UK Founders’ Relief: the 10% CGT rate will matter only if it retains scale-up value

A back-loaded incentive cannot substitute for the conditions that create scale-ups

Founders’ Relief should be judged as a selective attempt to retain more of the value created by successful UK businesses, not as a general remedy for weak business formation or a substitute for a scale-up strategy. Subject to legislation, the proposal would apply a 10% Capital Gains Tax rate to up to £10 million of qualifying gains from eligible disposals on or after 6 April 2027. The stated objective is to make the UK more attractive to founders and significant early investors who start, scale and retain high-growth, innovative businesses. (HM Treasury, 2026) ↗

That aim matters because the UK’s challenge is not simply the number of businesses created. The Office for National Statistics recorded 317,000 business births and approximately 2.86 million active businesses in 2024, but only 14,330 businesses met its employment-based definition of high growth. (Office for National Statistics, 2025) ↗ The policy question is therefore how more viable firms acquire the customers, finance, management capability, governance and workforce needed to become durable, productive businesses.

Founders’ Relief sits at the far end of that process. It may raise the expected after-tax return for taking entrepreneurial risk and may influence a founder with credible international options when choosing where to remain resident, locate senior decision-making or deploy capital after a sale. It cannot supply working capital, secure a first major customer, recruit an experienced leadership team or remove a regulatory constraint while a company is trying to grow.

This distinction sets the appropriate standard. The relief does not need to solve every obstacle facing a scale-up to be worthwhile. But an exit receiving a lower tax rate is not, by itself, evidence that the measure generated more UK economic activity. The relevant counterfactual is demanding: would the prospect of relief cause a business to be founded, retained, scaled or reinvested in the UK when that would otherwise have happened elsewhere, later, or not at all?

Targeting can limit windfalls, but it also defines which growth models count

The proposed regime is intentionally narrow. Individuals would need to meet conditions relating to ownership, voting rights, entitlement to profits and winding-up assets when the relevant trade began; hold shares for at least five years; and have been UK resident for at least five continuous tax years before disposal. The company would need a substantial UK presence, be within the UK Corporation Tax net, and meet turnover and employment conditions including at least £10 million of turnover and 15 qualifying full-time employees. (HM Treasury, 2026) ↗

In addition, the company would need to satisfy at least two of three indicators: 25% compound annual turnover growth over three consecutive periods; 25% compound annual growth in qualifying full-time employees over three consecutive periods; or at least £1.5 million of qualifying research and development expenditure claimed through R&D tax relief in the preceding three years. (HM Treasury, 2026) ↗

The rationale is credible. A broad exit relief would risk paying for ordinary disposals and gains that tax policy did little to create. The Institute for Fiscal Studies has cautioned more generally that entrepreneurship tax reliefs can be poorly targeted, rewarding activity that would have occurred anyway while failing to resolve deeper barriers to productive enterprise. (Institute for Fiscal Studies, 2026) ↗ Conditions linked to scale and innovation are an effort to concentrate fiscal support where potential economic spillovers are thought to be greatest.

Yet targeting creates a second problem: objective tests necessarily embed a view of what a valuable growth business looks like. Headcount is readily observable, but it is not a direct measure of productivity, export potential or UK value creation. A firm based on intellectual property, licensing, automation or a small specialist workforce may make a substantial domestic contribution without rapidly increasing qualifying employee numbers. Conversely, rapid hiring can be commercially fragile. The R&D route widens access, but HM Treasury recognises its limitations as an innovation measure: commercially important innovation may not generate qualifying R&D expenditure, while qualifying expenditure does not establish commercial success. (HM Treasury, 2026) ↗

There is a further incentive-design tension. The tests seek to identify firms that have already achieved scale or innovation, but an incentive can alter behaviour only if founders can reasonably anticipate qualifying before they make long-term choices. Rules that are too permissive increase windfall cost; rules that are too complex or dependent on uncertain future classification reduce the expected value of the relief. This is particularly salient for spin-outs, companies with multiple share classes, founder vehicles, later dilution and restructurings. A regime can be selective without being tailored solely to the simplest venture-backed company history.

The economic case rests on marginal decisions, not the size of the tax saving

The strongest argument for Founders’ Relief is behavioural. Entrepreneurial returns are uneven: many ventures fail or yield modest returns, while a small minority produce substantial gains. A stable reduction in tax on the successful outcome can increase the expected reward for early risk. For founders with genuinely mobile options, it could affect choices about location, residence, senior leadership and the destination of later investment. The proposed UK-residence and company-presence conditions are intended to connect the tax advantage to domestic activity. (HM Treasury, 2026) ↗

The size of that response is uncertain. In its response to the call for evidence on tax support for entrepreneurship, the Government reported that respondents generally regarded tax as one factor in post-exit reinvestment decisions rather than the most important one. Opportunity quality, networks, access to finance, personal circumstances, risk appetite, regulation and confidence in the wider business environment also shape those decisions. (HM Treasury, 2026) ↗

That evidence should not be read as meaning tax is irrelevant. A factor need not be decisive in most cases to affect a small number of high-value, marginal decisions. It does mean that the policy should not be presented as a proxy for the wider conditions that enable entrepreneurship. Its causal pathway is narrower: the relief may improve the UK’s relative offer at the point where a successful founder is deciding whether to keep people, capital, expertise and future commercial activity connected to the UK.

Fiscal cost makes that discipline necessary. The Office for Budget Responsibility records an Exchequer cost of £260 million in 2027–28, rising to £300 million in 2031–32. (Office for Budget Responsibility, 2026) ↗ This does not settle the policy case against the relief. It clarifies the return that should be required: demonstrable retention of UK entrepreneurial capability and taxable activity, or additional repeat investment in firms that create productive, durable value.

Administrative certainty is part of the incentive, not an afterthought

The relief’s practical credibility will be formed years before a disposal. Eligibility would depend on evidence accumulated through the life of the company, while a claim would be made through Self Assessment at or after disposal. Historic details of ownership, the original trade, turnover, qualifying employee numbers and R&D claims will often sit with the company rather than with an individual shareholder. HM Treasury therefore proposes a statutory right for a claimant to request necessary information from the company. (HM Treasury, 2026) ↗

This is commercially significant. By exit, a founder may no longer be on the board, may have been diluted, or may not have direct access to records. A buyer and target company may also need to manage requests from former shareholders. Reliance on historic R&D claims adds a further exposure: where a relevant claim is later found invalid, the founder could lose relief and face additional tax and interest. (HM Treasury, 2026) ↗ If the probability of qualification is opaque, the headline 10% rate carries less weight in an entrepreneur’s decision-making.

Sanctuary recommendation: companies approaching the proposed thresholds should maintain a proportionate annual evidence pack. This should include a dated cap-table history; records of the original trade and material changes; documented turnover and qualifying-employee calculations; references and supporting material for relevant R&D claims; and a controlled process for responding to legitimate former-shareholder information requests. Good records cannot make an ineligible company eligible, but they can reduce avoidable friction in fundraising, a sale process and a personal tax claim.

For policymakers, the priority is worked guidance rather than simply more statutory detail. Examples should cover dilution, university spin-outs, founder departures, multiple share classes, restructurings and non-standard workforce models. A dependable mechanism for obtaining a view in complex cases before a transaction, where feasible, would strengthen the policy’s behavioural force. An incentive intended to influence decisions over five or more years cannot rely on founders discovering its real meaning only after the relevant decisions have been made.

Measure retained value and repeat entrepreneurship—not take-up

The Government estimates that around 600 individuals a year could be eligible for gains up to the £10 million limit, while around 400 businesses may need to determine whether company conditions are met. (HM Treasury, 2026) ↗ That selectivity means claim numbers will be a weak measure of success. High take-up could represent effective awareness, but could equally represent tax savings on exits that were already likely. Low take-up could indicate poor demand, overly restrictive design or uncertainty about compliance.

Sanctuary assessment: evaluation should be specified before implementation and focus on outcomes that map to the policy’s stated purpose. Relevant measures include retention of UK headquarters, intellectual property, senior decision-making and taxable activity; the durability of employment and turnover growth; founders’ continued participation in operating businesses; and subsequent investment in UK growth companies. These measures should be published at fixed intervals with appropriate protections for taxpayer confidentiality.

The evaluation design matters as much as the outcome list. Qualifying companies should be compared with carefully selected firms near, but outside, relevant thresholds. Analysts must account for the fact that firms able to meet the conditions are likely to differ from the average business before any relief is claimed. Without a credible comparison group, subsequent growth can be wrongly attributed to the tax measure when it reflects market conditions, capable management or pre-existing investor backing. The same caution applies to follow-on investment: a founder who backs another UK company after an exit may have done so regardless of the tax treatment.

The local dimension should also be explicit. A successful exit can generate expertise, purchasing power and repeat investment, but those benefits do not automatically spread beyond established entrepreneurial networks. Local business-support systems, investors and institutions remain important earlier in the conversion chain: helping firms validate customers, build management capability, strengthen governance, recruit and become investment-ready. Those capabilities are relevant not only to high-growth technology businesses but also to ambitious SMEs that underpin local employment and supply chains.

Founders’ Relief could modestly improve the UK proposition for a defined group of founders and early risk-takers. Its case is strongest where it retains the people, decisions and capital produced by successful businesses. To justify its fiscal cost, the final regime must be clear enough to shape behaviour, selective enough to reduce windfalls, and evaluated against evidence that more UK economic value has genuinely been created or retained.