About us
We looked at the alternative and decided it was not good enough.
Crypto tax in the UK is genuinely complicated. The tools available to help with it were not.
Most people who hold crypto in the UK are not professional traders. They bought some Bitcoin when it was in the news, maybe tried a few altcoins, possibly staked some Ethereum. They have a mix of exchanges and wallets and a rough sense that they probably should have done something about their tax by now.
What stops them is not laziness. It is that every existing solution feels designed for someone else. The tools are complex. The pricing is high. You pay £150 before you find out whether you even owe anything. And when you do find out, the output is dense tax jargon that requires a second round of Googling to understand.
HMRC's rules for crypto gains are specific and non-negotiable — same-day matching, the 30-day rule, share pooling in the correct order. Getting these wrong means either overpaying or underpaying, neither of which is a good outcome. But applying them correctly is not magic. It is just careful software.
So we built Polyconomic with a different set of priorities: the calculation is free, the copy is plain English, the price is fair, and we are honest about what we can and cannot do.
We are a small team. We do not have investor pressure to inflate the product roadmap or the price. We are focused on doing one thing well: making UK crypto tax genuinely accessible to the people who need it most.
How we work
The principles behind the decisions we make.
Free to look
You can see your taxable gain without entering a card number. If you are below the annual allowance, you may owe nothing and need nothing from us. We think you should know that before we ask for money.
Correct, not approximate
HMRC's matching rules are not optional. Same-day rule, 30-day rule, Section 104 pool — applied in sequence, every time. There is no shortcut that produces the right answer.
Plain English always
We write every summary, every report section, every error message for a normal person. If you need a glossary to read your own tax report, the report has failed.
Fair pricing, no games
Free to see your gain. £49 a year for Standard — full reports, all years. £99 a year for Pro — unlimited transactions, accountant sharing, CSV export. No surprises.
Honest about our limits
We are a calculation tool. We are not a tax adviser. Complex situations — DeFi edge cases, professional trading, multi-jurisdiction holdings — need professional advice. We will tell you when you have crossed that line.
UK-only and better for it
We do not try to cover 50 countries with one tool. HMRC's rules are specific. Our focus is specific. That focus means we get the UK right, rather than handling it as one of many equally shallow implementations.
Our belief
Understanding your crypto tax position should not cost hundreds of pounds a year.
That belief drives every decision we make. If something makes the product harder to use, more expensive, or less honest, we do not build it.
We are HMRC-compliant and keep the rules up to date as HMRC guidance evolves. We take data security seriously — your transaction data is encrypted at rest and never used for any purpose other than running your calculation. We are registered with the ICO.
And we are clear about what we are not: we are not regulated tax advisers, we are not a substitute for professional advice when your situation demands it, and we do not make claims we cannot back up.
See your gain for free
No card needed. No subscription. Just your number.