What is a share buyback and how does it work?

Reducing a company’s share capital through a share buyback is a common tool used by private companies. But while the concept seems simple (a company buying back its own shares), the legal, tax and procedural requirements can be surprisingly complex.

Whether you’re a founder looking to restructure the shareholder base, take back shares held by a leaver or return surplus cash to investors, it’s important to understand the mechanics of a buyback – and the potential traps. Done properly, it can be a clean and commercially effective route to reshape your company’s share capital. Done badly, it can lead to the buyback being void and problems down the line at the point of a future funding round or exit.

In this guide, we explain what a share buyback is, when it’s used, the main legal steps involved and where things can go wrong.

What is a share buyback?

A share buyback (also known as a purchase of own shares) is when a company buys back some of its issued shares from one or more shareholders. Those shares are usually cancelled immediately, reducing the company’s issued share capital.

The remaining shareholders typically benefit from a larger percentage of ownership in the company without investing further. The shareholder selling their shares receives cash or other agreed consideration and ceases to hold those shares.

Under English law, a private limited company may only buy back its own shares in very specific circumstances and must follow a strict legal process to ensure the transaction is valid and enforceable.

Why would a private company reduce its share capital?

There are a range of commercial reasons why a company might want to reduce its share capital:

• Facilitating a leaver’s exit
  • In many private companies, particularly startups and scale-ups, shares are awarded to employees, founders or advisors and are often subject to vesting schedules or leaver provisions. Where a shareholder leaves the business – whether as a ‘good leaver’ (for example, due to illness or redundancy) or a ‘bad leaver’ (such as resignation or dismissal for cause) – the company may have the right, or even the obligation, to buy back their shares. The terms of the buyback, including price and process, are usually set out in a shareholders’ agreement or investment documents. A properly structured buyback ensures that unvested or leaver shares are dealt with cleanly and in accordance with those terms.
• Tidying up the cap table
  • Over time, a company may accumulate a long list of minority shareholders – often from seed rounds or employee share schemes. A buyback can help simplify the shareholding structure.
• Returning surplus cash to shareholders
  • If a company has more cash than it needs and doesn’t plan to reinvest it, a buyback can be a tax-efficient way of returning money to shareholders, subject to meeting certain criteria.
• Consolidating control
  • Majority shareholders may wish to increase their percentage ownership by buying out smaller shareholders through a company buyback.

Legal and compliance issues to consider

Before going ahead with a buyback, there are several important legal and regulatory hurdles to clear:

• Authority in the Articles of Association
  • The Companies Act 2006 governs how and when a company can purchase its own shares.  It’s essential to check:
    • whether the company’s articles of association prohibit share buybacks
    • that the shares being bought back are fully paid
    • that there are sufficient distributable profits or permissible capital to fund the buyback
    • If the Articles prohibit buybacks (or are silent), they may need amending first.
• Consideration type
  • A buyback must be for cash, unless one of the statutory exceptions applies.  Using non-cash consideration can lead to the transaction being void.  There are a few limited statutory exceptions to this rule, for example, where the buyback forms part of an employees’ share scheme. But in most cases, payment must be made in cash.
  • In addition, the full amount of consideration must be paid at the time of purchase, instalment payments are not permitted under the Companies Act.  This is a common area of confusion, particularly where the seller is a departing founder or employee and the company prefers to spread the payments.  If staged payments are commercially necessary, a staged buyback, where a series of smaller buybacks are carried out over time, can be a lawful alternative. However, each stage must still follow the correct legal process and filings.
• Funding the buyback
  • There are only three ways to fund a lawful buyback under the Companies Act:
    • out of distributable profits
    • out of capital (subject to a more stringent procedure)
    • out of the proceeds of a fresh issue of shares made for the purpose of the buyback
  • Funding out of capital is more complex and involves additional steps, including a solvency statement, auditors’ report and public notice.
  • If the company does not have sufficient distributable profits to fund the buyback, one option is to first create a distributable reserve by reducing the company’s share capital or share premium account.  This can be done using the Companies Act solvency statement procedure, which is significantly simpler and less costly than the full procedure required for a share buyback payment out of capital. It’s a more popular and practical route, particularly for private companies, as it avoids the need for auditor involvement and public notice.  Once the reserve has been created, the buyback can then be lawfully funded out of distributable profits in the usual way.
• Tax implications
  • Buybacks will have income tax or capital gains tax consequences for the seller. It’s essential to get tax advice, especially where the aim is for capital treatment under HMRC’s rules (e.g. in retirement or shareholder exit scenarios).
• De minimis exception
  • In some cases, a company may be able to rely on the de minimis exception under section 692(1ZA) of the Companies Act 2006.  This allows a private company to buy back a small number of shares out of capital without following the full capital reduction procedure – provided that the total payment does not exceed the lower of £15,000 or 5% of the aggregate nominal value of the company’s fully paid share capital in any financial year.
  • While not commonly used, it’s a helpful exception to be aware of, particularly where the company wants to clean up a minor shareholding or tidy up following a leaver.  It’s worth checking whether this is an option before proceeding with the full process.

The legal documents and steps involved

The process for a share buyback requires a number of steps and documents, summarised below.

• Step 1: Check the Articles of Association
  • Review and, if necessary, amend the Articles to allow for share buybacks. You’ll need a special resolution if changes to the Articles are required.
• Step 2: Draft the share buyback agreement
  • This is a formal contract between the company and the selling shareholder.  It will usually include:
  • number and class of shares to be bought
  • price and payment method
  • completion mechanics
• Step 3: Board resolution
  • The board should approve the buyback and confirm that it is in the best interests of the company. If payment is from the company’s distributable profits, the board should consider relevant accounts to confirm the required level of distributable profits and the company’s ongoing solvency. Board minutes should clearly and formally record this.
• Step 4: Shareholder resolution
  • A special resolution (75%) is required for a buyback out of capital. For a buyback out of distributable profits, only an ordinary resolution (50%) is needed, unless the Articles impose a higher threshold.
  • The shareholder who selling shares cannot vote on the resolution in respect of the shares being bought.
• Step 5: Complete the buyback and cancel the shares
  • On completion:
    • the company pays the agreed amount to the seller
    • the shares are cancelled and removed from the register
    • Form SH03 and (if the shares are being cancelled) Form SH06 must be submitted to Companies House within 28 days
    • stamp duty at 0.5% is payable if the price exceeds £1,000.  HMRC must stamp the SH03 before it is filed at Companies House
• Step 6: Update the statutory registers
  • The company’s register of members must be updated to reflect the buyback and cancellation of shares.

Where things go wrong and how to avoid it

Many share buybacks are delayed or invalidated by simple  – but potentially costly – mistakes.  Here’s what to watch out for:

• Incorrect process or missing steps
  • A common mistake is failing to execute a buyback agreement or to pass the required shareholder resolution.  In their absence, the buyback may well be void.
  • Another frequent error is agreeing to pay in instalments, which invalidates the buyback.  The full consideration must be paid at the time of purchase. 
  • These issues are often not picked up until due diligence, when a company is being sold or taking on external investment.  If the buyback wasn’t lawfully completed, it can trigger red flags for buyers and investors, sometimes requiring the company to redo the entire process.  In some cases, a formal application to the court for validation may be necessary – a costly and time-consuming fix that could easily have been avoided with the right documents and advice at the outset.
• No or inadequate authority in Articles
  • Review the Articles early to ensure that the company can legally carry out the buyback.
• Funding issues
  • Attempting to fund a buyback out of capital without following the required procedure (including the solvency statement and supporting documents) can render the buyback void and expose directors to personal liability.
• Stamp duty not paid or filed late
  • If the buyback exceeds £1,000 and stamp duty is not paid within 30 days, penalties and interest can apply.  Worse, Form SH03 won’t be accepted by Companies House unless it’s properly stamped.
• Not seeking tax advice
  • Shareholders expecting capital gains tax treatment may face an unexpected income tax bill if the buyback isn’t structured correctly or the shareholder doesn’t qualify for capital gains tax treatment. Always involve a tax adviser early.

Final thoughts

A share buyback can be a valuable strategic tool – but only if handled carefully and in line with company law. The consequences of getting it wrong range from delays and fines to the transaction being void altogether.

At PaperRock Documents, we offer a complete set of professionally drafted templates to help you manage a buyback with confidence. Our documents include:

• a fully compliant share buyback agreement
• board and shareholder resolutions
• detailed guidance notes 

Leading English lawyers create each template and each includes comprehensive guidance notes for completion.