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UK crypto tax for Self Assessment

Your crypto records, sorted out. Maneta only asks what it cannot know.

Add your exchanges and wallets. Maneta reads your history, counts each trade once, links transfers between your own accounts and works out your gains to HMRC’s rules. Where only you know the answer, it asks one plain question.

New accounts are opening in stages. Leave your email and we will tell you when a place opens. Invitations from an accountant work now.Maneta only reads your history. It can never move funds.

Your records are sorted

  • 692transactions read from 4 sources
  • 41were in two places and are counted once
  • 58transfers between your own accounts linked
  • 96values taken from market prices
  • 12scam and spam items filtered
  • 7fees recovered

3 questions for you

An illustration with sample data: what a sync ends with.

What it does

Most of it is handled. The rest is a short list of questions.

Everything Maneta finds in your records ends one of three ways.

Handled

Maneta sorted it

You see a line in the receipt and in the log, with the reason. Undo is always there, and it survives the next sync.

  • The same trade in two places is counted once
  • Transfers between your own accounts are linked
  • Missing values come from the source or from market prices
  • Scam tokens, dust and address-poisoning attempts in your history are filtered out and listed, so they are never counted as yours.
Please confirm

Maneta has an answer; you check it

When Maneta cannot quite prove something, or a change would move your gain by a lot, you get one card to check before anything changes.

  • Two records that look the same but cannot be proven the same
  • A change that would move a year’s gain by more than £250
  • A new transaction like one you answered before: “Same as before?”
We need to ask

Only you know

One plain question, with “I don’t know”, and a line saying what answering changes. Questions about the same thing are asked once, not twenty times.

  • Whose wallet an address is
  • Whether a transfer was a gift, a payment or a sale
  • How a DeFi move or a fork should be treated
  • What you paid for coins bought before your connected history

What Maneta never does

  • Never invents what you paidIf a purchase is not in your records, Maneta does not guess a cost. The figures that rest on it read Unknown until you add the purchase.
  • Never deletes a recordBoth copies of a duplicate are kept. One is counted.
  • Never overrides your decisionWhat you decide stays decided, sync after sync. “These are different” is remembered for good.
  • Never changes anything when you open a pageThe work happens when a source syncs or a file is imported, and ends with a receipt.
  • Never signs or files for you“I confirm these figures” is always your own click. A report is frozen by you, or by your accountant’s firm when a Partner signs off a version. You file with HMRC yourself.
  • Never moves fundsExchange keys are read-only. Wallets are added by their public address.
How it works

Three steps.

  1. Step 1Add your sourcesA read-only key for Kraken or Coinbase, a wallet’s public address, or a file exported from another exchange.
  2. Step 2Maneta sorts your recordsIt reads everything, sorts out what it can and gives you a receipt: what was read, what was counted once, how values were found, and any questions for you.
  3. Step 3Answer, check, downloadAnswer the questions, read the report and what it rests on, then freeze it and download the figures for your Self Assessment.

Where your records can come from

Read-only key
Kraken
Coinbase
Wallet address
Bitcoin
Ethereum
XRP Ledger
Solana
Hedera
BNB Smart Chain
Polygon
Arbitrum
Optimism
File
Exchange export (CSV)
  • HMRC’s rules, with the workingSection 104 pooling, the same-day rule and the 30-day rule. “Explain this” shows the working behind any figure, on every plan.
  • A report that says what it rests onYour answers, the duplicates counted once and the market prices used sit beside the figures.
  • The files for your returnA Self Assessment summary, SA108 box values and a list of disposals. Downloads start with Go.
  • A log you can undoEverything Maneta handled and everything you decided, in one place, each with its reason.
  • Check what an exchange reportsOn Plus, compare an exchange’s own report of your trades with your records before you file.
  • Work with your accountantInvite an accountant to see your figures, view only, on Plus. Or join your accountant’s firm: their plan covers yours.
The report

Figures, and what they rest on.

The tax report shows the year’s gains and losses, then says in plain words what the figures depend on and what could still change them. A Draft can change. A report you freeze cannot.

Sample figures for illustration, not a real account. You can try Maneta on your own records on Preview for free; every transaction of a tax year, and the files, start with Go.

Capital gains · 2025/26

DraftSample figures
Disposal proceeds
£52,340.10
Gains
+£4,812.40
Losses
−£1,249.75
Net gain
£3,562.65
Annual exempt amount
−£3,000.00
Taxable gain
£562.65
What this rests on41 duplicates counted once · 96 values from market prices · 58 of your own transfers linked · 41 disposalsHow far it could still move3 questions are open. These figures could still move by up to £1,232.40: down by up to £1,020.00 if the SOL had a cost, up by £212.40 if the XRP sent was a sale. The three addresses change nothing if they are yours.

Free to start. Pay when you want the files.

Preview is free: your portfolio, 1 source, and the first 50 transactions of each tax year on screen. No card needed. Paid plans show every transaction and add the files for your return and more room. Every plan sorts your records the same way.

Compare all plans
  • Preview1 source · the first 50 transactions of each tax year shownFree
  • Go500 transactions per tax year · 2 sources£39 / year
  • Plus5,000 transactions per tax year · 5 sources£99 / year
  • Pro25,000 transactions per tax year · 20 sources£249 / year

Accountants and practices

One subscription for the firm covers every client. You see what Maneta already sorted for each client, and ask only what that cannot answer.

Maneta for firms