Crypto Tax Savings Estimator
This crypto tax savings estimator helps UK investors understand how much capital gains tax they could legally save using proven strategies. Enter your planned gains, any unrealised losses, and your tax details to see a personalised breakdown of potential savings.
Our crypto tax optimisation tool models four key strategies used by UK investors: tax-loss harvesting, annual allowance spreading, spouse transfers, and income band optimisation. Each strategy is calculated independently so you can see exactly where the savings come from.
How the Estimator Works
Strategy 1: Tax-Loss Harvesting
If you hold crypto positions that are currently worth less than you paid for them, you can sell those positions to "realise" the loss. These realised losses offset your capital gains in the same tax year, reducing your taxable gain and therefore your tax bill.
- Losses can be carried forward indefinitely to future tax years
- You must report losses to HMRC within 4 years of the tax year they occurred
- Be aware of the "bed and breakfasting" rule — you cannot repurchase the same asset within 30 days
Strategy 2: Annual Allowance Spreading
Every UK taxpayer gets a £3,000 CGT allowance each tax year (2024/25). By spreading your disposals across multiple tax years instead of selling everything at once, you can use the full allowance each year, significantly reducing the amount of gain that's actually taxable.
Strategy 3: Spouse / Civil Partner Transfer
Transfers between spouses and civil partners are not taxable events in the UK. By transferring crypto to your partner before disposal, they can use their own £3,000 CGT allowance — effectively doubling the household allowance to £6,000. Your partner must genuinely own and control the asset.
Strategy 4: Income Band Optimisation
Higher/additional rate taxpayers pay 20% CGT on crypto, while basic rate taxpayers pay only 10%. By making pension contributions, charitable donations, or using salary sacrifice to reduce your taxable income below £50,270, you could halve your crypto CGT rate.
These strategies can often be combined. For example, you might harvest losses and spread the remaining gains across tax years while transferring some assets to your spouse. The estimator models each strategy independently — a tax professional can help you combine them optimally.
Example Calculations
Example 1: Basic Rate Taxpayer With Losses to Harvest
Tom has £20,000 in unrealised crypto gains and £8,000 in unrealised losses on altcoins.
- Without optimisation: (£20,000 − £3,000) × 10% = £1,700 tax
- After loss harvesting: (£20,000 − £8,000 − £3,000) × 10% = £900 tax
- Saving: £800
Result: Tom saves £800 by selling his underperforming altcoins in the same tax year.
Example 2: Higher Rate Taxpayer Using Spouse Transfer
Sarah (higher rate) has £15,000 in gains. Her husband hasn't used his CGT allowance.
- Without optimisation: (£15,000 − £3,000) × 20% = £2,400 tax
- Transfer £3,000-worth to spouse: he sells using his allowance tax-free
- Sarah sells remaining: (£12,000 − £3,000) × 20% = £1,800 tax
Result: Sarah saves £600 by using her husband's CGT allowance.
Example 3: Spreading Gains Over Multiple Tax Years
James has £12,000 in gains. Instead of selling all at once, he spreads over 4 tax years.
- All at once (basic rate): (£12,000 − £3,000) × 10% = £900 tax
- £3,000/year over 4 years: each year falls within the allowance = £0 tax
Result: James saves the entire £900 by being patient and selling £3,000 per tax year.
Want a Personalised Tax Strategy?
Our estimator gives you a starting point — but every investor's situation is different. Book a free 15-minute strategy call with an expert to discuss your specific portfolio, timing, and tax-saving opportunities.
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Frequently Asked Questions
How can I legally reduce my crypto tax in the UK?
Can I transfer crypto to my spouse to save tax?
What is the "bed and breakfasting" rule for crypto?
How much can I save by spreading sales across tax years?
Does reducing my income band affect my crypto tax rate?
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