One of the most common questions we get from growing sole traders is some version of this: “I keep hearing I should set up a limited company for the tax benefits — is it true?” The honest answer is yes, sometimes. But the gap between sole trader tax and limited company tax is narrower than a lot of people expect, and the decision involves more than just comparing headline rates.

In this post we share how we actually think about the sole trader tax vs limited company question when a client brings it to us. The maths matters, but so does the admin burden, the cost of running a company, and what stage your business is at. Get those wrong and the “tax saving” can evaporate before it reaches your pocket.

As a sole trader, your business profits are your personal income. You pay Income Tax on everything above your personal allowance (£12,570 for 2026/27), with the basic rate at 20% up to £50,270, the higher rate at 40% up to £125,140, and the additional rate at 45% above that.

You also pay Class 4 National Insurance Contributions on your profits — 6% between £12,570 and £50,270, and 2% above that. Class 2 NICs were abolished from 6 April 2024, so at least that flat weekly charge is gone. But Class 4 still adds a meaningful amount to your total bill once you move into the higher-rate band.

Here is the crux of the sole trader position: once your profits climb above the £50,270 basic rate threshold, every additional pound of profit is taxed at 40% Income Tax plus 2% Class 4 NIC — a combined 42% marginal rate. At that point, the comparison with a limited company starts to look genuinely interesting. Below that level, the difference is much smaller than most people assume.

A limited company pays Corporation Tax on its profits — 19% on profits up to £50,000 (the small profits rate), and up to 25% for profits above £250,000, with marginal relief in between. That is lower than the higher rate of Income Tax, and that gap is at the heart of why people incorporate.

The typical extraction strategy is a small salary — usually around the Secondary Threshold (£5,000 for 2025/26) to avoid Employer NIC — topped up with dividends from retained profits. The dividend allowance dropped significantly in recent years and now stands at just £500 tax-free for 2025/26 and beyond. Dividends above that are taxed at 8.75% (basic rate), 33.75% (higher rate), and 39.35% (additional rate) — these are lower rates than equivalent income, but dividends come from profits already taxed at Corporation Tax rates, so it is a two-stage system.

One flexibility advantage worth noting: a limited company gives you much more control over when and how you draw income. If you have a high-profit year, you can leave money in the company and draw it later — useful for smoothing tax across years. A sole trader has no such option; all profits are taxable whether drawn or not.

As a rough rule of thumb — and this is exactly what it is, a rule of thumb — the tax efficiency of a limited company tends to become meaningful when your profits exceed around £40,000 to £50,000 per year. Below that, the savings are modest. Above it, they can be more substantial, particularly once you are consistently in higher-rate Income Tax territory as a sole trader.

To illustrate without inventing specific figures: a sole trader earning £60,000 profit faces a significantly heavier combined Income Tax and NIC bill than a director-shareholder drawing the same economic value through a salary and dividend strategy from a company earning the same £60,000. The company route will generally produce a lower total tax cost — but not dramatically so once you factor in accountancy fees for annual company accounts, confirmation statements, Corporation Tax returns, and the cost of your own time dealing with more complex administration.

Our experience is that clients who incorporate at relatively low profit levels — say, under £35,000 — often find the tax saving is entirely consumed by the additional accountancy cost and their own compliance burden. That is not a good trade. The saving needs to meaningfully exceed the additional overhead before incorporation makes financial sense. If you want to run the numbers properly for your own situation, a sole trader vs limited company tax calculator can give you a useful starting point.

Tax efficiency is only one dimension of this decision, and not always the most important one. There are several things the pure numbers comparison misses.

Limited liability

A limited company separates your personal assets from your business liabilities. If your work carries meaningful financial risk — contracts with significant penalties, substantial client-facing liability, or large purchase commitments — that protection may be worth having regardless of the tax position.

Credibility and contracts

Some clients, particularly larger corporates or public sector bodies, prefer or require a limited company. If your growth plans depend on winning that kind of work, the structure decision is partly a commercial one.

Losses work differently

One thing that often surprises people: if your business makes a loss as a sole trader, you can offset that against other personal income in the same or prior year — useful if you have other employment or investment income. A company’s losses stay inside the company and cannot be passed up to shareholders. For a business in its early stages where losses are possible, this can make the sole trader route genuinely more flexible.

Timing of any switch

If you do decide to incorporate, the timing and how you handle existing assets and debts matters. Rushing the transfer without thinking through the implications can create unnecessary complications. We always advise clients to plan this properly rather than just filing Companies House paperwork and assuming the transition takes care of itself.