If you’re searching for a comparison of sole trader tax vs limited company, you’re probably at a point where your income has grown and someone — maybe your bank, maybe a mate who incorporated last year — has suggested it’s time to think about your structure. That’s a reasonable trigger for the conversation.

The short version of our view: for most people earning below £40,000 in profit, staying sole trader is simpler and not meaningfully more expensive on tax. Above that level — particularly if you don’t need to draw all your profit as personal income — incorporation starts to look genuinely attractive. But the tax saving doesn’t arrive without strings attached, and those strings matter.

Here’s how we think through it with clients.

As a sole trader, you and your business are treated as one legal entity. Every pound of profit the business makes is your personal income — whether you’ve withdrawn it or not. That means you pay Income Tax and Class 4 National Insurance on profit regardless of what’s sitting in your business account at year-end.

For 2026/27, Class 4 NIC runs at 6% on profits between £12,570 and £50,270, and 2% on anything above that. On top of that, you’re paying Income Tax at 20% (basic rate), 40% (higher rate above £50,270), or 45% (additional rate above £125,140).

So on, say, £60,000 of profit as a sole trader, you’re looking at Income Tax plus Class 4 NIC pushing your combined effective rate on that top slice well above 40%. That’s before we consider the potential loss of your personal allowance above £100,000.

One further thing worth noting: Making Tax Digital for Income Tax began rolling out from April 2026, which means some sole traders are now required to file quarterly digital records with HMRC — an extra administrative commitment that’s worth factoring in when you weigh up the structures.

A limited company is a separate legal entity. It pays Corporation Tax on its profits — 19% on profits up to £50,000, rising to 25% on profits above £250,000, with marginal relief applying in the band between those figures. You, as a director, pay tax only on what you extract from the company, not on what it earns.

The most common extraction strategy is a small salary (typically set around the National Insurance threshold to minimise NIC while preserving your state pension entitlement) combined with dividends from the company’s retained profits.

Dividends are taxed at a lower rate than salary — but those rates have crept upward. From April 2026, the basic rate on dividends is 10.75% and the higher rate is 35.75%. The dividend allowance — the amount you can take tax-free — is now just £500.

The key structural advantage is this: profits left inside the company are taxed at the lower Corporation Tax rate rather than your personal Income Tax rate. If you don’t need all your profits immediately, the company structure lets you defer personal tax and extract income in future years when it might suit you better — or use those retained funds to make employer pension contributions, which are deductible against Corporation Tax.

In our experience, limited companies tend to become meaningfully more tax-efficient somewhere in the £40,000–£60,000 annual profit range — but only in specific circumstances. The key variable isn’t just the profit level; it’s how much of that profit you actually need to draw.

If you need every pound of profit as personal income to cover your living costs, the tax advantage of a limited company narrows considerably. The company pays Corporation Tax, then you pay dividend tax on what you extract — and at higher-rate dividend tax of 35.75%, the combined rate can approach what you’d have paid as a sole trader anyway.

The structure works best when you can leave some profit inside the company. That means it suits people who:

• Have a working spouse or partner who can take a salary or dividends from the company at a lower marginal rate
• Are planning ahead and happy to retain profits for future years or reinvestment
• Are making significant employer pension contributions (deductible from Corporation Tax)
• Have other personal income sources that would push sole trader profits into higher-rate tax

For a single contractor or freelancer who draws all their profit each year and earns between £40,000 and £60,000, the net tax saving after accountancy fees may be modest — sometimes a few hundred pounds, sometimes a little more. That doesn’t mean incorporation is wrong, but it does mean the decision shouldn’t be made on tax alone.

Limited companies carry a meaningfully higher administrative burden than sole trader businesses. That’s not a reason to avoid incorporation, but it’s a cost that should be reflected honestly in the decision.

As a limited company director, you’re required to:

• File annual accounts with Companies House (these become publicly available)
• File a Corporation Tax return with HMRC
• File a Confirmation Statement each year
• Run payroll for your salary (even a small one requires RTI submissions)
• Maintain accurate bookkeeping throughout the year, not just at year-end
• Keep your personal and business finances entirely separate

Your personal details — name, registered address, and service address — appear on the Companies House register and are publicly searchable. If that’s a consideration for you, it’s worth knowing upfront.

None of this is unmanageable with a good accountant, and the costs can be structured as a company expense. But the jump from a sole trader Self Assessment to a full limited company compliance package is real, and the accountancy fees to support it will be higher. If the tax saving is modest, that fee difference narrows the net benefit further.