There is no universally better answer, and anyone who gives you one without asking about your profits, your risk and your plans is guessing. What follows is how the decision actually breaks down.
The two structures in one table
| Sole trader | Limited company | |
|---|---|---|
| Legal status | You and the business are the same thing | A separate legal person |
| Liability | Unlimited — personal assets at risk | Limited to what you put in, with exceptions |
| Tax on profits | Income tax and National Insurance on all profit | Corporation tax, then tax on what you take out |
| Setting up | Register with HMRC | Incorporate at Companies House |
| Filing | Self Assessment (and MTD if over the threshold) | Annual accounts, CT600, confirmation statement, payroll |
| Privacy | Details not published | Directors, accounts and PSCs on the public register |
| Getting paid | Draw money freely | Salary and dividends, with rules |
Liability: the argument that has nothing to do with tax
As a sole trader there is no line between you and the business. A claim against the business is a claim against your savings and, in the worst case, your home.
A limited company puts a wall there. It is not absolute — directors can be personally liable for wrongful trading, and lenders routinely ask for personal guarantees that dissolve the protection entirely — but for a business with physical risk, significant contracts or employees, it matters more than a few hundred pounds of tax.
If you are a consultant with professional indemnity cover and no staff, this argument is weaker than people assume.
Tax: where the crossover usually sits
As a sole trader you pay income tax and Class 4 National Insurance on your profit, whether or not you take it out of the business.
A company pays corporation tax on its profit. You then pay yourself — normally a small salary plus dividends — and pay personal tax only on what you actually take. Dividends are taxed at lower rates than salary and carry no National Insurance, which is where the saving comes from.
Two things follow. First, the benefit grows with profit, so at modest profits the tax saving is small or nil. Second, the benefit is much larger if you can leave profit in the company rather than drawing all of it.
Below roughly £30,000 of profit, incorporating rarely pays once you account for the extra accountancy and filing costs. Between £30,000 and £50,000 it depends heavily on how much you need to withdraw. Above that, it is usually worth modelling properly. Rates and thresholds move at every Budget, so treat this as a prompt to do the sums, not as the sums.
Admin: the cost nobody budgets for
A sole trader files one return a year — or, under MTD, quarterly updates plus a final declaration.
A company files annual accounts at Companies House, a corporation tax return with HMRC, a confirmation statement, and payroll submissions every time it pays a salary. Directors now also have to verify their identity with Companies House and provide a personal code. It is all manageable, and it is all deadlines.
Practically, a company costs more in accountancy fees. That cost has to come out of the tax saving before you call it a saving.
Credibility and access
Some clients — larger corporates, public sector bodies, certain agencies — will only contract with limited companies. Some lenders and insurers treat companies differently. If your target customers are enterprise buyers, the structure can be a gating factor regardless of the tax position.
Against that: a company's accounts and your role as director are public. Some people mind that; most don't.
Which way to lean
Stay a sole trader if your profits are modest, your risk is low, you need all the profit to live on, and you value simplicity. It is easy to start, easy to stop, and easy to change your mind about later.
Incorporate if your profits are comfortably into the higher rate, you can leave money in the business, you carry real liability risk, you plan to bring in investors or a co-owner, or your customers require it.
Changing from sole trader to limited company is straightforward, and most people who do it do it a year or two later than would have been ideal. Going the other way is more work but perfectly possible. The decision is important, not irreversible.
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Book a free 30-minute call →This article is general guidance based on the rules as we understand them at the date above, not advice for your situation. Tax rules change and thresholds are often updated at fiscal events — check the current position on GOV.UK or speak to us before acting on anything here.