Crypto tax is the return most accountants would rather not file. It is the only one we do.

Certified Crypto Accountant is a UK firm, licensed and regulated by the AAT, built for one job. We rebuild your exchange, wallet and DeFi history from source, apply HMRC’s share pooling rules by hand, and file the Self Assessment ourselves, on a fixed fee agreed before any work starts.

Most reports we are sent overstate the gain. Finding that before you file is the whole job, and it is why the firm exists.

Why we exist

Crypto broke the old model of accounting. Dozens of data sources, on-chain histories, DeFi, NFTs, staking, wrapping, bridging, and HMRC rules that generic software applies wrongly. Most accountants see a handful of crypto cases a year and take the software output at face value. Those numbers are routinely wrong, and investors end up overpaying tax on gains they never made, or underpaying and walking into penalties later.

We built the firm to close that gap. No crypto investor should pay a pound more than the law requires, and none should lie awake over a letter. We reconcile the raw data, apply the rules precisely, and turn a chaotic wallet history into a return you can defend and a number you can trust.

We do it under UK rules only, for individuals, traders, DeFi users and founders, at a fixed price agreed before we start.

The figure you file should be the figure you owe. Everything we do exists to make those two numbers the same.The standard behind every engagement

Which one is you?

Nearly everyone who calls us is in one of four situations. Each has its own fix, and its own fixed price agreed before any work starts.

Transaction reconciliation

Your report shows a figure you do not believe

A transfer between your own wallets counted as a sale, a cost basis that never made it into the pool, a year of DeFi read as income. We rebuild the history from every exchange, wallet and protocol you used and hand back a record HMRC can follow line by line.

How reconciliation works

UK tax filing

You need to file, and you need it to be right

Self Assessment with the cryptoasset boxes filled in properly and the section 104 pool built from source rather than from a software export. You see every number before we submit a thing.

What filing with us looks like

Investigation and disclosure

HMRC has written to you

A nudge letter, a compliance check or a full enquiry. We take over the correspondence, rebuild your position from the records, and run a voluntary disclosure where it cuts the penalty rather than adds to it.

What to do with the letter

Ongoing crypto accounting

You trade all year and want it handled all year

Active traders, DeFi users and founders paid in tokens get a retained accountant, quarterly reviews and planning before big disposals, so January is just another month.

The retained service


How we work

The same four habits run through every engagement, whether it is one corrected report or five years of catch-up filing.

We tell you what we find

If earlier years were filed wrong, you hear it from us first, with the risk explained and a route to put it right. Bad news arrives plainly and early.

One price, agreed first

You get a fixed quote built on the real complexity of your records, and it is agreed before any work starts. The invoice matches the quote.

Every figure explained

Each calculation comes with the reason behind it, in plain English. You understand your own return, and it is filed only once you have signed it off.

The same person, every year

You deal with the person doing the work, from the first call to the filed return and into the next tax year. There is no ticket queue between you and your accountant.


The people behind it

A small team. You work directly with the people doing the work.

Fahad Zar, lead chain analyst and crypto tax expert at Certified Crypto AccountantAAT licensed
Filing and HMRC letters

Fahad Zar

Lead chain analyst and crypto tax expert

MSc Accounting & Finance, BPP University London
AAT Licensed Accountant and MAAT, licence 1010475
Six years working in crypto and digital assets
Based in London, UK

Sehar Javed, Chain Analyst at Certified Crypto Accountant
On-chain tracing

Sehar Javed

Chain Analyst

MBA in Finance
ACCA finalist
Wallet and exchange reconciliation, on chain and off
Three years working in crypto tax at several crypto tax firms


Most reports we are sent overstate the gain.
Find out if yours does.

Thirty minutes with the person who would do the work. You leave with a straight answer on where you stand and a fixed price before anything starts, and you keep the answer either way.

Fixed fee agreed before work startsVerdict on a report within 48 hoursUK only, AAT licensed, crypto tax only