Transferring shares in a private company takes one short document — the stock transfer form — and a decision about stamp duty that turns on a single threshold. Consideration of £1,000 or less, and no duty is payable and nothing goes to HMRC. Above it, 0.5% is due, and the form must reach HMRC within 30 days of being signed and dated.
What the form does, and what it does not
A stock transfer form records the transfer of existing shares from one person to another. It is not how new shares are created — that is an allotment, recorded on form SH01 — and it is not, by itself, what makes the transferee a shareholder. The legal sequence is: the form is signed by the transferor; stamp duty is paid if due; the form and the old share certificate go to the company; the directors approve the transfer, subject to any restrictions in the articles; the company updates its register of members and issues a new certificate.
That register entry is the moment ownership changes. A signed form sitting in a drawer with the register never updated is the single most common defect found in company due diligence — and the point at which the "shareholder" discovers they are not one.
The form itself is not filed at Companies House. Share transfers are reported on the annual confirmation statement, which is why the register, not the public record, is the authoritative source between statements.
The stamp duty decision
Where consideration exceeds £1,000, stamp duty is 0.5% of the consideration, rounded up to the nearest £5. The form is sent to HMRC with payment within 30 days of the date it was signed and dated — late submission attracts penalties and interest, calculated from that date rather than from when anyone noticed.
Where the consideration is £1,000 or less, the transferor completes certificate 1 on the reverse of the form, confirming that the consideration does not exceed £1,000 and that the transfer does not form part of a larger transaction or series of transactions exceeding that figure. That last condition is the one people overlook: four transfers of £900 each, forming part of one arrangement, are aggregated and the certificate is false.
Certificate 2 covers transfers that are exempt for a different reason — transfers to beneficiaries under a will, transfers on divorce or dissolution, and other cases where what passes is not chargeable consideration. Note the case that needs neither certificate: where there is genuinely no consideration at all, a gift pure and simple, you complete neither certificate 1 nor certificate 2 and enter the consideration as "Nil". Nor does certification do the work where a relief is being claimed — group relief among them. There the form goes to HMRC with details of the relief for them to consider it, rather than being self-certified and kept in the file.
Note what counts as consideration. It is not only cash: assuming a debt, issuing shares in exchange, or any other value passing all count, and a transfer described as a gift where the transferee takes on a liability is not a gift for stamp duty purposes.
Restrictions in the articles
Most private company articles restrict transfers, and the restrictions bind. The common ones are pre-emption rights — existing shareholders must be offered the shares first, at a price determined by the mechanism in the articles — and a directors' discretion to refuse to register a transfer, sometimes absolute, sometimes limited to defined circumstances.
A shareholders' agreement may add more: tag-along rights protecting minorities when a majority sells, drag-along rights compelling minorities to join a sale, and compulsory transfer provisions on a shareholder leaving employment or dying. A transfer completed without working through these is vulnerable, and unwinding it later is considerably harder than pausing for a week beforehand.
Where transfers go wrong
- The register is never updated, so legal title never passes despite everyone behaving as though it has;
- The 30-day clock is missed, because the form was signed months before anyone thought about stamping it;
- Certificate 1 is used where the transaction is part of a larger series, which understates duty and is discovered on diligence;
- Market value is assumed to be irrelevant. Usually stamp duty follows the actual consideration, but not always: securities transferred to a connected company are charged on consideration or market value, whichever is higher, and on market value where there is no consideration at all. And market value governs elsewhere regardless — a transfer at undervalue between connected parties is a disposal at market value for capital gains, and a transfer to an employee can be employment income;
- The old certificate is lost, requiring an indemnity before the company will register the transfer.
The tax point in the middle of that list is the one that costs the most. Transferring shares to a family member for £1 does not avoid capital gains tax — the gain is computed on market value — and where the recipient is an employee or director, the discount can be taxable as earnings instead. Getting a valuation before a transfer between connected parties is cheaper than arguing about it later.
Acumon handles share transfers, registers and the tax that attaches to them through company secretarial services, with valuations where a transfer is between connected parties and capital gains tax advice where a disposal is involved. If your register of members has not been updated since the company was formed, that is the thing to fix before anyone wants to buy it.