By Chris Barnard
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February 24, 2026
If you run an SME, you sometimes wonder if the government is on the same side as you. It sees that profitability is a reason to be punished rather than celebrated. As soon as your business becomes successful, the rules seem to change. Reliefs fade away, thresholds become tougher, and costs rise. It makes you wonder: wasn’t growth supposed to be the goal? This is not a political argument, but an analysis of the underlying incentives. The current UK tax system tends to reward businesses that remain small, while making expansion and increased profitability more challenging. Here are three main reasons why this issue matters. 1) The jump from 19% to 26.5%. a marginal rate that feels like a trap Most small company owners know the headline Corporation Tax rates: 19% on profits under £50,000 and 25% on profits over £250,000 (with marginal relief in between). But what really hurts is what happens in the middle. Between £50,000 and £250,000, the effective marginal Corporation Tax rate is 26.5%. Put simply, every extra £1 of profit in this range can be taxed at 26.5p. This is higher than the main rate of 25%. The reason is that the system takes back the benefit of the 19% small profits rate as your profits increase SME owners dislike this because it doesn’t feel like a smooth transition. Instead, it feels like entering a growth zone where the reward for extra profit is less than expected. A simple example: Company A makes £50,000 profit: taxed at 19%. Company B makes £80,000 profit: that extra £30,000 sits in the marginal band and is effectively taxed at 26.5%. Yes, it’s complicated! As soon as your business grows beyond the small category, the system takes a larger share of each extra pound you earn. Some might say you’re still better off overall, but that misses the point. Tax policy doesn’t just collect money; it also influences behaviour. This setup encourages business owners to keep profits below certain levels, hold back growth, delay invoicing, reinvest only when necessary, and avoid too much success in a single year. 2) Allowances that shrink as your business grows In the UK, as you earn more, you’re not just taxed at higher rates. Helpful allowances also quietly shrink as your business grows. Here are two examples that small business owners notice right away: Dividend allowance quietly eroded Although not primarily designed to support owners of businesses, the dividend allowance was a simplification measure for people with small amounts of dividend income (often retirees or casual investors), so they wouldn’t need to complete a tax return just because they held shares. The allowance has been cut from £5,000 to just £500 over a few years, which is a 90% reduction. That’s classic stealth taxation: no headline rate rise, just a shrinking tax-free slice that pulls more people into paying tax. For company directors who rely on dividends as part of normal remuneration, today’s allowance is effectively negligible. Exit relief has become more limited. Entrepreneurs’ Relief (now BADR - Business Asset Disposal Relief) was dramatically reduced from a £10m lifetime limit to £1m in 2020. The CGT rate under BADR increased to 14% for disposals from 6 April 2025 (it was 10% before) and goes up again to 18% in April 2026. It is effectively a stealth tax. If you’re building a business with plans to sell it, step back, or fund something new in the future, these changes are important. The system’s message is clear: you can start a business, but if you become too successful, the incentives become less generous. This doesn’t encourage a pro-growth culture. 3) Employer NIC rises Hiring in the UK has always been costly when you include extra expenses. Recent changes to employer National Insurance have made this even clearer. From 6 April 2025: Employer Class 1 NIC rate increased from 13.8% to 15% Secondary Threshold reduced from £9,100 to £5,000 One positive change was the Employment Allowance has increased from £5,000 to £10,500 and the old £100,000 eligibility restriction was removed. This does reduce NIC bills, but not enough to match the punitive measures announced. The usual message is that those who can afford it should pay more. In reality, employer NIC is a tax on jobs. When it increases, it affects hiring decisions directly, not just large companies. A simple NIC example: one employee on £25,000 (roughly minimum wage) Before the changes (2024–25 rules) Employer NIC rate: 13.8% Employer NIC threshold: £9,100 Employer NIC is paid on earnings above £9,100. £25,000 – £9,100 = £15,900 Employer NIC at 13.8% = £2,194 Total cost to employer: Salary: £25,000 Employer NIC: £2,194 Total: £27,194 After the changes (from April 2025) Employer NIC rate: 15% Employer NIC threshold: £5,000 Employer NIC now starts much earlier. £25,000 – £5,000 = £20,000 Employer NIC at 15% = £3,000 Total cost to employer: Salary: £25,000 Employer NIC: £3,000 Total: £28,000 The difference Extra cost per employee: ~£806 per year That’s before pension contributions, training, software, equipment, sick cover or any pay rises. While the Employment Allowance has increased to £10,500, once a business has several employees, that allowance is quickly absorbed. After that point, every additional hire permanently costs more under the new system. So, if you have no employees, you could be missing out on this employment allowance. Directors aren’t exempt either This doesn’t just affect growing teams. It also hits single-director companies where the director pays themselves a modest salary and takes the rest as dividends. A common structure is a director salary of £ 1,045 per month (£12,540 a year), set around the personal allowance. Under the old rules, this often resulted in little or no employer NIC. From April 2025, that changes. Employer NIC now starts above £5,000 , not £9,100 Employer NIC rate rises to 15% For a sole director on £12,540: £12,540 – £5,000 = £7,540 subject to employer NIC Employer NIC at 15% = ~£1,130 per year With no other employees, many directors cannot benefit meaningfully from the Employment Allowance, so this becomes a straight additional cost for simply running a company. Think about hiring another employee so you can claim this employment allowance. So, what happens? fewer hires slower wage growth more reliance on contractors investment delayed automation suddenly looks “more affordable” than people This isn’t because business owners are at fault. It’s because the financial realities force them to make tough choices. The old-school truth: it’s easier to stay small When you look at all three issues together, a pattern emerges: grow profits past £50k, and your marginal Corporation Tax rate jumps to 26.5% pay yourself and the “allowances” feel more like admin than support hire people, and the costs keep rising This is why many SME owners feel that the UK punishes profitable small businesses. It’s not due to one big policy, but a series of rules that make it harder to be ambitious. Knowing all the reliefs and rules available can make it more affordable to grow, but need a good accountant in your corner. Is this new, or have we always been like this? There have been periods of genuine support for small businesses. For instance, Entrepreneurs’ Relief was introduced in 2008 to incentivise entrepreneurialism and business growth, before being later restricted. And for a long stretch (2017-2022), Corporation Tax was effectively a flat 19% for most companies, which felt simpler (it was even more confusing before 2017) and more predictable than today’s banded system. The UK has supported small businesses in the past. But over time, the system has become more focused on clawbacks, often confusing fairness with unnecessary obstacles. How do other countries make growth feel easier? Many countries design policies to make reinvestment and scaling feel more natural. Ireland taxes trading income at 12.5% Corporation Tax Estonia has a well-known system where retained and reinvested profits are taxed at 0%, and tax is mainly due when profits are distributed. Across the OECD, statutory corporate tax rates fell over the long term (2000 to 2019) and have since stabilised, reflecting an international focus on competitiveness. These examples aren’t perfect solutions for the UK, but they show a different approach: making reinvestment and growth the standard, not something special you have to work around. So, what should be done? If the UK truly wants more productive and growing SMEs, the government needs to send clearer signals. Right now, the message is: You can start a business. But if you get profitable and start hiring at pace, we’re going to take more, remove more, and make it all a bit more complicated. That’s why so many talented founders end up aiming lower than they could. It’s time to think bigger. It’s also time to think smarter. If you want to find out how to be more tax efficient, please get in touch. Frequently Asked Questions (FAQs) on Tax and Profitability for UK Small Businesses 1. Why does Corporation Tax jump to 26.5% for some small businesses? The 26.5% marginal Corporation Tax rate applies to profits between £50,000 and £250,000 due to the phased withdrawal of the 19% small profits rate. This creates an effective tax “trap” where each extra £1 of profit in that band is taxed more heavily than profits above £250,000. 2. What is marginal relief and how does it work? Marginal relief gradually removes the benefit of the 19% rate as your profits increase. It’s designed to smooth the transition, but in practice it creates a steep effective tax rate of 26.5% on profits within the band—making growth feel penalised. 3. How have dividend allowances changed? The dividend allowance has been reduced from £5,000 in 2016/17 to just £500 from April 2024. This means most dividends taken by directors are now taxable, even at relatively low levels, significantly increasing personal tax bills. 4. What is BADR and how has it changed? Business Asset Disposal Relief (formerly Entrepreneurs’ Relief) now applies to a much smaller lifetime limit (£1m, down from £10m) and the Capital Gains Tax rate is rising to 18% by April 2026. These changes reduce the tax efficiency of exiting or selling a business. 5. How are employer National Insurance contributions changing in 2025? From April 2025, the employer NIC rate rises to 15%, and the threshold drops to £5,000. While the Employment Allowance increases to £10,500, these changes increase the cost of hiring and maintaining payroll—even for minimum-wage employees. 6. Does this affect sole director companies too? Yes. Directors who pay themselves a modest salary (e.g. £12,540) will now face employer NIC charges starting from £5,000. For many single-director companies, this means an extra £1,130 in tax per year without any real benefit in return. 7. Why does it feel like it’s easier to stay small? The UK tax system currently removes or reduces reliefs as businesses grow. From higher marginal tax bands to more complex allowances and rising employer costs, these rules create a perception—and often a reality—that scaling is penalised rather than encouraged. 8. What can I do to reduce the impact of these tax changes? Smart planning is key. Understanding the thresholds, making use of available allowances, and structuring your remuneration, reinvestment, and hiring strategies carefully can all reduce your tax burden. The right accountant can help you plan for growth, not punish you for it.