> ## Content Index > Fetch the complete content index at: https://entrepreneurplus.co.uk/llms.txt > Use this file to discover other available public pages before exploring further. # Company Share Buybacks and the Rules UK Founders Must Follow - URL: https://entrepreneurplus.co.uk/company-share-buybacks-and-the-rules-uk-founders-must-follow/ - Published: 2026-10-13T10:00:00.000Z - Updated: 2026-10-13T09:59:59.000Z - Description: When a founder or early employee leaves, who buys back their shares? Company share buybacks give UK startups a way to restructure ownership, but the process involves strict legal procedures, funding rules and tax considerations. Here’s what founders need to know before proceeding. - Author: Editorial Desk - Tags: Startup Toolkit A **company share buyback** lets a UK private company repurchase shares directly from a departing shareholder, using company funds so no other founder has to buy them personally. For a startup losing a co-founder or early hire, it can be an effective way to restructure ownership, provided the articles, statutory procedure and funding rules are met. Part 18 of the **Companies Act 2006** governs the process. A company may buy back its own shares unless its articles restrict it (s690). Every private company buyback is “**off-market**”, meaning the shares don’t trade on a recognised investment exchange. --- ## Why Founders Use a Share Buyback to Remove a Leaver Founders use a **company share buyback** when a leaver’s shares need to return to the business and nobody wants to buy them personally. The company becomes the purchaser instead of another individual. A **founder share buyback** is one option when a co-founder exits and the remaining team doesn’t want shares sitting with someone who no longer works in the business. It may also suit an employee who joined through a share scheme, or a cap table that needs tidying. A transfer to another shareholder can be simpler. A buyback needs company funds and a formal process, and the shares are normally cancelled unless held in treasury. --- ## Good Leaver vs Bad Leaver Shares Good leaver and bad leaver shares can change what a departing shareholder receives, but the outcome depends on your contracts, not the Companies Act 2006. **Good leaver and bad leaver shares** aren’t statutory categories. Founders and investors negotiate them in the shareholders’ agreement, the articles and any share scheme documents. Those documents can decide whether a leaver must sell, who can buy and how the price is calculated, subject to applicable law. | Criteria | Good leaver | Bad leaver | | --------------- | ---------------------------------------------------- | ---------------------------------------------------- | | Typical trigger | Redundancy, retirement, ill health, mutual agreement | Misconduct, fraud, material breach | | Price | Often fair value, if the documents say so | Often nominal or discounted, if the documents say so | Leavers and remaining founders regularly disagree on which category applies. Define the triggers precisely on day one. --- ## How the Company Share Buyback Process Works A private company buys back shares by approving the contract with a special resolution, paying in full on purchase, and **filing Form SH03 within 28 days**. A special resolution needs 75% of votes. The leaver can’t vote on it, and on a written resolution they aren’t an eligible member (s695). You must also send members a copy of the contract, or a memorandum of its terms, with the resolution. Skip that and the resolution isn’t validly passed. The company must pay for the shares in full on purchase. Only buybacks for employees’ share schemes can pay by installments. HMRC’s manual repeats the point: a valid purchase needs full cash payment. Once the shares are delivered, file Form SH03 with Companies House within 28 days. Missing the deadline is an offence. If you cancel the shares immediately, file Form SH06 too. Treasury shares have separate filing rules. If Stamp Duty is due, send the SH03 to HMRC’s Stamp Office before filing. --- ## Funding the Buyback: Profits, a New Issue or Capital Most private companies fund a company share buyback from distributable profits or from a fresh share issue made specifically to pay for the purchase (s692). A private company can also pay out of capital, but the process is heavier. It needs a special resolution, a directors’ solvency statement, an auditor’s report and a public notice for creditors. For small deals, if the articles authorise it, a private company can use cash outside the capital procedure up to an aggregate purchase price in a financial year of the lower of £15,000 or the nominal value of 5% of its fully paid share capital at the start of that year. --- ## What Goes Into a Share Buyback Agreement A share buyback agreement is the contract between the company and the leaver that fixes the price, the number of shares and the completion terms. It names the company and the seller, records the share capital, sets the consideration and includes completion mechanics and standard warranties. Timing matters. You can sign before shareholders vote, provided the contract says no shares will be bought until a special resolution approves its terms (s694). Replace the **share buyback agreement** with an informal arrangement and you don’t have a valid buyback. The leaver may still legally hold the shares. --- ## Tax Treatment: Capital vs Income Distribution HMRC treats a company share buyback as an income distribution unless the seller meets every capital treatment condition in Corporation Tax Act 2010 section 1033 onwards. The company must be an unquoted trading company, and the purchase must benefit its trade. The seller’s interest must fall to 75% or less of what it was before. Afterwards, the seller can’t hold **more than 30% of the share capital**, loan capital or voting rights, and associates’ holdings can count. ![share buyback tax calculations](https://storage.ghost.io/c/05/a4/05a4a052-18ab-4836-8924-ec8b322c371c/content/images/2026/10/Cinematic-Financial-Workspace-with-City-Views.png) share buyback tax calculations The purchase can’t be part of a tax-avoidance scheme, and the seller must meet residence and ownership-period rules. Capital treatment is not automatic, so check every condition before completion. The rate gap is large. Income treatment means dividend tax above the £500 allowance: 10.75% basic, 35.75% higher and 39.35% additional rate for 2026-27\. Capital treatment means **Capital Gains Tax at 18%** within the basic-rate band and 24% above it, after a £3,000 annual exempt amount. Business Asset Disposal Relief charges 18% on qualifying gains, up to £1 million, but a buyback doesn’t qualify automatically. You can apply to HMRC for advance clearance under section 1044; check HMRC’s current guidance for response times. If the company believes capital treatment applies, it must also report to HMRC within 60 days of payment, even with clearance. Stamp Duty applies at 0.5% of the consideration, rounded up to the nearest £5. --- ## Common Mistakes Founders Make When Buying Back Equity The most common mistake in a founder share buyback is treating it like a casual private deal when it’s a regulated company law transaction. - **Skipping the documents:** Your articles or shareholders’ agreement may restrict a buyback. Check both before agreeing a price. - **Assuming the cash is there:** Profits, a new issue and capital each follow different rules. - **Skipping HMRC clearance:** It’s optional, but without it you won’t know whether capital treatment applies. - **Confusing clearance with the return:** The 60-day return is separate and applies where you claim capital treatment. - **Leaving leaver wording vague:** Vague triggers invite disputes. --- ## FAQs ### 1\. What is a good leaver and a bad leaver in a shareholders’ agreement? Good leaver and bad leaver are contractual labels, not statutory terms. A good leaver typically departs through redundancy or ill health, a bad leaver through misconduct or breach. Your shareholders’ agreement decides whether the leaver must sell and at what price. ### 2\. How is a share buyback taxed in the UK? HMRC taxes a company share buyback as an income distribution by default. Capital gains treatment applies if the company is an unquoted trading company and the seller meets the reduction, connection and other conditions in the Corporation Tax Act 2010\. For 2026-27, CGT is 18% or 24%. ### 3\. Can a company force a shareholder to sell their shares back? Only if a contract says so. The Companies Act 2006 gives no general right to compel a sale. The shareholders’ agreement, articles or share scheme documents decide whether a leaver must sell and on what terms. **Also Read:** [*Employer National Insurance: What UK Startups Pay in 2026*](https://entrepreneurplus.co.uk/employer-national-insurance-what-uk-startups-pay-in-2026/) --- *Sources: Companies Act 2006 (Part 18, ss690–707); Companies Act 2006 (Amendment of Part 18) Regulations 2013 and 2015; Corporation Tax Act 2010 (ss1033–1046); HMRC Company Taxation Manual (CTM17505, CTM17580) and Capital Gains Manual (CG58641, CG58644); gov.uk guidance on Capital Gains Tax and tax on dividends. Figures reflect the most recent available rates at the time of writing.* ***The EP+ Editorial Desk covers UK startups, founder stories, and venture capital. All editorial content is independently produced and human-reviewed before publication.***