Choosing between sole trader vs limited company is one of the first decisions you will make when starting a business in the UK. It affects how much tax you pay, how much paperwork you face, how much personal risk you carry, and, if you are planning a family, what maternity support and childcare help you can access.

There is no universally better option. The right choice depends on your profit level, your personal circumstances and your plans for the future. This guide breaks down the decision using the 2026/27 tax position and covers the practical considerations that generic guides often miss, including maternity pay, childcare eligibility and pension planning.

The Basics: What Is the Difference?

A sole trader is the simplest business structure. You and the business are legally the same thing. You keep all the profits, but you are also personally liable for all debts. You pay Income Tax and National Insurance on your business profits through an annual Self Assessment tax return. For a full rundown, see our Self Employed Tax UK: A Complete Guide for 2026/27.

A limited company is a separate legal entity. The company earns the profit, pays Corporation Tax, and you extract money as a mixture of salary and dividends. Your personal liability is limited to what you have invested in the company. There is more administration, but it offers tax-planning flexibility that sole traders do not have. For a plain-English overview, read What Is a Limited Company? A Plain English Guide for UK Business Owners.

Sole Trader vs Limited Company: Tax Comparison 2026/27

Tax is usually the biggest factor in the sole trader vs limited company decision. For 2026/27, HMRC has frozen the personal allowance at £12,570 and the higher-rate threshold at £50,270 until April 2028 (HMRC, 2025). The main Corporation Tax rates are unchanged (gov.uk, 2025).

Sole trader tax: You pay Income Tax at 20% on profits between £12,570 and £50,270, 40% on profits between £50,271 and £125,140, and 45% above £125,140 (HMRC, 2025). You also pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% on profits above that (HMRC, 2025).

Limited company tax: The company pays Corporation Tax at 19% on profits up to £50,000, rising to 25% on profits above £250,000. Between £50,000 and £250,000, marginal relief applies, producing an effective marginal rate of 26.5% on profits in that band (gov.uk, 2025). You then pay yourself a small salary, typically £12,570 a year to use your personal allowance, and take the rest as dividends. Dividends are taxed at 8.75% (basic rate), 33.75% (higher rate) or 39.35% (additional rate) above the £500 dividend allowance (HMRC, 2025).

Employer National Insurance rose to 15% from April 2025 (HMRC employer rates 2025/26), but for most single-director companies the £10,500 Employment Allowance covers the employer NIC due on a £12,570 salary (gov.uk Employment Allowance).

What this means in practice (illustrative figures for a single director taking a £12,570 salary and the rest as dividends, with no other income):

• At £30,000 profit, a sole trader and a limited company director take home roughly the same amount.
• At £50,000 profit, the two structures are near parity.
• At £60,000 to £80,000 profit, a limited company director may keep slightly more if all profits are extracted, though the difference is usually small.
• Above £80,000 profit, a sole trader often keeps more if the director extracts all profits as dividends, because dividend tax rates catch up.
• The real limited-company advantage usually appears when you retain profits, make pension contributions through the company, or split income with a spouse or civil partner.

The crossover point: The old rule of thumb that a limited company wins above £50,000 no longer holds for 2026/27 if you take all the money out. For a single director extracting all profits as dividends, a limited company often produces little or no income-tax saving until profits are well into six figures. The real advantages usually come from retaining profits, making employer pension contributions, or splitting income with a spouse or civil partner. This is why maternity pay, childcare, pensions and liability often matter more than raw tax savings.

The Hidden Cost of a Limited Company

Tax savings do not tell the whole story. Running a limited company costs more in administration.

Accountant fees: Typically higher than for a sole trader because you need annual accounts, a Corporation Tax return, payroll and dividend paperwork. Most sole traders only need a Self Assessment return.

Companies House fees: There is a one-off charge to incorporate and an annual Confirmation Statement fee. Check the current rates at Companies House.

Bookkeeping software: Many directors use accounting software to keep records. Free and paid options are available.

Registered office address: You may pay for a commercial address if you do not want your home address on the public register.

The net additional cost of running a limited company versus being a sole trader is typically several hundred pounds a year, and often more once accountant fees are included. Any tax saving needs to exceed that before incorporating actually puts more money in your pocket.

What Women Need to Know: Maternity Pay

This is where the sole trader vs limited company decision has a particularly significant impact for women, and it is rarely covered in standard comparison guides.

As a sole trader, you cannot claim Statutory Maternity Pay (SMP). You must claim Maternity Allowance instead, which pays a flat weekly rate from day one. For 2025/26 the rate is £184.03 per week (gov.uk, 2025), and it is uprated each April. There is no initial period at 90% of your earnings, unlike SMP. See our Maternity Pay Self Employed: A Complete UK Guide for the full rules.

As a limited company director, you are an employee of your own company. This means you can qualify for Statutory Maternity Pay, which pays 90% of your average weekly earnings for the first six weeks, then the flat rate for the remaining 33 weeks (gov.uk, 2025). Your company pays your SMP and then reclaims it from HMRC.

The difference can be worth thousands of pounds, especially for higher earners. If your salary is £30,000 per year, the 90% SMP rate for the first six weeks alone is roughly £519 per week, compared with the flat Maternity Allowance rate.

Important: To qualify for SMP as a director, you must have been employed by your company for at least 26 continuous weeks before the 15th week before your due date, and your average weekly PAYE earnings must meet the Lower Earnings Limit. For 2025/26 this is £123 per week (HMRC, 2025); check the 2026/27 rate at gov.uk. If you are considering starting a family, planning the timing of your incorporation is essential. Switch too late and you will not meet the qualifying criteria.

Childcare and the Dividend Trap

If you have young children, the sole trader vs limited company structure also affects your eligibility for free childcare.

The Free Childcare for Working Parents scheme in England offers up to 30 hours of free childcare per week for children aged 9 months to 4 years. To qualify, each parent needs to earn at least the equivalent of 16 hours per week at the National Living Wage from employment or self-employment. The Low Pay Commission has recommended that the National Living Wage for workers aged 21 and over rises to £12.83 per hour from April 2026 (Low Pay Commission, 2025). If that recommendation is accepted, the qualifying threshold would be roughly £10,675 per year for 2026/27.

Here is the catch for limited company directors: only income from employment or self-employment counts. Dividends do not count. Many directors pay themselves a minimal salary to save on National Insurance, which means their employment income falls below the qualifying threshold.

The fix is straightforward. Set your PAYE salary to at least the qualifying threshold. Based on the Low Pay Commission recommendation, this would be roughly £10,675 for 2026/27, but check the confirmed rate at gov.uk. The extra employer’s National Insurance is modest and is deductible as a business expense. For many single-director companies, the Employment Allowance will cover it. That small adjustment can unlock childcare support worth thousands of pounds annually.

As a sole trader, your self-employment income automatically counts towards the childcare threshold, so this is not an issue.

Liability Protection: What Is at Risk

If your business runs into financial trouble or faces a legal claim, the business structure determines what is at risk.

Sole trader: You are personally liable for all business debts. If the business owes money, creditors can pursue your personal assets, including your home and savings.

Limited company: Your liability is limited to the money you have invested in the company (typically the nominal value of your shares). Your personal assets are protected, provided you have not given personal guarantees on loans or acted fraudulently.

For businesses with significant financial exposure, those that hold stock, take on debt, or work in sectors where legal claims are possible, limited liability is a meaningful protection. For low-risk service businesses or freelancers, the practical risk of personal liability as a sole trader is lower, though not zero.

Pensions and Long-Term Planning

Limited companies offer more tax-efficient pension options. The company can make employer pension contributions directly, which are deductible from Corporation Tax and do not attract National Insurance. A sole trader making pension contributions only gets basic-rate tax relief at source, with additional relief claimed through Self Assessment for higher-rate taxpayers. The mechanism is less flexible and, for higher earners, less generous.

For a director with £80,000 in profit, employer pension contributions through the company can save several thousand pounds in combined Corporation Tax and National Insurance compared with equivalent sole trader pension contributions. If you are thinking about long-term financial planning, this is one of the strongest arguments for a limited company at higher income levels.

Credibility and Perception

This is subjective but worth mentioning. Some clients, particularly larger businesses and corporate clients, prefer to work with limited companies. They may view it as a signal of professionalism and stability. Some will require it for insurance or procurement reasons.

For consumer-facing businesses or freelancers working with small clients, this is less of an issue. Most customers will never know or care whether you are a sole trader or a limited company.

The Quick Decision Guide

Stay as a sole trader if:

• Your annual profit is below £50,000 to £60,000
• You want minimal admin and paperwork
• You are just starting out and testing a business idea
• You do not need limited liability protection
• You do not have plans to raise investment

Set up a limited company if:

• Your annual profit is consistently above £100,000, or you plan to retain profits
• You want personal liability protection
• You are planning a family and want access to Statutory Maternity Pay
• You want to make tax-efficient pension contributions
• You plan to bring on investors or co-founders
• Clients expect or require it

Consider switching from sole trader to limited company when:

• Your profits consistently exceed £100,000, or you can use pension contributions or income splitting
• You are planning maternity leave within the next 12 to 18 months (allow time to meet the SMP qualifying criteria)
• You want to start building a pension through the company
• Your business carries increasing financial risk

You Can Always Switch Later

The most important thing to know is that this decision is not permanent. You can start as a sole trader today and incorporate as a limited company later when your income justifies it or your circumstances change. Many successful businesses start as sole traders and incorporate once the numbers make sense.

Starting simple and scaling up is almost always the right approach. Do not incorporate a limited company for a business idea that has not yet proven it can generate revenue. Get trading, prove the concept, and incorporate when the tax, maternity, childcare or liability benefits make it worthwhile.

Action steps: Calculate your expected profit for 2026/27, factor in the extra admin costs of a limited company, and check whether maternity pay, childcare support or pension planning tip the balance. The sole trader vs limited company choice is a financial and personal one; make it with this year’s numbers in front of you.