Your accountant may have your exchange CSVs open, but Bitcoin can move through hardware wallets, bridges or DeFi. Records may then be missing. Unrecorded transfers can distort acquisition costs, create apparent disposals or leave HMRC questions unanswered.
Hiring accountants in the UK means finding someone who checks wallets, exchanges and DeFi under HMRC rules. Compare written scope, not headline fees. Ask how they handle missing records. Online Self Assessment returns are generally due by 31 January after the tax year ends.
Bitcoin tax UK starts with complete records
Tax follows recorded disposals and income.
For recent tax years, the annual Capital Gains Tax allowance has been £3,000. That allowance does not remove the need to calculate each disposal correctly. It may not apply in the same way to staking, mining or employment income.
Match each withdrawal to an address you control.
Activities that need specialist review
DeFi needs a specialist tax review. DeFi means financial activity carried out through blockchain apps rather than a bank.
A bridge moves tokens between blockchain networks. It can look like a sale in raw data. The accountant must check what actually happened.
Credentials do not prove capability
Ask for written confirmation of how exceptions and cost basis are checked. Cost basis is the amount you originally paid for crypto.
Before appointing a UK crypto tax accountant or cryptocurrency tax adviser, check more than website wording. Ask if they belong to a recognised UK professional body. Ask who will review the work.
Ask if they have handled HMRC crypto calculations like yours. A good adviser explains transfers, disposals and cost basis in plain English. They should explain how they keep disposal records.
The most common error is trusting an exchange export as the full history. It rarely includes every wallet move or DeFi action.
They should explain their approach to DeFi and staking rewards. They should not promise a tax result before checking your transaction history.
Request a redacted reconciliation report or tax schedule. Check independent reviews for clear communication and reliable deadlines.
Test accountants before comparing their fees
Compare reconciliation scope before comparing headline fees.
Ask five technical questions
Ask about methods, reviewers and quoted limits.
- How will you find transfers between wallets and exchanges that I control?
- Who checks unmatched deposits, withdrawals, token swaps and missing cost basis?
- How do you treat staking rewards, lending, liquidity pools, airdrops and NFT disposals?
- Will you apply Section 104 pooling, same-day rules and the 30-day rule?
- What support is included if HMRC queries my Self Assessment return?
Reject vague claims about software. Ask for a reconciliation report.
Compare written scope, not claims
| Comparison point | Local general firm | Remote crypto specialist | Verified directory firm |
|---|
| Named exception reviewer | Confirm in writing | Usually stated | Varies by firm |
| Wallet reconciliation | Often extra | Often scoped in | Must confirm |
| Simple annual fee | £300 to £750 | £400 to £1,000 | Depends on member |
| HMRC enquiry support | Often separate | Often separate | Depends on member |
Price ranges are guides. The exact scope matters more than where the firm is based.
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Useful for this topic
A plain-English UK Bitcoin tax book can help you understand quote questions before signing. It should support professional advice, not replace a review of your records.
- Explains common taxable crypto disposals before you discuss them with an accountant
- Shows why wallet transfers need evidence, rather than assumptions
- Gives you a reference when preparing exchange exports and old records
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Score each proposal before signing
Shortlist firms with written wallet, DeFi and HMRC support.
The best quote is not the cheapest quote. It states who checks exceptions, which records are included, and what happens if HMRC asks questions.
Use one comparison sheet for every proposal. A low starting fee can hide a much narrower service.
Score each firm from 1 to 5 for relevant experience. Also score wallet checks, CSV records, DeFi coverage and software compatibility. Include turnaround time, fixed-fee limits and HMRC enquiry support.
Record whether the quote covers earlier years and unmatched transactions. Check if it includes sterling values, tax calculations and Self Assessment filing.
A cheap quote can create expensive work later.
For example, a firm may support your exchange but not your self-custody wallet. It may also fail to check a bridge transaction. That can create more work later, despite a lower quote.
Ask each firm to confirm exclusions in writing. Ask for the hourly rate for extra investigation.
Quote costs by complexity and missing history
Costs rise with activity, platforms and missing history.
Prepare records before requesting quotes
Give each firm the same records. This makes every quote easier to compare.
- CSV exports and API reports from every exchange used in each tax year
- Public wallet addresses, transaction hashes and a list of wallets you control
- Bank records for fiat deposits and withdrawals that prove acquisition cost
- Past Self Assessment returns, capital gains calculations and HMRC letters
- A list of staking, mining, airdrops, lending, NFTs and DeFi protocols
Handle missing years early
Agree assumptions, fees and timing before rebuilding old records.
A specialist may not be needed if you had no taxable disposals. This can apply where activity was small and records are complete. Check your own facts first. An accountant cannot replace legal advice in suspected fraud, a formal HMRC investigation or a tax dispute. The same applies to UK residence issues involving another country.
Fees should reflect transaction difficulty, not only the number of tax years. An occasional investor may use one or two exchanges. They may have complete records and few disposals.
Such a case may fit a basic annual quote. Active trading across several platforms needs more checking and review.
Staking, mining and NFTs can add income calculations and valuation work. DeFi lending, liquidity pools, bridges and token migrations often need separate review. Their tax treatment depends on the facts.
This pricing approach works well in theory, but missing history changes the cost quickly.
Company accounts and payroll token awards also increase the scope. Several unfiled years increase it further. Ask for a base fee and a clear transaction or wallet allowance.
Ask for a stated price to rebuild missing history. Also ask about amendments and HMRC enquiry support.
FAQs
How much does a crypto tax accountant cost in the UK?
Clean, limited activity often costs £300 to £750. Multiple platforms, active trading or missing records raise fees. Complex DeFi work may exceed £1,500.
Do accountants deal with crypto taxes?
Yes, but check their crypto skills before you hire them. Confirm wallet checks, Section 104 pooling, staking treatment and crypto-to-crypto trades. Software imports alone are not enough.
Can HMRC check my crypto transactions?
Yes, HMRC can ask for evidence behind Self Assessment figures. Keep exports, addresses and cost-basis records for each tax year. Cost basis means what you paid for the asset.
Should I hire a local crypto accountant near me?
Location matters less than written scope and safe record handling. A remote firm can work well if it checks wallets and explains its process. Choose a local firm only if that helps you communicate.
What should I send a crypto accountant before hiring one?
Send CSVs, wallet addresses, past returns and the tax years involved. Include all DeFi, staking, NFT and mining activity. Include gaps in your records too.
Can a crypto accountant correct old tax returns?
Yes, an accountant can rebuild records and assess amendments or voluntary disclosure. The right route depends on timing, amounts and any HMRC contact. Tell the firm about HMRC contact at once.
Is crypto-to-crypto trading taxable in the UK?
Usually, yes: a crypto swap is a disposal for UK tax. You need a sterling value and the relevant UK cost-basis rules. This can apply even when no pounds reached your bank.
The essential points:- Choose an accountant who checks wallets and exceptions, not only exchange CSV files.
- Compare written scope for tax years, wallets, DeFi activity and HMRC support.
- Prepare records before seeking quotes so the fee and timing are realistic.
- Deal with missing years early, before HMRC makes contact.
Related sources
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