Crypto Tax Loss Harvesting Calculator
This crypto tax-loss harvesting calculator helps UK investors understand how realising cryptocurrency losses can reduce their overall Capital Gains Tax exposure. By modelling your realised gains, unrealised losses, and annual CGT allowance, the tool estimates how much tax you may be able to offset for the 2024/2025 tax year.
Tax-loss harvesting is an HMRC-recognised approach where investors dispose of loss-making assets to create allowable capital losses. These losses can then be used to offset current-year gains, or carried forward to future years if reported correctly. With the UK CGT allowance now reduced to £3,000, using losses efficiently has become increasingly important for active crypto investors.
This calculator is free to use and designed to help you better understand your potential tax position before speaking with a qualified accountant or tax advisor. It does not provide financial or tax advice, and individual circumstances may vary.
Calculate Your Tax Savings
Enter your capital gains and unrealised losses to see how much tax you can save.
This tool provides illustrative estimates only and does not account for all HMRC pooling and anti-avoidance rules. Always confirm calculations with a qualified tax adviser before acting.
All crypto profits realised this tax year
Determines your CGT rate on crypto
Your Unrealised Losses
Need Help Implementing This Strategy?
Our crypto tax specialists can help you execute tax loss harvesting correctly, ensure HMRC compliance, and maximise your savings.
Book Free Tax Strategy Call →How Crypto Tax Loss Harvesting Works
Tax loss harvesting is a legal strategy where you sell cryptocurrencies that have decreased in value to realize capital losses. These losses can then offset your capital gains, reducing your overall tax bill.
✅ What You Can Do
- • Sell crypto at a loss to realize the loss
- • Offset losses against gains in same tax year
- • Carry forward unused losses indefinitely
- • Rebuy the same crypto after 30 days
- • Harvest losses before April 5th deadline
⚠️ Important Rules
- • Wait 30 days to avoid "bed and breakfasting"
- • Keep detailed transaction records
- • Report on Self Assessment if required
- • Consider same-day and 30-day pooling rules
- • Do not manufacture artificial losses
Step-by-Step Process
Identify Unrealised Losses
Review your portfolio and find cryptocurrencies currently trading below your purchase price.
Calculate Potential Savings
Use this calculator to see how much tax you could save by harvesting specific losses.
Sell to Realise Losses
Execute the sales on your exchange, documenting the date, amount, and price.
Wait 30 Days (If Rebuying)
To avoid HMRC's "bed and breakfasting" rules, wait at least 30 days before repurchasing the same crypto.
Report on Self Assessment
Include your realised losses when filing your Self Assessment tax return.
Example Scenarios
Scenario 1: Basic Loss Harvesting
Situation: You have £10,000 in gains and £4,000 in unrealised losses
Action: Sell positions with £4,000 loss
Result: £10,000 - £4,000 - £3,000 allowance = £3,000 taxable
Savings: £800 (at 20% rate) vs £1,400 without harvesting
Scenario 2: Complete Offset
Situation: £8,000 gains, £6,000 unrealised losses
Action: Harvest £5,000 of losses (keep £1,000 for next year)
Result: £8,000 - £5,000 = £3,000 (within allowance)
Savings: £1,000 (entire tax bill eliminated)
Scenario 3: Loss Carryforward
Situation: £5,000 gains, £10,000 unrealised losses
Action: Harvest £5,000 losses now, save £5,000 for future years
Result: £0 taxable this year, £5,000 loss to carry forward
Savings: £400 now + future year benefits
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This calculator is for informational purposes only and does not constitute financial or tax advice. Cryptocurrency tax laws are complex and subject to change. Tax loss harvesting requires careful planning and proper execution. Improper execution may result in penalties, disallowed losses, or tax evasion charges. Information provided may be outdated or incomplete. Always consult with qualified crypto tax advisors or accountants familiar with HMRC regulations before making any tax-related decisions. This tool does not constitute a recommendation to engage in tax loss harvesting.