Crypto Tax · Central London
Crypto tax returns in Mayfair
HMRC receives data from UK exchanges and from 2026 under the Cryptoasset Reporting Framework from overseas ones too, and is writing to people in Mayfair whose returns do not match. We produce the report that puts you in the right position: every disposal, every pooled cost, every bit of staking income, with the gains and losses reconciled. Fixed fee, online.
from £199 · fixed, per report
Next deadlines
- Online Self Assessment filing deadline and balancing payment due
- Tax year ends: last day for pension, ISA and dividend timing decisions
- Second payment on account due
- Register for Self Assessment if you started self-employment or new untaxed income in the last tax year
Who this is for
Crypto Tax for Mayfair
Individuals in Mayfair who hold or have held cryptoassets: long-term investors with a few disposals, active traders with thousands of swaps across several exchanges, people earning staking or lending yield, NFT buyers and sellers, those who received airdrops or forks, anyone who has had an HMRC nudge letter, and people with losses from collapsed exchanges or rug-pulled tokens to claim.
What is included
Everything inside the fixed fee
- Transaction history imported from exchanges and wallets, with transfers between your own wallets matched and excluded
- Capital gains computed under HMRC's section 104 pooling, same-day and 30-day rules for every token
- Staking, mining, airdrop, lending and DeFi income identified and reported as miscellaneous or trading income
- Losses calculated and claimed, including negligible value claims for worthless or lost tokens
- A report you can keep: disposals, proceeds, allowable costs, gains, losses and the pool position for each asset
- Self Assessment capital gains pages and income pages completed and filed in the £279 package
How it works
Crypto Tax from Mayfair, step by step
Scope the job
We find out what you need filed, when it is due and what state the records are in, and tell you which fixed-fee package applies.
Agree the price
The fee is confirmed in writing. There is no hourly billing and nothing added for questions during the work.
Hand over the records
Photographs, PDFs, software access or a spreadsheet, sent however suits you. We confirm what we have and what is missing within two working days.
Approve, then we submit
You review the draft with our explanation, sign off, and we file. Receipts, copies and the next deadlines come back to you immediately.
Why IGI
The IGI way of working, in Mayfair
No hourly rate and no surprise invoice. Mayfair clients know the fee for crypto tax before they send a single document, and it stays fixed.
Deadline-first: the dates that matter for crypto tax are shown at the top of this page, diarised for every Mayfair client and chased before they arrive.
Online only, UK based. There is no office in Mayfair to pay for, which is why the fee is the same here as anywhere in England; the work is done by people in the UK who answer the same day.
You get one contact for crypto tax, not a queue. Mayfair clients message the same person throughout and get an answer in working hours, usually within a few hours.
We explain crypto tax in the words Mayfair business owners use, not in accountant's shorthand, and we show our working so you can check it.
You stay in control of crypto tax: drafts go to Mayfair clients first, with the figures explained, and nothing leaves us until you say so.
Local facts
About Mayfair
Mayfair is in Central London, within Westminster, in the W1K postcode district, England. For businesses in England the tax rules are those set by the UK Parliament: the 20/40/45% income tax bands, Class 4 National Insurance for the self-employed at 6% and 2%, Corporation Tax at 19% to 25%, and Stamp Duty Land Tax on property. Business rates are set locally by the council.
| Place | Distance | Direction |
|---|---|---|
| West End of London | 0.4 mi | NW |
| Oxford Circus | 0.4 mi | NE |
| St James's | 0.5 mi | SE |
| Piccadilly, Westminster | 0.5 mi | E |
| Marble Arch | 0.5 mi | W |
| Soho, Westminster | 0.6 mi | E |
| Marylebone High Street | 0.6 mi | N |
| Marylebone, Westminster | 0.6 mi | N |
Worth knowing
Rules that come up in this work
CIS deductions
CIS turns construction subcontractors into advance taxpayers: a fifth of every labour payment goes to HMRC before they see it. Registering keeps the rate at 20% rather than 30%; gross payment status, for established businesses with a clean record, removes deductions altogether. The annual return is where the overpayment comes back, and filing it early brings the refund sooner.
Confirmation statements and identity verification
Companies House has tightened its requirements under the Economic Crime and Corporate Transparency Act: every company needs a registered email address and an appropriate registered office, every statement includes a lawful-purpose declaration, and every director and PSC must verify their identity. The confirmation statement, due annually with a £50 fee, is where most of this is confirmed.
Payments on account
If your Self Assessment bill exceeds £1,000 and less than 80% of your tax was collected at source, HMRC asks for two advance payments towards the following year, each half of the current bill, due 31 January and 31 July. The first year this happens the January payment is effectively one and a half times the bill. We model it in advance and show you how to reduce the payments if income is falling.
The Self Assessment calendar
Four dates govern Self Assessment: 5 October to register, 31 October for paper returns, 31 January to file online and pay, and 31 July for the second payment on account. Missing the January date triggers an automatic £100 penalty before any tax is even considered, so we treat it as the fixed point around which the rest of the year is planned.
Making Tax Digital for Income Tax
The biggest change to Self Assessment in a generation is Making Tax Digital for Income Tax, now live for higher-earning sole traders and landlords and arriving for the rest in stages. Quarterly updates are due by 7 August, 7 November, 7 February and 7 May, built from digital records. The practical consequence is that spreadsheet-and-shoebox bookkeeping is ending for anyone above the threshold.
Late filing penalties
Penalties are the clearest reason to work to deadlines. A Self Assessment return one day late costs £100 regardless of whether any tax is due; three months late adds £10 a day. Late company accounts start at £150 and reach £1,500, and double if the previous year was also late. None of this is negotiable afterwards except through a narrow reasonable-excuse appeal.
Corporation Tax rates and marginal relief
Companies pay Corporation Tax at 19% on profits up to £50,000 and 25% on profits over £250,000. Between those figures marginal relief applies, producing an effective rate that rises gradually and a marginal rate of 26.5% on each pound in the band. The thresholds are divided by the number of associated companies, so a director with two companies has thresholds of £25,000 and £125,000 for each.
Questions
Crypto Tax questions from Mayfair
What if I am a trader rather than an investor?
HMRC rarely accepts that an individual is trading in crypto; the bar is very high and the badges of trade must be met. If you are trading, profits are income and losses are trading losses. For almost everyone the capital gains treatment applies, and we tell you plainly which side of the line you are on.
How far back do I need to go?
The pool cost of what you hold today depends on every purchase you have ever made, so the computation must start from your first transaction even if you only need to report recent years. If earlier years were under-reported, we quantify the position and advise on disclosure, which HMRC treats far more leniently than discovery.
Are NFTs treated the same as coins?
Each NFT is a separate asset, so pooling does not apply; the gain is proceeds less the cost of that specific token including gas fees. Creating and selling NFTs regularly may be trading income rather than capital gains. Royalties received are income. We classify each case from the facts.
Do I need to register for Self Assessment just for crypto?
If your total disposals exceed £50,000 in the year, or your gains exceed the £3,000 allowance, or you have taxable crypto income, yes. Register by 5 October after the tax year. Since 2024/25 the return has a dedicated section for cryptoassets. We handle registration where you are not already filing.
I received an HMRC letter about crypto. What should I do?
Do not ignore it and do not reply without the figures. HMRC's nudge letters are sent where exchange data suggests undeclared activity. We prepare the full report, work out what should have been declared, and draft the response, including a voluntary disclosure where tax is owed, which reduces penalties substantially compared with being caught.
How is the fee set?
By transaction count. Up to 500 transactions across all exchanges and wallets is £199 for the report alone or £279 with your Self Assessment filed. Over 500 is £399. A response to an HMRC nudge letter, including the report and the reply, is £249. We confirm the band from your exports before starting.
How do I get started from Mayfair?
Message us on WhatsApp or email with a sentence about your business and what you need. We reply in working hours with any questions and a fixed fee for crypto tax. Once you confirm, we tell you exactly which records to send and the work begins. Most Mayfair clients are set up within a day.
Which deadlines matter most for crypto tax?
The next four dates that apply to crypto tax are shown at the top of this page, calculated from today. For Mayfair clients we diarise every one of them from the day you join and send reminders before each, so the work is done in good time rather than in the last week before a penalty.
Get a fixed quote for Mayfair today
Tell us what you need. You get one fixed fee in writing, and nothing is filed until you approve it.