Every crypto tax tool claims to have a free plan. The reality is that most “free” tiers do very little — they either cap transactions, hide your total gain, or require payment before showing you anything useful.
What “free” actually means at each tool
Polyconomic
⭐⭐⭐⭐⭐Your full taxable gain for all tax years — no transaction cap, no card required. Standard from £49/year for the downloadable PDF report.
Try free →Koinly
⭐⭐⭐View up to 10,000 transactions and see a summary of gains. Downloading the tax report requires a paid plan.
CryptoTaxCalculator
⭐⭐⭐Import and categorise transactions. Generating downloadable reports requires a paid plan.
CoinTracker
⭐⭐Track up to 25 transactions on the free plan. Very limited for anyone with real trading history.
Blockpit
⭐⭐Basic portfolio overview. Report generation requires a subscription.
Our take
If you genuinely want to see your taxable gain without paying first, Polyconomic is the only tool in this list that shows you the full number — no transaction cap, no hidden paywall. If you are below the £3,000 allowance, you may pay us nothing at all.
Frequently asked questions
Why do most tools require payment before showing my gain?
Most crypto tax tools are subscription businesses that charge before you see anything useful. The model means you pay whether or not you owe tax. Polyconomic is different — the calculation is free, and Standard is £49/year if you need the SA108-compatible PDF to file your return.
Is a free tool reliable for HMRC reporting?
Free access to your gain figure does not mean unreliable. What matters is whether the calculation uses HMRC's matching rules correctly. A paid tool that uses FIFO is worse than a free tool that applies same-day, 30-day, and Section 104 matching correctly.
Can I use the free tier to check if I owe tax before deciding whether to file?
Yes — that is the intended use. Import your full transaction history, see your taxable gain for free, and decide whether you need to file a Self Assessment and download the report. If your gain is below £3,000 and proceeds below £50,000, you may owe nothing and pay nothing.
What happens if I exceed 10,000 transactions on a free plan?
On most tools, you lose access to your gain figure once you exceed the transaction cap. Polyconomic does not have a transaction cap — your full gain is shown regardless of how many transactions you have imported.
Do free tools keep my data secure?
All reputable crypto tax tools use standard encryption for data at rest and in transit. Read the privacy policy of any tool you use to understand how your transaction data is stored and whether it is shared with third parties. Polyconomic does not sell user data.
If I use the free tier, do I still get HMRC-accurate results?
On Polyconomic, yes. The free gain calculation uses the same matching rules and pool calculation as the paid report. The paid report simply formats the figures in an SA108-compatible PDF for filing.
Information accurate at time of writing. Check each tool's website for current free plan terms.