The sole trader vs limited company question comes up constantly, and for good reason — the choice has real consequences for how much tax you pay, how much admin you carry, and what happens if things go wrong. It is not a decision you should make because someone in a Facebook group told you incorporation is always more tax-efficient, or because you heard that limited companies sound more professional.

We have been helping small businesses and contractors work through this at Supreme Consulting for over 20 years. Our general view is that incorporation makes sense for a specific set of circumstances, and for plenty of people it does not — at least not yet. This post sets out the factors we actually weigh when a client asks us which way to go.

Most people frame this as a binary: sole trader bad, limited company good, or vice versa. The more useful frame is to ask what you actually need from your business structure right now.

As a sole trader, you and the business are legally the same entity. Your profits are your income, taxed through Self Assessment via income tax and Class 4 National Insurance. The setup is minimal — register with HMRC and you are trading. Your financial affairs stay private. You file one return a year.

A limited company is a separate legal entity. It pays corporation tax on its profits, and you extract money from it as a salary, dividends, or both. It requires registration at Companies House, and your accounts and director details become publicly visible. The compliance burden is meaningfully higher.

Neither of those things is inherently good or bad. They are just different tools, and the right one depends on your profit level, your appetite for admin, your exposure to commercial risk, and whether your clients or industry expect or prefer one structure over the other. Starting with those questions produces a better answer than starting with a general preference for one structure.

The tax case for a limited company is real, but it has a threshold. As a sole trader, all your profits are subject to income tax at 20%, 40%, or 45% depending on the band, plus Class 4 National Insurance on profits above the lower profits limit. There is no flexibility in how you extract money — profit is income, and it is taxed as such.

Inside a limited company, you pay corporation tax on profits: 19% on profits up to £50,000, rising to 25% on profits above £250,000, with marginal relief for the band in between. As a director, you can draw a low salary to stay within the personal allowance and take the remainder as dividends, which are taxed at lower rates than equivalent employment income.

The saving is real once profits reach a meaningful level. A commonly cited crossover point is somewhere around £30,000 to £40,000 of annual profit, though the precise figure depends on your personal circumstances, whether you have other income, and whether you can legitimately leave some profit inside the company rather than extracting it all.

What that calculation often omits is the additional cost of running a limited company — higher accountancy fees, payroll administration, and the time cost of greater compliance. The net tax saving for someone with profits of £35,000 may be smaller than it first appears once those costs are factored in. We always run the numbers for clients before recommending either way.

One of the most underestimated parts of the sole trader vs limited company comparison is the difference in ongoing administration. As a sole trader, your annual obligation is one Self Assessment return. For most people, that is straightforward.

A limited company requires annual statutory accounts filed at Companies House, a corporation tax return (CT600) filed with HMRC, an annual Confirmation Statement, and — if you draw a salary — a payroll scheme with PAYE and RTI submissions. If the company is VAT registered, add quarterly VAT returns to that list.

None of this is unmanageable, particularly if you have a good accountant handling it. But it does add cost and complexity. A sole trader paying £300 per year for a Self Assessment return and a limited company paying £1,200 or more per year for the full compliance stack are not on equal footing when comparing their respective tax positions.

For someone with modest profits and straightforward affairs, the additional compliance cost of a limited company can meaningfully erode, or entirely wipe out, the theoretical tax saving. The administration burden also lands on you in terms of keeping records clean and responding to filings on time. If that is not something you want to take on, it is worth being honest about that before you incorporate.

One of the clearest arguments for a limited company is limited liability. Because the company is a separate legal entity, your personal assets are generally protected if the business runs into financial difficulty. As a sole trader, there is no such separation — business debts are your debts.

That protection matters most if you carry real commercial risk: significant client contracts, equipment on credit, or exposure to professional liability claims. For a freelance copywriter or a small trades business with no credit lines, the liability argument is less compelling in practice.

It is also worth noting that limited liability does not always hold. If you personally guarantee a business loan — which most high-street banks will require for a new company — you have assumed personal liability for that debt regardless of structure. The protection is real, but it has limits.

On perception: there is a persistent view that limited companies look more credible to corporate clients. This is sometimes true. Larger businesses, particularly in sectors like professional services, technology, and construction, will occasionally have a preference for contracting with a limited company. If the clients you are targeting sit in that category, it is worth factoring in. For most small business-to-consumer relationships, structure rarely comes up.

If you work as a contractor — providing services to a single client or a small number of clients — the limited company question has an additional dimension that sole traders do not face: IR35.

The off-payroll working rules (IR35) apply to contractors who provide services through their own limited company or partnership to medium and large businesses. If your client decides that your working arrangement looks more like employment than genuine self-employment, they are required to treat you as an employee for tax purposes, deduct income tax and National Insurance from your fees, and pay employer National Insurance on top. The tax benefit of your limited company disappears entirely in that scenario, and you are left with higher compliance costs and no meaningful advantage.

Sole traders who contract directly do not fall within IR35 — they are already self-employed for tax purposes, so the rules simply do not apply to them. For some contractors, particularly those on longer-term engagements with larger businesses that have determined their role falls inside IR35, operating as a sole trader may actually produce a cleaner financial outcome than maintaining a personal service company.

This is an area where the specifics of your contracts, your working practices, and your client base matter enormously. It is one of the situations where a conversation with an accountant before making a decision will save you from a costly mistake later. You can read more about how IR35 works and what has changed in our resources section.