If you are starting a business in the UK, or you are already trading and wondering whether you have the right structure, the limited company vs sole trader question is the first big decision you will face. It affects how much tax you pay, what happens if something goes wrong, how you take money out of the business, and what you can sell when you leave.
This guide is written for UK business owners. Directors of limited companies. Contractors working through their own Ltd. Sole traders and freelancers. People in partnerships. Anyone about to incorporate. We are ICAEW qualified accountants who work with businesses of every shape across the UK, from a freelance designer in a Bristol studio to a manufacturing Ltd in the Leeds city centre. This is the guide we wish every client read before they started.
The answer is not the same for everyone. A limited company will save you thousands in tax in some situations. In others, it adds cost and complexity for no benefit. This guide gives you the framework to decide.
What is a Sole Trader?
A sole trader is the simplest business structure in the UK. You are the business. There is no separate legal entity. You register with HMRC for Self Assessment, file an annual tax return, and pay Income Tax and National Insurance on your profits. Your business income is your personal income.
How sole traders are taxed
You pay tax on your total profits, your business income minus allowable expenses, at Income Tax rates. For 2025/26:
- Personal Allowance: £0 to £12,570, 0%
- Basic rate: £12,571 to £50,270, 20%
- Higher rate: £50,271 to £125,140, 40%
- Additional rate: above £125,140, 45%
You also pay Class 2 and Class 4 National Insurance. Class 2 is a flat £3.45 per week if your profits are over £6,845. Class 4 is 9% on profits between £12,570 and £50,270, and 2% above that.
That means your combined marginal rate as a sole trader in the basic rate band is 29% (20% Income Tax + 9% Class 4 NI). In the higher rate band, it is 42% (40% + 2%).
Reporting and filing
You file one tax return each year, the SA100 with a SA103 supplementary page. You report your income and expenses. HMRC calculates your tax and NI. You pay it by 31 January following the tax year end.
From April 2026, Making Tax Digital for Income Tax (MTD ITSA) becomes mandatory if your turnover exceeds £50,000. You will need compatible software like Xero, QuickBooks, FreeAgent, or Sage to submit quarterly updates to HMRC. From April 2027, the threshold drops to £30,000. From April 2028, it drops to £20,000. If you are a sole trader now, you will be on MTD ITSA within three years.
Personal liability
This is the critical downside. As a sole trader, you are personally liable for everything. If your business is sued, your personal assets, your house, your car, your savings, are at risk. If the business cannot pay its debts, you must pay them. There is no corporate veil.
Insurance can mitigate some of this. Professional indemnity insurance. Public liability insurance. But it cannot cover every risk, and it does not protect you from all claims.
What is a Limited Company?
A limited company is a separate legal entity. It is owned by shareholders (which can include you) and run by directors (which can also include you). The company files its own tax return, pays its own tax, and enters into its own contracts. You are an employee and shareholder of the company, not the business itself.
How limited companies are taxed
The company pays Corporation Tax on its profits. For 2025/26:
- Small profits rate: 19% on profits up to £50,000
- Main rate: 25% on profits above £250,000
- Marginal relief: applies between £50,000 and £250,000, giving an effective rate between 19% and 25%
You then extract money from the company as either salary or dividends. Salary is an expense of the company (reducing its Corporation Tax) but incurs Income Tax and NI on you, plus Employer's NI on the company. Dividends are paid from post-tax profits and taxed on you at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate). The dividend allowance for 2025/26 is £500.
The overall tax burden on a limited company is typically lower than a sole trader on the same level of profit, especially between roughly £40,000 and £100,000 of profit. We will show you the numbers shortly.
Reporting and filing
A limited company has more filing obligations than a sole trader. You must:
- File annual accounts and a Company Tax Return (CT600) with HMRC within 12 months of the year-end
- File confirmation statements with Companies House each year
- Run payroll if you pay yourself a salary (most directors do)
- File a P11D and P11D(b) if you provide benefits in kind
- Report dividends to HMRC on your personal Self Assessment return
- Maintain statutory registers and records
Most directors use accounting software like Xero, QuickBooks, FreeAgent, or Sage to manage this. Many also use a payroll software like BrightPay or Iris. The admin burden is higher than being a sole trader, but it is manageable with the right tools and a good accountant.
Limited liability
Your personal liability is limited to the value of your shares, typically £1 or £100. If the company cannot pay its debts, creditors cannot come after your personal assets (with some exceptions, like personal guarantees on loans). This is the primary reason many business owners incorporate.
Tax Comparison: Limited Company vs Sole Trader
Let us compare the total tax burden on the same level of profit under both structures. We will use 2025/26 rates throughout.
Example: £45,000 profit
Sarah runs a marketing consultancy from her home office in the Northern Quarter in Manchester. Her profit is £45,000 after expenses.
As a sole trader:
- Income Tax: £45,000 - £12,570 = £32,430 taxable. £32,430 × 20% = £6,486
- Class 4 NI: (£50,270 - £12,570) × 9% = £3,393. But only on £32,430 of that band: £32,430 × 9% = £2,919
- Class 2 NI: £3.45 × 52 weeks = £179
- Total tax and NI: £6,486 + £2,919 + £179 = £9,584
- Effective rate: 21.3%
As a limited company:
- Corporation Tax at 19%: £45,000 × 19% = £8,550
- Profit after tax: £36,450
- Take as dividends (after £500 allowance): £35,950 taxable at 8.75% = £3,146
- Total tax: £8,550 + £3,146 = £11,696
- Effective rate: 26.0%
At £45,000 profit, the sole trader pays £2,112 less in total tax. The limited company is not the winner here because the Corporation Tax rate (19%) plus dividend tax (8.75%) exceeds the sole trader's combined rate (29% at the margin) once you account for the personal allowance and NI thresholds.
Example: £80,000 profit
Tom runs a software development company from his office in the Jewellery Quarter in Birmingham. His profit is £80,000.
As a sole trader:
- Income Tax: £80,000 - £12,570 = £67,430 taxable. First £37,700 at 20% = £7,540. Remaining £29,730 at 40% = £11,892. Total: £19,432
- Class 4 NI: (£50,270 - £12,570) × 9% = £3,393. (£80,000 - £50,270) × 2% = £595. Total: £3,988
- Class 2 NI: £179
- Total tax and NI: £19,432 + £3,988 + £179 = £23,599
- Effective rate: 29.5%
As a limited company:
- Corporation Tax at 19% on first £50,000 = £9,500. Marginal relief on next £30,000: effective rate approximately 21.5% on that slice. Let us calculate precisely: total CT = £50,000 × 19% + £30,000 × 25% = £9,500 + £7,500 = £17,000. But marginal relief reduces this. The exact CT using the marginal relief formula: (£80,000 × 25%) - (1/200 × (£250,000 - £80,000) × £80,000/£80,000) = £20,000 - £850 = £19,150. Effective rate: 23.9%.
- Profit after tax: £80,000 - £19,150 = £60,850
- Take as dividends: £60,350 taxable at 8.75% (basic rate band) and 33.75% (higher rate). Basic rate band available after personal allowance: £50,270 - £12,570 = £37,700. First £37,700 dividends at 8.75% = £3,299. Remaining £22,650 at 33.75% = £7,644. Total dividend tax: £10,943
- Total tax: £19,150 + £10,943 = £30,093
- Effective rate: 37.6%
At £80,000 profit, the sole trader pays £6,494 less in total tax. The limited company structure becomes less efficient as profits rise into the higher rate tax band, because dividend tax at 33.75% plus Corporation Tax at an effective 23.9% gives a combined rate of over 50% on the marginal pound above the basic rate threshold.
Wait, this contradicts what many contractors and small business owners believe. Let us explain.
Why the limited company still wins in many cases
The examples above assume all profit is extracted as dividends. In practice, limited company directors typically take a small salary (up to the NI primary threshold of £12,570) and the rest as dividends. This saves Employer's NI and preserves the personal allowance.
Let us rerun Tom's example with a £12,570 salary.
Tom's limited company with salary:
- Company profit before salary: £80,000. Salary: £12,570. Employer's NI on salary: 13.8% on (£12,570 - £9,100) = £479. Total cost to company: £13,049
- Company profit after salary and NI: £80,000 - £13,049 = £66,951
- Corporation Tax: £66,951 × 19% = £12,721 (assuming marginal relief still applies, but let us keep it simple at 19% for this level)
- Profit after CT: £54,230
- Tom's personal tax: salary £12,570 (no tax, no NI). Dividends: £54,230. £500 allowance. Taxable: £53,730. Basic rate band remaining: £50,270 - £12,570 = £37,700. First £37,700 at 8.75% = £3,299. Remaining £16,030 at 33.75% = £5,410. Total dividend tax: £8,709
- Total tax: £12,721 (CT) + £479 (Employer's NI) + £8,709 (dividend tax) = £21,909
- Effective rate: 27.4%
Now the limited company saves £1,690 compared to the sole trader. The salary strategy makes a significant difference.
The real benefit of a limited company appears when you retain profits in the business rather than extracting them all. If Tom only needs £40,000 to live on and leaves £26,951 in the company, he defers the dividend tax on that amount entirely. The retained profits are only taxed at 19% (or 25% depending on the level) until he takes them out. This is the core of the tax planning opportunity.
Non-Tax Factors: Liability, Perception, and Flexibility
Tax is not everything. The limited company vs sole trader decision involves several non-tax factors that can be more important than the numbers.
Personal liability and risk
If your business carries significant risk of being sued, you are a construction contractor, a consultant giving advice that could lead to financial loss, a product manufacturer, limited liability is valuable. One claim could wipe out years of savings. A limited company protects your personal assets.
If you are a low-risk freelancer like a writer or a virtual assistant, the risk may be low enough that insurance alone is sufficient. But insurance has limits and exclusions. Limited liability does not.
Professional image and credibility
A limited company often looks more established to clients, suppliers, and lenders. Many larger corporate clients will only contract with limited companies. If you work in financial services, technology, or professional services, being a limited company can open doors.
Conversely, some clients prefer sole traders for small, personal engagements. There is no universal rule. Know your market.
Flexibility to add partners or investors
A limited company can issue shares to new shareholders. This makes it straightforward to bring in a business partner, offer equity to key employees, or raise investment. A sole trader cannot do this, you would need to incorporate first.
If you have ambitions to grow beyond a one-person business, incorporating early avoids the disruption of restructuring later.
Exit and sale
Selling a sole trader business is harder than selling a limited company. A sole trader business is essentially you, the buyer is buying your client relationships and goodwill, but there is no separate entity to transfer. A limited company can be sold by transferring its shares. The buyer gets the company, its contracts, its assets, and its trading history.
Business Asset Disposal Relief (BADR) applies to limited company shareholders who sell their shares. For 2025/26, the rate is 14% on the first £1 million of gains. From 6 April 2026, it rises to 18%. That is significantly lower than the main CGT rates of 18% or 24%. Sole traders selling their business also qualify for BADR, but the structure is simpler with a company.
Admin and Compliance Burden
This is where many business owners underestimate the cost of a limited company. The admin is real. It takes time. It costs money.
What a sole trader files
- One Self Assessment return per year
- Quarterly MTD updates from April 2026 (if turnover exceeds £50,000)
- No Companies House filings
- No payroll (unless you have employees)
- No dividend paperwork
What a limited company files
- Annual accounts (filed with both HMRC and Companies House)
- Company Tax Return (CT600)
- Confirmation statement
- Payroll reports (RTI submissions every month or quarter)
- P11D and P11D(b) if benefits are provided
- Dividend vouchers and board minutes
- Statutory registers (directors, shareholders, PSC register)
The cost of compliance for a limited company is typically £500 to £1,500 per year for an accountant's services, plus software costs. A sole trader's compliance is cheaper, perhaps £200 to £500 for a basic Self Assessment.
But do not let the admin cost alone drive your decision. If the tax saving from being a limited company is £5,000 per year, paying an accountant £1,000 is still a net gain of £4,000.
IR35 and Contractors
If you are a contractor working through your own limited company, IR35 is the dominant factor in your decision. IR35 is designed to catch contractors who are effectively employees but use a limited company to reduce tax.
Since April 2021, medium and large clients (not small companies) are responsible for determining your IR35 status and issuing a Status Determination Statement (SDS). If they determine you are inside IR35, the fee payer must deduct PAYE and NI from your invoices before paying your company. This largely eliminates the tax advantage of being a limited company.
If your contracts are inside IR35, you may be better off as a sole trader or working through an umbrella company. The limited company structure adds admin for no tax benefit.
If your contracts are outside IR35, you genuinely control how, when, and where you work, you can substitute someone else, and you are not part of the client's organisation, the limited company remains tax-efficient.
The limited company tax implications for contractors are specific. You should take advice on your particular contracts before deciding.
When to Stay as a Sole Trader
The sole trader structure is the right choice for many businesses. Here is when it makes sense.
Low profit levels
Below about £40,000 of profit, the sole trader structure is usually more tax-efficient. The combined Income Tax and NI rates are lower than the Corporation Tax plus dividend tax combination, especially when you factor in the personal allowance and the NI thresholds.
Low risk businesses
If you provide services where the risk of being sued is minimal, and you have adequate insurance, the limited liability protection of a company is less valuable.
Simple operations
If you work alone, have no employees, no significant assets, and no plans to take on investment, the sole trader structure keeps things simple. You can focus on your work instead of compliance.
Testing an idea
If you are starting a side hustle or testing a business idea, start as a sole trader. You can always incorporate later. The cost and complexity of a limited company are not justified for an unproven venture.
When to Incorporate
Here is when a limited company becomes the better choice.
Profits above £50,000
Once your profits exceed about £50,000, the limited company structure starts to pull ahead, provided you retain some profits in the business. The ability to defer dividend tax on retained profits is the key advantage.
High risk activities
Construction, manufacturing, professional advice, property development, any business where a mistake could lead to a significant claim. Limited liability is worth the extra admin.
You want to sell the business
If you plan to exit within 5 to 10 years, a limited company makes the sale cleaner and more valuable. The buyer purchases shares, not just goodwill. BADR gives you a 14% CGT rate (rising to 18% from April 2026) on the first £1 million of gains.
You need to reinvest profits
If your business requires significant capital investment, equipment, software, premises, retaining profits in a company at 19% or 25% tax is more efficient than taking them as personal income at 40% or 45% and reinvesting after tax.
You want to bring in partners or investors
A limited company makes it straightforward to issue shares. A sole trader cannot do this without incorporating first.
Switching from Sole Trader to Limited Company
If you are already trading as a sole trader and decide to incorporate, the process is straightforward but has tax implications.
The incorporation process
You register a new company with Companies House. This costs £12 online and takes a few hours. You then transfer your business assets, goodwill, and contracts to the new company. HMRC treats this as a disposal of your sole trader business, which could trigger Capital Gains Tax.
However, if you incorporate and transfer your business in exchange for shares in the new company, you can claim Incorporation Relief under TCGA 1992, s162. This defers the Capital Gains Tax until you sell the shares. It is a common relief and most accountants will handle it as part of the incorporation.
You also need to close your sole trader Self Assessment with HMRC and register the new company for Corporation Tax. Our incorporation page covers this in more detail.
VAT considerations
If you are VAT registered as a sole trader, you can transfer your VAT registration to the new company using form VAT68. This avoids having to re-register and re-issue invoices.
The VAT registration threshold for 2025/26 is £90,000 in taxable turnover over a rolling 12-month period. If your turnover is below this, you do not need to register, but you may choose to voluntarily register if it benefits your business.
Action Checklist
Use this checklist to make your decision. Tick off each item as you work through it.
- Calculate your projected profit for the next 12 months. Be realistic. Use the lower end of your estimate.
- Run the tax comparison using the examples in this guide. Factor in a salary of £12,570 for the limited company scenario.
- Assess your risk level. Could a mistake lead to a claim of £50,000 or more? If yes, limited liability is valuable.
- Consider your clients. Will they only contract with limited companies? Do you need the professional image?
- Think about growth. Do you plan to hire employees, bring in a partner, or raise investment within 3 years?
- Consider your exit. Do you want to sell the business eventually? A limited company is easier to sell.
- Factor in admin costs. Accountant fees, software, filing fees. Typically £500 to £1,500 more per year for a limited company.
- Review your contractor status. If you are a contractor, check whether your contracts are inside or outside IR35.
- Talk to an accountant. A 30-minute call can save you thousands. We offer this as part of our services.
- Make the decision. If the numbers clearly favour one structure, go with it. If they are close, lean towards the simpler option.
Common Questions
Here are answers to the questions we hear most often from business owners making this decision.
Can I be both a sole trader and a limited company director?
Yes. You can have a limited company and also trade as a sole trader in a separate business. Each is taxed independently. This is common for people who have a main business as a limited company and a side project as a sole trader.
What happens to my existing contracts if I incorporate?
You need to novate your contracts, transfer them from you personally to the company. Most clients will agree to this, but you should check your contracts for any restrictions. Some clients may need to approve the change.
Do I need a business bank account as a sole trader?
No. You can use your personal bank account. However, a separate business account makes bookkeeping much easier and looks more professional. Most sole traders open a separate account once their turnover exceeds £10,000 to £15,000.
How much does it cost to run a limited company?
Companies House fees are £12 to register and £13 per year for the confirmation statement. Accountant fees typically range from £500 to £1,500 per year. Software costs £10 to £50 per month. Total: roughly £750 to £2,500 per year.
What is the best accounting software for a limited company?
Xero, QuickBooks, and FreeAgent are the most popular. FreeAgent is included with some bank accounts (like Mettle and NatWest). Sage is also widely used, especially in manufacturing and construction. Your choice should depend on your accountant's recommendation, most accountants specialise in one or two platforms.
Can I switch back from limited company to sole trader?
Yes, but it is more difficult than incorporating. You would need to close the company (strike it off or enter Members' Voluntary Liquidation), distribute the remaining assets to yourself, and pay any Capital Gains Tax on the distribution. This is usually only worthwhile if the company is no longer profitable.
Final Thoughts
The limited company vs sole trader decision is not permanent. Many successful business owners start as sole traders and incorporate when the numbers justify it. Others stay as sole traders for their entire career and do perfectly well.
The right answer depends on your profit level, your risk exposure, your growth plans, and your personal circumstances. Use the framework in this guide to work through it. Run the numbers. Talk to an accountant who understands your sector.
If you would like to discuss your specific situation, contact our team. We are ICAEW qualified accountants who work with UK businesses of every shape, from sole traders in the Baltic Triangle in Liverpool to limited companies in Canary Wharf in London. A 30-minute conversation is usually enough to give you a clear answer.
For more detail on the specific tax rules, see our fundamentals page and our guides on sole trader and self-employment and limited company tax.