income after all deductions.
Property investment? Check our SDLT Calculator for Stamp Duty Land Tax calculations.
How Crypto Tax is Calculated
The calculation follows HMRC guidelines for 2025/26:
Step-by-step calculation:
- Step 1: Calculate total capital gains from crypto disposals
- Step 2: Subtract capital losses and allowable costs (fees)
- Step 3: Deduct £3,000 annual CGT allowance
- Step 4: Apply 18% (basic rate) or 24% (higher/additional rate)
- Step 5: Add income tax on mining/staking earnings (20%, 40%, or 45%)
2025/26 Tax Rates:
- CGT Allowance: £3,000 (down from £6,000 in 2023/24)
- Basic Rate CGT: 18% (income up to £50,270)
- Higher/Additional Rate CGT: 24% (income over £50,270)
- Crypto Income Tax: 20%, 40%, or 45% based on total income
Key Crypto Tax Concepts Explained
Section 104 Pooling
HMRC uses average cost basis for crypto holdings. Each token type has its own pool with an averaged cost per token.
Same Day Rule
Sales are first matched with purchases made on the same day, using the actual cost from that day rather than the pool average.
Bed & Breakfast Rule
If you repurchase within 30 days of selling, the sale is matched with the new purchase, preventing tax loss harvesting.
Allowable Costs
Transaction fees, exchange fees, gas fees, and professional advice costs can all be deducted from your capital gains.
Real-World Crypto Tax Examples
Example 1: Basic Rate Taxpayer
Gains: £10,000 | Losses: £0 | Costs: £200 | Income: £35,000
CGT = (£10,000 - £0 - £200 - £3,000) × 18% = £1,224
Example 2: Higher Rate Taxpayer
Gains: £25,000 | Losses: £5,000 | Costs: £500 | Income: £75,000
CGT = (£25,000 - £5,000 - £500 - £3,000) × 24% = £3,960
Example 3: With Mining Income
Gains: £8,000 | Mining Income: £5,000 | Income: £60,000
CGT = (£8,000 - £3,000) × 24% = £1,200 | Income Tax = £5,000 × 40% = £2,000
Total: £3,200
How to Use This Calculator
Enter Gains & Losses
Input total capital gains and losses from crypto sales
Select Income Band
Choose your income tax band for correct CGT rate
Add Costs & Income
Include fees and any mining/staking income
View Tax Breakdown
See complete tax liability with detailed breakdown
Benefits of Using This Calculator
- • Accurate 2025/26 Rates: Uses latest HMRC CGT rates (18%/24%) and £3,000 allowance.
- • Complete Tax Picture: Calculate both capital gains tax and income tax on crypto earnings.
- • Include Allowable Costs: Deduct exchange fees, gas fees, and transaction costs to reduce tax.
- • Tax Planning Tool: Understand your crypto tax liability before filing your Self Assessment.
- • Instant Results: Real-time calculations showing total tax owed with full breakdown.
Factors That Affect Your Crypto Tax
1. Your Income Level
Basic rate taxpayers pay 18% CGT while higher/additional rate taxpayers pay 24%, making a significant difference on large gains.
2. Holding Period
The Bed & Breakfast rule affects sales within 30 days of purchase, potentially increasing your tax if you trade frequently.
3. Transaction Costs
Higher transaction fees, gas fees, and exchange costs reduce your taxable gains and lower your overall tax liability.
4. Capital Losses
Losses from previous years can be carried forward indefinitely to offset future gains and reduce tax liability.
5. Timing of Disposals
Strategic timing of sales across tax years can maximize use of your annual £3,000 allowance and minimize tax owed.
HMRC Reporting Requirements 2025/26
When you must report crypto on your tax return:
- Total proceeds from crypto sales exceed £50,000 in the tax year
- Taxable gains (after losses and allowance) exceed the £3,000 CGT allowance
- You have crypto income from mining, staking, or airdrops to report
New 2026 Requirements:
- From January 2026, you must provide personal details to all crypto exchanges
- Exchanges will report your holdings to HMRC from 2026 calendar year
- Non-compliance can result in £300 penalty
- Deadlines: October 31 (paper) or January 31 (online) after tax year ends
Frequently Asked Questions (FAQ)
Q: How is cryptocurrency taxed in the UK for 2025/26?
A: Cryptocurrency is subject to Capital Gains Tax when you dispose of it (sell, trade, or spend). For 2025/26, you pay 18% CGT as a basic rate taxpayer or 24% as a higher/additional rate taxpayer on gains above the £3,000 annual allowance. Crypto income from mining or staking is taxed as income at 20%, 40%, or 45%.
Q: What is the UK crypto tax-free allowance for 2025/26?
A: The Capital Gains Tax allowance for 2025/26 is £3,000. This applies to all capital gains combined, not just cryptocurrency. You only pay tax on crypto gains exceeding this amount. This is a significant reduction from £6,000 in 2023/24.
Q: What are the CGT rates for crypto in the UK?
A: From October 30, 2024, crypto CGT rates are 18% for basic rate taxpayers (income up to £50,270) and 24% for higher/additional rate taxpayers (income over £50,270). Transactions before this date used the old rates of 10% and 20%.
Q: How does HMRC calculate crypto capital gains?
A: HMRC uses three matching rules in order: Same Day Rule (match sales with purchases on the same day), Bed & Breakfast Rule (match with purchases within next 30 days), and Section 104 Pooling (average cost basis for remaining holdings). This determines your cost basis for calculating gains.
Q: Do I need to report crypto on my UK tax return?
A: Yes, if your total proceeds (sales) exceed £50,000 or your taxable gains exceed the £3,000 allowance, you must report it on your Self Assessment tax return. From 2026, crypto exchanges will automatically report your holdings to HMRC, with penalties up to £300 for non-compliance.
Q: Are crypto transaction fees tax deductible?
A: Yes, you can deduct allowable costs including exchange fees, transaction fees, gas fees, and costs of professional advice when calculating your capital gains. These costs reduce your taxable gain and lower your overall tax liability.