Sole trader or limited company?

When I started out, I spent two weeks going back and forth on this question. Every forum gave a different answer. Most of it was wrong, or at least badly out of date. So here’s what I wish someone had told me.

The honest truth: most people overcomplicate this

The vast majority of people starting a small business in the UK should start as a sole trader. It takes about 10 minutes to register with HMRC. You’re done. You can always convert to a limited company later, and many people do once they’re actually making money and the tax advantages kick in.

The exception is if you’re doing something specific that requires the protection of limited liability from day one, or if you’re immediately operating above the £50,000 profit threshold where the tax maths genuinely shifts.

What’s the actual difference?

Sole trader means you and the business are legally the same entity. All business debt is your personal debt. Your profits are taxed as income tax. You pay Class 2 and Class 4 National Insurance. Simple.

Limited company means the business is a separate legal entity from you. You take a salary (taxed via PAYE) and dividends (taxed at a lower rate). You file accounts at Companies House, which are publicly visible. More admin, more cost, more credibility with some clients.

When a limited company actually makes sense from day one

There are a few clear scenarios where going limited from the start is worth the extra overhead:

You’re contracting B2B. Many larger companies, particularly in tech, finance, and the public sector, require you to operate through a limited company to engage you. If your first client is one of these, you have no choice.

IR35 concerns. If you’re doing work that looks like disguised employment, operating through a limited company at least gives you options (though it doesn’t protect you from an IR35 determination if HMRC disagrees).

You’re building something you plan to sell or take investment into. Investors put money into companies, not individuals. If raising capital is even a vague plan, start as a limited company.

Genuine liability risk. If your work could lead to significant financial claims against you (software that handles payments, advice that influences major decisions, physical products), limited liability matters.

The tax maths, simplified

As a sole trader, your profit is taxed at income tax rates: 20% (basic), 40% (higher), 45% (additional), after your personal allowance (£12,570 in 2025/26). Plus 9% Class 4 NI on profits between £12,570 and £50,270.

As a limited company director, the typical approach is: small salary (around £12,570, using your personal allowance, paying no income tax or NI) plus dividends for the rest. Dividends are taxed at 8.75% (basic rate), 33.75% (higher rate) after a £500 dividend allowance.

At £30,000–£40,000 profit, the difference is modest, perhaps £1,000–2,000/year. At £70,000+ profit, the limited company route saves substantially more.

My actual recommendation

Start as a sole trader unless you have a specific reason not to. Register with HMRC, get a separate business bank account (more on that next), and start tracking your income and expenses from day one.

If you’re still unsure, spend £100–150 on one hour with a UK accountant. The peace of mind is worth far more than the fee. The GOV.UK website also has good official guidance on both structures if you want to read the primary source.

Revisit the limited company question once you’ve got your first year’s numbers. By then you’ll know your actual profit level, whether you have B2B clients with requirements, and whether the admin overhead makes sense.