Sole Trader vs Limited Company for Tradespeople

Quick Answer: Sole trader is the simplest structure — register for Self Assessment with HMRC and pay income tax plus National Insurance on all profits. A limited company pays corporation tax at 19–25% and allows tax-efficient profit extraction as dividends, but requires annual Companies House accounts and typically costs £1,200–£2,500 per year in accountant fees. The break-even point where incorporation produces meaningful savings is around £40,000 profit per year after accounting for those fees.

Summary

Choosing how to structure your business is one of the most consequential decisions a tradesperson makes — not because it is difficult to change, but because getting it wrong costs real money over time. Most tradespeople start as sole traders because it requires almost no formality: register with HMRC, keep records, file a Self Assessment return each year. That structure works well at lower profit levels. As earnings grow, the tax picture shifts, and a limited company becomes progressively more attractive.

The comparison is not simply about tax rates. A limited company offers limited liability — your personal assets are legally separate from the business — but comes with statutory obligations: annual accounts filed at Companies House, a Corporation Tax return (CT600), a Confirmation Statement, and often a directors' report. These require an accountant. The accountant costs money. The tax saving must exceed those costs to make incorporation worthwhile. For most tradespeople, that tipping point arrives somewhere between £35,000 and £50,000 of annual profit.

There is no universally correct answer. The right structure depends on your profit level, whether you employ others, your risk appetite, your growth plans, and whether commercial clients or lenders require a particular structure. This article sets out the factual framework so you can make the decision with your accountant — or verify that the advice you have been given is sound.

Key Facts

Quick Reference Table

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Factor Sole Trader Limited Company
Setup cost Free (registration with HMRC only) £12 Companies House online fee
Setup time Register with HMRC — done in minutes 24–48 hours incorporation
Tax on profits Income tax + NIC (up to 47% combined) Corporation tax 19–25%, then dividend tax on extraction
Annual filing Self Assessment once a year Accounts + CT600 + Confirmation Statement
Accountant cost £400–£900/year £1,200–£2,500/year
Personal liability Unlimited Limited to shares (with caveats for guarantees)
Business bank account Strongly recommended Legally required
Employing staff Possible — run PAYE Possible — director is also an employee
Employer pension contributions Not applicable (personal pension) Yes — deductible as a company expense
Closing the business Inform HMRC and cease trading Formal striking off or liquidation process
Commercial credibility Accepted for domestic work Often expected for larger commercial contracts

Detailed Guidance

How Sole Trader Tax Works

As a sole trader, HMRC treats you and your business as a single entity. You pay income tax on your trading profit (income minus allowable expenses) and National Insurance on top. For 2024/25, a sole trader with £50,000 profit would pay income tax of approximately £7,486 on the basic-rate portion plus National Insurance of approximately £3,380, totalling around £10,866 — leaving roughly £39,134 take-home.

Allowable expenses reduce taxable profit. Common deductions for tradespeople include: van running costs, tools, materials for your own business, insurance premiums, professional memberships (Gas Safe, NICEIC, etc.), training courses, phone costs, and a proportion of home working costs. Capital expenditure on plant and equipment — vans, tools, larger machines — qualifies for Annual Investment Allowance (AIA) up to £1 million per year, meaning you can deduct the full cost in the year of purchase rather than depreciating over time.

Payments on Account catch many new sole traders by surprise. From the second year of Self Assessment, HMRC requires advance payments (31 January and 31 July) towards the following year's estimated tax bill. Budget for this: keeping 25–30% of each payment into a separate tax account from day one avoids the shock of a large bill in January.

How Limited Company Tax Works

A limited company is a separate legal entity. It pays corporation tax on its profits. As director and shareholder — typically the same person in a small trade business — you pay tax on what you extract from the company, not on what the company earns.

The tax-efficient extraction method is as follows. The company pays you a director's salary at or below the NIC secondary threshold (approximately £9,100 per year). This avoids both employee and employer National Insurance. The salary is an allowable expense, reducing the company's taxable profit. The remaining post-tax profit is paid as dividends. Dividends are subject to dividend tax at rates lower than income tax, with no NIC.

For a company with £60,000 profit before salary: the director takes £9,100 salary (no NIC on this for either party), leaving £50,900 of company profit. After corporation tax at 19% (£9,671), £41,229 is available as dividends. The director pays dividend tax of approximately £3,600 on this. Combined company and personal tax: approximately £13,271 — versus approximately £18,400 as a sole trader on the same underlying profit. The saving is approximately £5,100 before adding the extra accountant cost.

The Net Saving After Accountant Costs

The tax comparison above overstates the true saving by ignoring the additional cost of running a company. A sole trader Self Assessment return costs roughly £400–£900 per year with an accountant. A limited company's full set of obligations — annual accounts, CT600, Confirmation Statement, payroll, and director's Self Assessment — runs approximately £1,200–£2,500 per year. The difference is roughly £800–£1,600 per year.

At £40,000 profit, the tax saving from incorporation is approximately £1,800. After the extra accountant cost, the net benefit is £200–£1,000 per year — not nothing, but not transformative. At £60,000 profit, the net saving is more compelling: £3,500–£4,300 per year. At £80,000 profit, the net saving typically reaches £6,000–£8,000 — clearly worthwhile.

Run these numbers with your own accountant using your actual figures before incorporating. An accountant who tells you to incorporate without showing you a worked example of the saving is not giving you useful advice.

Liability Differences

Sole trader unlimited liability is the factor most tradespeople underestimate. If a job goes wrong and a customer sues for more than your public liability insurance covers — or if a supplier pursues unpaid invoices — your personal assets including your home are at risk. A limited company creates a legal separation between you and the business.

In practice, the protection is partial. Banks almost always require personal guarantees on business lending to small companies. Some commercial clients ask for personal guarantees on large contracts. And if you trade while insolvent or act fraudulently, the courts can lift the corporate veil. But for most trades — where the primary financial risk is a PI or PL claim covered by insurance — incorporation does provide a meaningful additional layer of protection beyond what the policy covers.

Administration and Compliance Burden

The administrative difference is real and should not be minimised. A sole trader files one Self Assessment return per year and keeps records for HMRC — that is essentially it. A limited company has multiple annual obligations:

Annual accounts — prepared to Companies House standard (simplified for micro-entities under FRS 105), filed within 9 months of the financial year end; late filing results in automatic fines starting at £150.

Corporation Tax return (CT600) — filed with HMRC within 12 months of the accounting period end; tax paid within 9 months and 1 day of the year end.

Confirmation Statement — annual filing confirming officers, registered address, and shareholding; £34 online; failure to file is a criminal offence.

PAYE — if you pay yourself a salary (even the small NIC-efficient amount), the company must register as an employer and submit Real Time Information (RTI) returns to HMRC on or before each payroll run.

These obligations are why accountant costs are higher. A company producing modest profits will frequently cost more in extra accountant fees than the tax saving generates. Check the numbers before incorporating.

When to Consider Switching

Most tradespeople move from sole trader to limited company when profits consistently exceed £40,000–£50,000 per year. Other triggers that justify incorporation below that threshold include:

There is rarely a good reason to start as a limited company from day one if you are a new sole trader with modest or uncertain income. The administration overhead is not justified until the saving is real and sustained.

CIS and VAT: Same Rules for Both

The Construction Industry Scheme (CIS) applies to both sole traders and limited companies working as subcontractors in construction. A sole trader verifies under their National Insurance number and UTR. A limited company verifies under its company UTR. Gross payment status — where no CIS deduction is made — can be applied for by either structure; the turnover threshold is £30,000 annual net turnover for a sole trader and £30,000 per director for a company.

VAT registration is required when taxable turnover exceeds £90,000 in any rolling 12-month period. This threshold and the registration process are identical for both structures. The Flat Rate Scheme is available to businesses with taxable turnover below £150,000 and can be used by both sole traders and limited companies.

Frequently Asked Questions

Can I switch from sole trader to limited company mid-year?

Yes. You can incorporate at any time. When you do, the sole trader business ceases on that date and the limited company begins trading. You will need to complete a final Self Assessment return for the sole trader period and establish PAYE for the new company. Any business assets (van, tools, plant) need to be transferred to the company at an agreed value — your accountant manages this. Certification bodies (Gas Safe, NICEIC, etc.) typically require re-registration in the company name, which takes time to arrange.

Do I need to register for VAT when I incorporate?

No. VAT registration is based on turnover, not structure. If your turnover exceeds £90,000, you must register regardless of structure. If you are already VAT-registered as a sole trader, you will need to deregister that registration and register the new company separately — the numbers do not carry over automatically. See VAT registration for tradespeople for full guidance on the registration process.

Does my business structure affect CIS deductions?

CIS applies to both structures. The main practical difference is that a limited company sets CIS deductions against its PAYE liability each month, whereas a sole trader claims them back on Self Assessment. This can create a timing difference — a limited company with significant CIS deductions and a small payroll may need to reclaim from HMRC during the year. See the CIS guide for detail on how offsets work.

Will I need to pay myself differently as a director?

Yes. As a director you are an employee of the company and must be on the payroll. Even a small salary requires the company to be registered as an employer and to file RTI submissions to HMRC each month or each time you are paid. You cannot simply transfer money from the company account to your personal account — it must be categorised as salary, dividend, or director's loan. Director's loans above £10,000 create benefit-in-kind tax implications, so keep the categorisation clear.

What are the main risks of staying as a sole trader at higher earnings?

At higher profit levels the tax cost is significant: a sole trader on £70,000 profit pays approximately £26,000 in income tax and NIC — the highest-earning band of income is taxed at effectively 49% when Class 4 NIC is included. Beyond tax, unlimited personal liability remains a risk if a claim exceeds your insurance. Some commercial clients will not engage sole traders for larger contracts. None of these are reasons to rush incorporation — but they are the considerations that make the decision worth taking seriously.

Regulations & Standards