Why is my crypto tax number too high?

When a disposal cannot be matched to an acquisition, the cost basis defaults to zero and 100% of the proceeds are reported as profit. Nothing fails and no error is raised — the number is simply wrong, in the taxman's favour. On one reference dataset of 7 wallets and roughly 30,000 records, a leading incumbent reported a £336,248 gain where the reconciled position was a £176,494.84 loss.

Does Finality file my tax return?

No. Finality computes the figures and produces a box-mapped working paper for SA108 plus an evidence workbook. You own the return and file it yourself. Finality is software: it is not a firm of accountants, not a regulated tax adviser, and not affiliated with or endorsed by any tax authority.

Does Finality support tokenised equities and real-world assets (RWAs)?

Yes. A tokenised equity, tokenised stock, tokenised treasury bill or gold-backed token is an ERC-20 transfer on the same chains, so the same engine reads it, prices it by contract, pools it under Section 104 and matches its disposals to the acquisitions that paid for them. There is no separate RWA mode and no allowlist of supported tokens. What the engine does not do is decide what an asset is for tax — a token representing a share may be a security rather than a cryptoasset, and that is put to you as an open question.

How are NFTs treated differently from fungible tokens?

HMRC applies no pooling and no matching rules to non-fungibles (CRYPTO22200) — each is specifically identified. Running a non-fungible through the pooling engine would pool what must never be pooled and apply rules HMRC excludes, so they are handled by a separate engine.

What does Finality cost?

A tax year is bought once, not subscribed to: £20 up to 1,000 transactions in the filing year, £40 for 1,001–10,000, and £60 beyond that (a US filing year is $25, $50 or $75). Every prior year of history the computation needs is included at no extra charge, because cost basis is cumulative. Scanning is free and shows every finding and its value; the corrected figure, the working paper and the evidence workbook are what is paid for.

Does Finality need my exchange API keys?

No. Finality does not accept exchange API keys at all. You upload the CSV export from your exchange instead, so there is no credential to store. Sign-in does not use your wallet either — there is no message to sign and no transaction to approve.

Working papers you can work with

A client with seven wallets across four chains does not arrive with records you can work from. Finality turns that position into what your file actually needs: a box-mapped computation, the evidence workbook SA108 requires to be enclosed, and — separated out, ranked by financial impact — the judgements that are genuinely the client’s to make.

Nothing is aggregated away, gains and losses are stated separately, every valuation and estimate is flagged for box 53, and the basis of preparation with its limitations sits on page one, not in a footnote.

Share mode

The client grants read-only access; they can revoke it at any time, and both of you can see exactly what is shared.

One sign-in, every client

Sign in with the address your clients share to, and every client who has shared a tax year with it is listed in one place, with whether they have paid and whether their documents are ready. Reviewing is free: each client pays for their own filing year.

Invite clients

Send a client an invitation from your client list. It shares nothing in either direction; they appear on your list only when they choose to share a year with you.

Open questions

Each with the amount at stake and both outcomes costed — a review agenda, not a data dump.

Evidence workbook

Every headline figure tied to source rows in a reconciliation sheet. XLSX, full detail, never sampled.

Sign-off state

Mark each question reviewed, record the position taken, and see what changed since you last looked. Sign off the year and your client approves it; a changed answer shows the sign-off no longer covers the figures.

Comments

A thread on each question and on the year, between you and your client, beside the figures it is about.

Open a sample working paper and workbook →

Example practice view · 2025–26illustrative — not a real client

Net chargeable

£(144,143.84)

Evidenced 4,190

Open questions

Open exposure 90,461.37

Estimated

Estimated effect ≤ 612.40

Open Q7 — POPCAT receipt, unclassified address23,566.00

Open Q3 — derivative classification, capital vs trading32,351.00

Working paper · evidence workbookSee a sample pack

The practice sees computations, evidence and open questions. It does not see sign-in details, billing, or anything the client has not shared. The figures above are the reference dataset this engine was built against, not any client’s.

An illustrative position

Component	£
Gains in the year	1,086,367.30
Losses in the year	−1,262,862.14
Cryptoasset position — SA108 boxes 13.4–13.5	−176,494.84
of which non-fungibles, specifically identified	−22,304.54
Derivatives, at the capital default (CG56100)	32,351.00
Net chargeable position	−144,143.84

The indented line is a memo — it sits inside the cryptoasset position rather than adding to it, and is excluded from the subtotal. A loss carries a minus sign on screen and accounting parentheses on the working paper; nothing is carried by colour.

What this is not

Finality is software. It computes figures and shows its working. It does not give tax advice, and it is not a firm of accountants. The judgement remains yours, which is the point — the tool’s job is to make sure you can see what you are signing.