Crypto trading through a limited company: trade or investment?

In short: Buying and selling crypto through a UK limited company does not automatically create a trade. HMRC examines frequency, organisation and intention, and expects a financial crypto trade only exceptionally. A genuine dealer reports trading profit. A non-dealer normally calculates chargeable gains, even if its accounts call the tokens stock. Taxley, a UK online Corporation Tax (CT600) filing service, supports screened cases on both routes.

Check whether Taxley fits your company, or see filing prices.

Key facts (checked on 26 October 2026)

When does buying and selling crypto amount to a trade?

The company's conduct must establish a trade; incorporation and a dealing account do not settle it. HMRC looks at frequency, organisation and intention, with financial trading expected only in exceptional cases. Its guidance expressly warns that calling token transactions trades is insufficient. See CRYPTO40150.

Build a factual record of why tokens were acquired, how dealing is organised, the time committed and the pattern of transactions. Equally, an investment label cannot override facts that establish a trade.

Taxley's dealer route asks whether crypto dealing is the company's only trade, whether it deals frequently as an organised business, and whether tokens are bought for short-term resale at a profit. These questions screen supported cases. They are not statutory transaction-count thresholds or an automatic HMRC ruling.

If the activity is mining or validating rather than dealing, use the staking and mining guide. Receiving rewards raises a different income question from selling tokens bought for resale.

How is a genuine crypto dealer's trading stock taxed?

A dealer's sales, cost of sales and valid stock movements form part of its trading result. Tax starts from correctly prepared accounts, subject to tax rules. There is no separate investment gain on the same dealer sale. CTA 2009 s.46 provides the accounts starting point; CRYPTO40150 distinguishes the trading route.

Trading stock includes assets sold in the ordinary course of the trade under CTA 2009 s.156. Cost of sales must reflect opening stock, purchases and closing stock, rather than simply the year's cash spent acquiring tokens.

HMRC accepts the lower of cost and net realisable value, or an appropriate mark-to-market basis, as explained in BIM33115. A properly supported NRV write-down can therefore affect a dealer's trading profit before the tokens are sold.

Mark-to-market is conditional. HMRC requires GAAP-compliant use, an appropriate liquid market, and value changes in profit and loss rather than a reserve. It also notes that FRS 102 strictly allows only the lower of cost and net realisable value, so mark-to-market relies on the true and fair override. BIM33160 does not give every crypto holder a free choice to deduct market falls. Taxley accepts the supported valuation answers; it does not establish that a chosen accounting policy complies with GAAP.

What does a crypto dealing trade example put on the CT600?

A genuine dealer with £100,000 sales, £70,000 cost of sales and £5,000 allowable running costs has £25,000 trading profit. With no other adjustments or reliefs, this reaches box 155. Its dealer sales are not reported again as capital disposals. The relevant return headings are in HMRC's CT600 guide.

Illustrative assumptions: 1 April 2025 to 31 March 2026; a UK resident company carrying on this commercial trade only; no associated companies, exempt distributions, losses, capital allowances or other income. The company is not a close investment-holding company. Accounts stock valuation is valid, and cost of sales already includes its closing stock adjustment.

The full-year small-profits limit is £50,000 under these assumptions, so no marginal relief calculation is needed. See GOV.UK Corporation Tax rates. Report a trading loss under the trading-loss rules, rather than converting it into a capital loss because the assets happen to be tokens.

What if a non-dealer's accounts show crypto as stock?

An accounts label alone does not turn investment disposals into trading income. Where the crypto is a capital holding, take the crypto sales, sold-token costs and write-downs out of the business tax result. Then calculate the capital disposal result separately. This follows the distinction between CRYPTO40150 and CRYPTO41200.

Taxley asks what crypto amounts the profit and loss lines contain. Include sales and also write-down reversals or other crypto gains shown as income. It separately asks for sold-token costs and write-downs included in cost of sales or other costs. This enables the computation to remove those amounts rather than tax both an accounts margin and a capital gain.

The capital calculation uses allowable tax costs, not whatever accounts stock value happens to remain. See CRYPTO41300. Each type of token has its own pool under CRYPTO41350. A company matches a disposal first with same-day purchases of that token, then with purchases in the previous nine days, before the pool. HMRC notes these company rules differ slightly from the rules for individuals.

An impairment of crypto simply held as an investment is not itself a realised capital loss. The Bitcoin investment guide explains that difference. Correct accounting presentation is a separate question from the tax adjustments described here.

How does Taxley correct a non-dealer stock example?

A company with a separate ordinary trade has £60,000 accounts turnover that includes £10,000 crypto sale proceeds. Its £30,000 cost of sales includes £8,500 of crypto costs and write-downs, and other allowable costs are £5,000. Removing the capital amounts leaves £23,500 trading profit before adding the separately calculated chargeable gain.

Illustrative assumptions: the same full-year, UK residence and 19% eligibility assumptions as above; crypto acquired as a capital investment, never appropriated into or out of trading stock. All crypto is shown alike. There are no rights tokens, reward income or netted entries. The £2,000 capital gain is correctly calculated after applicable pooling, with no capital losses.

This example does not assume the £8,500 is the capital tax cost: it includes accounts write-downs. The £2,000 gain needs its own acquisition and disposal working. Company chargeable gains explains the gain and loss boxes.

How do other CT600 and crypto tax tools handle company crypto?

From each provider's public help pages, checked October 2026: Taxpipe, a CT600 filer, explains that a crypto trade's profit goes in box 155 and non-trading staking or mining income in box 205, but the user works out and enters the figures, including any gain. TinyTax, a micro-entity filer, has users remove unrealised fair-value gains with a negative tax adjustment.

FreeAgent, which files CT600s for micro-entity companies, lists chargeable gains and buying and selling investments among the scenarios its Corporation Tax return doesn't support. Recap and Koinly are crypto tax tools, not CT600 filers: Recap's company plan applies HMRC's company matching rules and produces chargeable gains reports, while Koinly's help centre documents no company-specific tax report. A help page can omit what a product handles through manual adjustments.

Taxley doesn't import exchange or wallet history: each capital crypto disposal is entered under Chargeable gains with its proceeds and cost. What it adds is the classification questions above and moving the supported crypto amounts in the accounts to the CT600 boxes this guide describes.

Which dealing and stock cases remain outside Taxley?

Taxley supports a screened sole crypto dealing trade and capital crypto shown as stock by a non-dealer. Each route needs consistent accounts placement and complete sale information. A mixed company can combine one supported trade with property income, but the crypto adjustments cannot straddle both businesses' figures on the supported stock route.

Taxley cannot yet file crypto dealing in a company filed as an investment company (its return has no trade), dealing whose accounts don't show the crypto as stock, a crypto dealing trade alongside another trade, stock valued by an unsupported method, or crypto moved between trading stock and investment or own use. Transfers can engage TCGA 1992 s.161 and the stock rules in CTA 2009 s.157. They are not ordinary cash sales to enter without that analysis.

The non-dealer stock route also excludes holdings shown in different ways, stablecoins, NFTs and rights tokens, crypto income, netted amounts, and amounts split across both business blocks. Already tax-adjusted mixed-company trading figures or manually overridden property profits can also prevent the required adjustment.

For dealers, crypto sales must be in the trading figures, not the profit-or-loss-on-disposal line or Chargeable gains. Fix those placements before filing. Taxley also refuses reward income on a dealing trade's stock; the income guide defines its supported alternatives.

For other holdings, read Part 8 crypto assets and long periods with crypto. Check your company's fit, then view pricing.

Frequently asked questions

Does opening a limited company make my crypto activity a trade?

No. The company structure does not decide whether the activity is a financial trade. HMRC examines the facts, including organisation and intention. Taxley's trading questions screen a supported case; they do not replace that factual assessment.

How many crypto transactions make a company a trader?

HMRC does not set a transaction count in CRYPTO40150. Frequency is one factor alongside organisation and intention. Many exchange transactions, or calling every purchase a trade, do not by themselves establish a financial trade for Corporation Tax.

Can a crypto trader deduct a fall in unsold stock?

A valid stock valuation can affect trading profit before sale. The lower-of-cost-and-NRV and qualifying mark-to-market rules have conditions. This differs from an unrealised write-down of a capital investment, which does not itself establish a capital disposal loss.

Does a crypto dealing sale go in both boxes 155 and 210?

No. HMRC says a crypto trade's profits form part of trading profits instead of being a chargeable gain. For a dealer, Taxley asks you to remove crypto sales from Chargeable gains and from the profit-or-loss-on-disposal line. Other capital assets, such as shares, still go under Chargeable gains.

Can I turn a capital crypto loss into a trading loss?

Not by relabelling. Moving an investment into trading stock is a deemed sale at market value under TCGA 1992 s.161. Since 8 March 2017 the election to roll the result into trading profit applies only where a gain would arise, so a built-in loss stays a capital loss. Taxley doesn't support these transfers.

Can Taxley file crypto dealing alongside rental property?

Yes, for the supported mixed-company case where dealing is the only trade and the remaining screening answers qualify. Another separate trade is different. Property and trading figures must remain identifiable so the computation applies each crypto amount once.

Review your figures before you file, ideally with a qualified adviser.