5 Best Crypto Tax Calculator for the UK in 2026

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Introduction

His Majesty’s Revenue and Customs (HMRC) treats every disposal of crypto as a taxable event. Selling for GBP, swapping one token for another, and spending crypto on goods all attract capital gains tax (CGT) if disposed of on profits. The tax owed depends on CGT rates of 10% or 20%, the £3,000 annual exempt amount, the Section 104 pooling rule for cost basis, and the 30-day bed-and-breakfasting rule. Getting any one of these wrong means filing an incorrect Self Assessment return.

UK-specific rules are precise enough that a generic calculator built for another jurisdiction produces the wrong figure. This guide compares five free tools that apply HMRC rules, so you can pick the one that fits how you trade before Self Assessment opens.

5 Best Free Crypto Tax Calculators for the UK: A Comparison

Each tool handles UK rules differently, from a single-trade estimate that applies the CGT exempt amount to a full platform that applies Section 104 pooling across an imported transaction history.

Top Free Crypto Tax Calculators for the UK in 2026

The five tools below all apply HMRC rules, but each one works differently once you look past the headline CGT rates. The breakdown covers what each calculator actually computes, what it requires as input, and what comes after the estimate.

KoinX

KoinX’s free crypto tax calculator for the UK applies the CGT rate and £3,000 annual exempt amount to a single trade immediately, without a signup. The full platform connects 800+ exchanges and wallets, applies Section 104 pooling to calculate the correct cost basis across a full imported transaction history, and generates HMRC-compliant reports. It also covers crypto derivatives, giving UK investors one place to handle both spot activity and futures positions for Self Assessment.

Why Choose KoinX?

• Instant Free Estimate: Returns a CGT figure on a single trade in seconds, no account needed.
• Section 104 Pooling Applied: Calculates cost basis using HMRC’s pooling method across the full transaction history.
• 800+ Exchange and Wallet Sync: Imports data from UK exchanges and global platforms.
• HMRC-Compliant Reports: Generates Self Assessment-ready reports covering CGT and crypto income.
• Covers Crypto Derivatives: Handles futures alongside spot trades in one report.

Taxfix

Taxfix’s calculator takes inputs for trading profit, staking income, mining income, and other income, then applies CGT at 10% or 20% against the £3,000 exempt amount. It also applies the £1,000 trading allowance for staking and mining, calculates National Insurance on relevant income, and includes a savings planner showing how much to set aside per day, week, or month to meet the 31 January Self Assessment deadline.

Why Choose Taxfix?

• Income Tax and NI Included: Calculates NI on staking and mining income alongside CGT on trading.
• Trading Allowance Applied: Accounts for the £1,000 tax-free threshold on staking and mining.

The Accountancy Partnership

The Accountancy Partnership’s calculator accepts trading income, mining income, staking income, other income, expenses, and a tax year selector from 2022-23 through 2026-27. It calculates CGT, income tax, and Class 4 National Insurance as separate line items. Expense inputs reduce the taxable amount before the estimate, useful for investors who mine or stake and have qualifying costs.

Why Choose The Accountancy Partnership?

• Expense Deduction Field: Reduces the taxable gain using qualifying expenses before calculating the estimate.
• Class 4 NI Calculated Separately: Breaks out Class 4 NI for mining and staking as a distinct figure.

CoinTracking

CoinTracking connects exchanges and wallets via API or CSV upload, categorises every transaction, and calculates gains, losses, and income across the full imported history. It supports 400+ exchange connections and applies HMRC share-pooling. A free plan covers portfolio tracking; paid plans start at $49/year and generate downloadable tax reports. An AI Tax Saver feature scans transaction data for legal tax-optimisation opportunities, including tax-loss harvesting positions.

Why Choose CoinTracking?

• 400+ Exchange Imports: API and CSV connections covering more sources than most tools here.
• Corporate Plan Available: Separate tier for fund managers and tax advisors managing multiple portfolios.

Kryptos

Kryptos connects exchanges and wallets, classifies each event type, trades, swaps, staking rewards, airdrops, NFTs, DeFi positions, applies HMRC share-pooling, and produces an SA108-formatted report with an audit trail linking each figure to its source transaction. The first 100 transactions are free; paid plans are needed beyond that volume.

Why Choose Kryptos?

• SA108 Output: Produces the UK-specific Self Assessment supplementary form number alongside the calculations.
• DeFi and NFT Classification: Labels LPs, lending, restaking, and NFT events with UK-specific tax treatment applied.

Conclusion

UK crypto tax requires Section 104 pooling, the 30-day bed-and-breakfasting rule, and the correct CGT band applied in the right order. Missing the bed-and-breakfasting rule can overstate losses and produce an incorrect Self Assessment submission. A calculator that applies HMRC’s actual methodology handles this automatically, and a tool that also syncs exchange data removes the manual entry step that causes most errors at filing.