Sole Trader vs Limited Company for Tradesmen — When to Switch

The short answer

Start as a sole trader. Switch to a limited company when the maths justifies it.

For most tradesmen, that crossover point is somewhere around £40,000–£50,000 annual profit. Below that, the extra accountancy fees, admin, and compliance costs eat into whatever tax you'd save. Above it, the savings start to stack up.

This isn't a decision you make once and forget about. Your situation changes. What made sense at £30k profit doesn't necessarily make sense at £60k. And what works for a plumber doing domestic jobs is different from a joiner subcontracting on commercial sites.

The rest of this page walks through the comparison so you can make the call based on your numbers, not someone else's.

What you're actually comparing

Sole trader

• Simple setup. Register for Self Assessment with HMRC. That's it. No Companies House, no formation documents.
• One tax return per year. Self Assessment, due by 31 January. You report your income, deduct your expenses, and pay income tax plus National Insurance on the profit.
• You keep everything after tax. There's no separation between you and the business. The profit is yours.
• Unlimited personal liability. If the business owes money or gets sued, your personal assets are on the line. Your house, your van, your savings.
• Lower accountancy costs. Typically £500–£1,500 per year, depending on complexity and whether you're VAT-registered.

Limited company

• Separate legal entity. The company exists independently of you. It has its own bank account, its own tax obligations, its own legal identity.
• Tax-efficient pay structure. You pay yourself a low salary (usually around £12,570, the Personal Allowance) and take the rest as dividends. Dividends are taxed at lower rates than income.
• Limited liability. In theory, if the company fails, your personal assets are protected. More on this later.
• More paperwork. Annual accounts filed with Companies House. A confirmation statement every year. Corporation tax return. Payroll, even if you're the only employee. Director responsibilities under the Companies Act.
• Higher accountancy costs. Typically £1,000–£2,000 per year. Some charge more if they handle your payroll and VAT as well.

The numbers that matter

Here's a rough comparison at £50,000 profit. These are approximate figures for the 2025/26 tax year to show the shape of the difference. Your actual numbers will vary based on expenses, pension contributions, and other deductions.

Sole trader at £50k profit

• Income tax: £7,486 (nothing on the first £12,570, 20% on the next £37,430)
• Class 2 NI: £179 (flat rate, £3.45/week)
• Class 4 NI: £2,731 (6% on profits between £12,570 and £50,270)
• Total tax burden: roughly £10,400

Ltd director at £50k profit

• Salary of £12,570: no income tax, no employee NI (below the threshold)
• Employer NI on salary: £547 (company pays this, reducing the profit available for dividends)
• Corporation tax on remaining £36,883: £6,988 (19%)
• Dividends of £29,895: income tax of roughly £2,242 (8.75% after the £500 dividend allowance)
• Total tax burden: roughly £9,777

Gross tax saving: around £600–£700. But your accountancy fees have gone up by £500–£1,000. So at £50k profit, you might be looking at a net saving of a few hundred pounds. Meaningful? Arguably. Life-changing? No.

At £60k profit, the picture changes. The tax saving climbs to £2,000–£4,000 because more of your income falls into higher tax bands as a sole trader. That's where it starts to properly add up.

What changes day-to-day

The tax comparison gets all the attention, but the day-to-day differences are what actually affect how you work. Here's what shifts when you incorporate.

Separate bank account

Mandatory. A limited company must have its own bank account. Company money is not your money. You can't dip into it for personal expenses or treat it as your own cash. Everything you take out needs to be either salary, dividends, or an expense repayment.

Invoicing

Your invoices come from the company, not from you personally. The company name, registered address, and company number need to appear on every invoice. If you're VAT-registered, the company's VAT number goes on as well.

Payroll

Even if you're the only person in the company, you need to run payroll. That means registering as an employer with HMRC, filing Real Time Information (RTI) reports every time you pay yourself, and handling PAYE. Most tradesmen pay their accountant to manage this, but it's another cost and another thing to stay on top of.

VAT

Going limited doesn't change your VAT obligations directly. You still need to register for VAT once your turnover hits £90,000. But if your sole trader business was already VAT-registered, you'll need to register the new company separately. If you were using the Flat Rate Scheme, check whether it's still the best option under the Ltd structure.

IR35

If you're subcontracting for a single client and working on their site, under their direction, using their tools, IR35 might apply. This is HMRC's anti-avoidance legislation that says you're effectively an employee disguised as a company. If IR35 catches you, the tax advantages of operating through a limited company disappear entirely. Worth checking before you incorporate.

The liability question

This is the argument you'll hear most often from people pushing you towards Ltd. And it sounds good on paper. A limited company is a separate legal entity. If it fails, your personal assets are protected. Your house is safe.

In practice, it's more nuanced.

Banks require personal guarantees. If your company takes out a loan, leases a van, or rents a unit, the lender or landlord will almost certainly ask you to personally guarantee the obligation. At that point, limited liability doesn't help you.

HMRC can pursue directors personally for unpaid VAT and PAYE in certain circumstances, particularly if they can show you knew the company couldn't pay and kept trading anyway.

Public liability insurance covers the same ground for less hassle. Most domestic tradesmen are already carrying £1m–£5m in public liability cover. That protects you against claims from customers and third parties regardless of your business structure. For the risk most tradesmen face, insurance does the job without the complexity of incorporation.

Limited liability matters more if you're taking on large commercial contracts, employing staff, or carrying significant debt. For a sole trader doing domestic work with proper insurance, it's less of a factor than people make out.

When NOT to switch

Going limited is the right move for some tradesmen. But it's not the right move for everyone, and it's definitely not the right move at the wrong time.

If your profit is consistently under £40k, the tax savings won't cover the extra costs. You'll pay more in accountancy fees, spend more time on admin, and have little or nothing to show for it.

If you've just started out, stay sole trader. You don't know what your profit will look like yet. You might not even be self-employed this time next year. Get established first, get your numbers consistent, then reassess.

If you hate paperwork, be honest with yourself. A limited company means more of it. Payroll filings, annual accounts, corporation tax returns, confirmation statements, Companies House deadlines. If you're already behind on your Self Assessment, adding more obligations won't help.

If you're not sure you'll stay self-employed, don't incorporate. Winding down a limited company (striking off or voluntary liquidation) takes time and costs money. If there's a chance you'll go back to employment, a sole trader business is much easier to stop.