One of the most common questions we hear from clients — especially those hitting their stride in year one or two — is some version of: “Should I set up a limited company?” The benefits of a limited company vs sole trader are genuinely real, but they don’t apply equally to everyone, and the timing matters more than most guides let on.

At the start of 2025 there were 5.7 million private sector businesses in the UK, the vast majority of them small. A significant proportion trade as sole traders, and plenty of them could incorporate without any meaningful tax saving — at least at their current profit level. Others are leaving money on the table by waiting too long.

So rather than listing features side by side, we want to give you our actual view: what the limited company structure genuinely offers, where it falls short, and the rough point at which the conversation becomes worth having seriously.

The headline appeal of a limited company is tax efficiency. As a sole trader, all of your profits are subject to Income Tax and Class 4 National Insurance — you pay as you earn, and the rates climb quickly once you pass the basic-rate threshold. A limited company pays Corporation Tax on its profits first, and then you extract money as a combination of salary and dividends, which is typically more efficient.

Dividends are taxed at lower rates than employment income. From 6 April 2026, the dividend tax rates are 8.75% at the basic rate, 33.75% at the higher rate, and 39.35% at the additional rate — compared to Income Tax rates of 20%, 40%, and 45% respectively. The dividend allowance remains at £500 per year. So there is a real saving available, particularly for those operating in the higher-rate band.

Here is where we would add a note of caution, though. At lower profit levels — broadly speaking, anything under around £30,000 to £35,000 — the tax saving can be surprisingly thin. Some community discussions suggest sole traders can actually pay 1–2% less tax than a limited company at these lower profit levels, once you factor in the additional accountancy fees and filing costs that come with incorporation. The saving becomes meaningful as profits grow, and particularly once you are consistently drawing income above the higher-rate threshold.

The point is not that incorporation is a bad idea — it is that the timing should be driven by numbers, not habit or peer pressure.

Tax efficiency tends to dominate the conversation, but we think the liability protection offered by a limited company deserves equal attention — especially for trades and construction clients, professional service providers, or anyone who works with clients on significant contracts.

As a sole trader, there is no legal separation between you and your business. If a client makes a claim, a contract goes wrong, or a debt goes unpaid, your personal assets — your savings, your home — are exposed. A limited company is a separate legal entity. Its debts and liabilities sit with the company, not with you personally.

This matters more in some sectors than others. A freelance copywriter operating at modest turnover with professional indemnity insurance has a different risk profile than a sole trader builder taking on £80,000 contracts. For the latter, the liability question alone can justify incorporation, regardless of the tax position.

There is also a credibility dimension. Some larger businesses and public sector bodies simply prefer to contract with a limited company. It signals a degree of permanence and structure. We would not overstate this — plenty of sole traders win significant contracts — but it is a real commercial consideration, particularly if your ambition is to grow.

If sole trader operation has one clear advantage, it is simplicity. You register with HMRC, keep records, submit a Self Assessment return once a year, and that is largely it. The administrative burden is low, the filing obligations are minimal, and the costs are proportionate.

A limited company comes with considerably more. You will need to file annual accounts with Companies House, submit a Corporation Tax return (CT600) to HMRC, file a confirmation statement each year, run payroll if you pay yourself a salary, and — if applicable — manage VAT. Your accounts become publicly visible on Companies House, which some business owners find uncomfortable.

None of this is unmanageable, especially with a good accountant, but it does mean higher ongoing costs and more moving parts. Expect to pay more for accountancy support as a limited company than as a sole trader — which is money well spent if the tax saving justifies it, but a drag if it does not.

For contractors, there is another layer to consider: IR35. If you operate through a limited company and your client engages you on terms that look like employment, IR35 rules can remove the tax advantages entirely. It is not a reason to avoid incorporation, but it is something to assess properly before you set the structure up.

We are not going to give you a single magic number, because the right answer depends on your personal tax position, your sector, your appetite for admin, and your plans for the business. But here is roughly how we think about it when clients ask.

Incorporation starts to make clear financial sense once your profits are consistently above approximately £30,000–£40,000 per year, and the case strengthens significantly as you approach or exceed the higher-rate Income Tax threshold. At those levels, the combination of Corporation Tax rates and dividend extraction can produce a meaningful saving relative to the sole trader route — enough to comfortably outweigh the additional accountancy and compliance costs.

Beyond the numbers, we also tend to recommend a limited company structure when:

• You are taking on contracts where liability exposure is a genuine risk
• You want to retain profits in the company rather than draw everything out each year
• You are building a business you intend to scale, sell, or bring partners into
• Your clients or sector expect it

What we are more cautious about is the “everyone says I should incorporate” conversation — where a business owner in their first year, earning £25,000 profit, sets up a limited company because it sounds more legitimate. The structure should serve the business, not the other way around.