Sole Trader vs Limited Company for Tradespeople

Quick Answer: A sole trader and a limited company are the two main ways UK tradespeople trade. Sole trader is simpler and cheaper to run but offers no separation between you and the business — your personal assets are exposed and you pay Income Tax and Class 4 National Insurance on all profit. A limited company is a separate legal entity giving limited liability and, above roughly £30,000–£40,000 of annual profit, usually a lower total tax bill — at the cost of more admin, Corporation Tax, annual accounts and Companies House filings. The crossover point is about profit level, liability exposure and how much you value the protection and credibility.

Summary

Almost every tradesperson starts as a sole trader because it is the path of least resistance — you register with HMRC for Self Assessment and you are trading. For a lot of trades that is the right answer and stays the right answer. But as turnover and profit grow, two questions start to matter: am I paying more tax than I need to, and what happens to my house if a job goes badly wrong? Those are the two questions that drive the switch to a limited company.

The tax difference is real but often overstated by people selling incorporation services. A sole trader pays Income Tax and Class 4 National Insurance on all business profit. A limited company pays Corporation Tax on its profit, and the director-owner then extracts money as a small salary plus dividends, which are taxed differently and more favourably. Below roughly £30,000–£40,000 of annual profit the saving is modest and can be eaten by the extra accountancy cost; above it, the gap widens and incorporation usually pays. The exact figures shift every tax year as thresholds and rates change — treat any specific number as something to confirm with an accountant for the current year.

Tax is only half the decision, though. The bigger structural difference is limited liability. A sole trader is the business — there is no legal wall between you and it, so business debts and claims can reach your personal assets. A limited company is a separate legal person; provided you have not given personal guarantees and have not traded wrongfully, your exposure is generally limited to what you put into the company. For a trade carrying real risk — structural work, electrical, anything where a mistake could cause serious property damage or injury — that protection is worth a great deal, although it never replaces proper insurance.

Key Facts

• Sole trader — you and the business are legally the same; register for Self Assessment with HMRC; you keep all profit and bear all liability personally.
• Limited company — a separate legal entity registered at Companies House; you are typically director and shareholder; the company's debts are its own (subject to guarantees and wrongful trading).
• Sole trader tax — Income Tax plus Class 4 National Insurance on profit, via annual Self Assessment; also Class 2 NI position depending on profit level.
• Limited company tax — Corporation Tax on company profit; the owner extracts a salary (often around the NI threshold) plus dividends, taxed at dividend rates with a small annual dividend allowance.
• Crossover point — incorporation typically starts to save tax somewhere around £30,000–£40,000 of annual profit, but this depends on how much you draw and changes each tax year.
• Limited liability — the headline advantage of a company; personal assets are generally protected, but not if you sign personal guarantees, act fraudulently, or trade while insolvent.
• Admin burden — a company must file annual accounts and a confirmation statement at Companies House, file a Corporation Tax return, run any payroll through PAYE, and the director still files personal Self Assessment.
• Public record — company accounts (in abbreviated form for small companies) and director details are publicly visible at Companies House; sole trader finances are private.
• VAT — applies the same way to both: registration is required once VATable turnover passes the threshold (£90,000 —).
• CIS — the Construction Industry Scheme applies to both sole traders and companies working as subcontractors; deductions and gross payment status work slightly differently for each.
• Switching is one-way in practice — moving from sole trader to limited is common; unwinding a company back to sole trader is possible but messier.

Quick Reference Table

Detailed Guidance

How the tax actually differs

As a sole trader, the business profit is your income. After your personal allowance, you pay Income Tax at the relevant bands and Class 4 National Insurance on the profit. It is simple: one Self Assessment return, one tax bill (usually with payments on account).

As a limited company owner, there are two layers. The company pays Corporation Tax on its profit. You then take money out — typically a modest salary set around the National Insurance threshold (so the company gets the cost as a deduction without triggering much NI), and the rest as dividends. Dividends have their own tax rates and a small tax-free dividend allowance, and crucially they are not subject to National Insurance. That NI saving on the dividend portion is the main reason incorporation saves tax at higher profits.

The catch: extra accountancy fees, the discipline of running payroll and dividend paperwork, and the fact that the thresholds and rates change every tax year. Any "you'll save £X" figure is only true for one tax year and one drawing pattern — get it modelled by an accountant for your actual numbers.

Liability — the part that is not about tax

This is where the structures genuinely diverge. A sole trader has no legal separation from the business. If the business owes money it cannot pay, or a claim succeeds against it, the claimant can pursue your personal assets — including, ultimately, your home.

A limited company is a separate legal person. Its debts and liabilities are its own. As director and shareholder your exposure is generally limited to the share capital and anything you have lent in. But that wall has gaps:

• Personal guarantees — finance companies, some suppliers and some landlords will ask a director to personally guarantee the company's obligations. A signed guarantee bypasses limited liability entirely for that debt.
• Wrongful or fraudulent trading — continuing to trade and rack up debt when you knew the company was insolvent can make a director personally liable.
• Director's duties — directors have statutory duties; serious breaches carry personal consequences.

And limited liability is not a substitute for insurance. Public liability, employer's liability and (for design/advice trades) professional indemnity cover are essential whichever structure you use — see public liability insurance guide and insurance. The company structure protects your personal assets from the company's debts; insurance pays the claim in the first place.

Admin and the real cost of a company

A limited company is more work. Every year it must file accounts and a confirmation statement at Companies House, file a Corporation Tax return with HMRC, and — if you take a salary — operate PAYE. You, personally, still file Self Assessment. Company money is not your money; drawing it incorrectly creates a director's loan with its own tax consequences. Most trade company owners use an accountant for all of this, and the fee is a genuine running cost that has to be set against the tax saving. At lower profit levels the accountant can cost more than the company saves.

Credibility and commercial work

For domestic work, customers rarely care whether you are a sole trader or a company. For commercial and main-contractor work it can matter — some main contractors prefer or require subcontractors to be limited companies, partly for their own risk management and partly because it signals a more established operation. If your growth plan is towards commercial sites, that pushes towards incorporation. If you are a domestic jobbing trade, it is largely neutral.

When to switch

There is no single trigger, but the common pattern is: a tradesperson runs as a sole trader, profit climbs past the mid-£30,000s, an accountant runs the numbers and shows a worthwhile annual saving, and at the same time the work has grown more substantial so the liability protection has become valuable too. That combination — tax saving and meaningful risk — is the natural point to incorporate. Switching for tax alone, at low profit, often is not worth the admin. See limited company for the incorporation steps.

Frequently Asked Questions

At what profit should I become a limited company?

There is no fixed figure because the thresholds and rates change every tax year, but the tax saving from incorporation typically starts to become worthwhile somewhere around £30,000–£40,000 of annual profit — and it grows from there. Below that range the saving is often eaten by the extra accountancy cost and admin. The honest answer: get an accountant to model your actual numbers for the current tax year, and factor in liability protection and commercial credibility as well as the pure tax figure.

Does a limited company really protect my house?

Mostly, but not absolutely. A limited company is a separate legal entity, so its debts and claims are generally its own and your personal assets are protected. The protection fails where you have signed a personal guarantee (common for finance and some supplier accounts), where you have traded while insolvent, or where there has been fraud. And limited liability never replaces insurance — it protects you from the company's debts, but you still need public liability and employer's liability cover to actually pay claims. Treat the company as one layer of protection, not the whole shield.

Is it more expensive to run a limited company?

Yes — there is a real, ongoing cost. A company files accounts and a confirmation statement at Companies House, files a Corporation Tax return, usually runs PAYE for the director's salary, and the director still files personal Self Assessment. Most trade company owners pay an accountant to handle this, and that fee is a genuine running expense. The question is whether the tax saving comfortably exceeds that cost — which is exactly why low-profit sole traders often should not rush to incorporate.

Can I switch back to sole trader if it doesn't work out?

It is possible but messier than going the other way. You would stop trading through the company, transfer or wind it down properly (including dealing with its assets, debts and any tax on extracting remaining funds), and resume as a sole trader. Closing a company cleanly has its own process and cost. In practice the move is almost always one-way — sole trader to limited — so make the decision deliberately rather than assuming you can casually reverse it.

Regulations & Standards

• Companies Act 2006 — governs the formation, administration and directors' duties of limited companies.

• Income Tax (Trading and Other Income) Act 2005 — taxation of sole trader trading profit.

• Corporation Tax Act 2009 / 2010 — taxation of company profits.

• HMRC Self Assessment — the system through which sole traders, and company directors, report personal income.

• Finance Acts (annual) — set the current rates, thresholds and allowances; these change every tax year.

• Construction Industry Scheme (CIS) — applies to both structures when working as a subcontractor.

• GOV.UK — Set up as a sole trader — registration and obligations

• GOV.UK — Set up a limited company — incorporation steps and duties

• GOV.UK — Running a limited company — directors' responsibilities and filing

• GOV.UK — Business tax — current rates and thresholds for the tax year

• limited company — incorporation steps, IR35 risk and when to switch, in detail

• self employment tax — Self Assessment, CIS deductions, Class 4 NI and allowable expenses

• public liability insurance guide — the insurance cover you need whichever structure you trade under

• cis construction industry scheme — how CIS deductions and gross payment status work for each structure