Sole Trader vs Limited Company in the UK: Which Should You Choose?

Podcast Transcript

Most new business owners get stuck on one crucial decision that could save or cost them thousands each year. Do you register as a sole trader or set up a limited company?

Welcome to the Built For Small Business podcast.

This choice trips up so many entrepreneurs because there genuinely isn't a one-size-fits-all answer. It depends on your income level, your industry, your risk appetite, and what you're planning to build. But there is usually a right answer for you specifically, and today we're going to help you find it.

We'll cover what each structure actually means, how the tax works in 2025/26, the practical differences in day-to-day running, and the specific situations where one makes more sense than the other.

Let's start with the basics. What is a sole trader?

A sole trader is the simplest way to run a business in the UK. You and your business are the same legal entity. You register with HMRC as self-employed, file a Self Assessment tax return each year, and pay Income Tax and National Insurance on your profits.

There's no registration fee, no Companies House filing, and no complicated structure to maintain. You can start trading almost immediately after notifying HMRC. If your self-employment income is under £1,000 per year, you don't even need to register at all.

The simplicity comes with a trade-off though: unlimited personal liability. If your business runs into debt or a client takes legal action against you, your personal assets are at risk. Your home, your savings, your car. You and the business are the same thing in the eyes of the law, which means there's no protective barrier between your personal finances and your business obligations.

Now, what about a limited company?

A limited company is a separate legal entity from you. The company has its own identity, its own bank account, its own assets and liabilities, and its own tax obligations. You're a director of the company, and typically its sole shareholder, but the company exists independently of you.

This separation is the fundamental advantage of limited company status. If the company runs into debt or faces legal action, creditors can pursue the company's assets, but generally cannot touch your personal assets. Your liability is limited to the amount you've invested in the company.

Setting up a limited company involves registering with Companies House, which costs £12 online and takes less than 24 hours. Ongoing obligations include filing annual accounts, a corporation tax return, a confirmation statement, and if you pay yourself a salary, running a PAYE payroll scheme.

Here's what matters most: the tax differences.

Tax is usually the deciding factor when people make this choice, so let's break down the numbers properly.

As a sole trader, your profits are treated as your personal income. In 2025/26, you pay Income Tax at 20% on profits between £12,571 and £50,270. That's the basic rate. Then 40% on profits between £50,271 and £125,140, and 45% on profits above £125,140.

You'll also pay Class 4 National Insurance at 6% on profits between £12,570 and £50,270, and 2% above £50,270. Your first £12,570 is tax-free thanks to the Personal Allowance.

Let me give you an example. A sole trader with £40,000 profit in 2025/26 would pay approximately £5,486 in Income Tax and £1,642 in Class 4 National Insurance. That's a total tax bill of around £7,128, leaving a take-home of roughly £32,872.

Now, what happens if that same business was structured as a limited company?

A limited company pays Corporation Tax on its profits at 19% for profits up to £50,000, or up to 25% for profits over £250,000. The company pays this tax, not you personally.

As a director, you typically pay yourself in two ways. First, a salary, usually set at or around the National Insurance threshold of £12,570 in 2025/26. This minimises National Insurance while still counting as employment for State Pension purposes.

Second, dividends, paid from post-Corporation Tax profits. Dividends are taxed at 8.75% for basic rate taxpayers, 33.75% for higher rate, or 39.35% for additional rate. Crucially, they don't attract National Insurance.

The combination of a low salary and dividends can be more tax-efficient than paying the same income as a sole trader. But the gap has narrowed significantly in recent years as dividend tax rates have increased and the dividend allowance has fallen to just £500 per year.

Going back to our example, a limited company with £40,000 profit, with the director taking a £12,570 salary and the remainder as dividends, would typically see a lower overall tax bill than the sole trader equivalent. But only after accounting for accountancy fees of £500 to £1,500 per year that come with running a limited company properly.

So when does incorporating actually save you money?

The breakeven point where a limited company edges out on tax efficiency generally sits around £40,000 to £50,000 in annual profits, depending on your extraction strategy. Below this level, the tax savings from incorporating often don't outweigh the additional accountancy fees and administrative burden.

In recent years, corporation tax, dividend income tax, and employer's National Insurance contributions have all risen. This means that for many business owners, the tax advantage of a limited company is now smaller than it used to be. This isn't a reason to avoid incorporating, but it is a reason not to assume incorporating will automatically save you money without running the numbers for your specific situation.

Let's talk about the practical differences beyond tax.

The day-to-day reality of running each structure is quite different.

As a sole trader, your obligations are minimal. You keep records of your income and expenses, file a Self Assessment tax return each year by 31st January, and register for VAT if your turnover exceeds £90,000. Many sole traders manage this themselves without an accountant.

As a limited company director, your obligations are more involved. You must prepare annual accounts for both Companies House and HMRC, file a Corporation Tax return, submit a confirmation statement to Companies House every year, and run a PAYE payroll if you pay yourself a salary. Most limited company directors use an accountant to manage this, typically costing between £500 and £1,500 per year.

Here's something many people don't consider: privacy.

As a sole trader, your financial information stays private. Nothing is published publicly about your income, assets, or business dealings. As a limited company director, your company data, including basic financial information, is visible on Companies House and accessible to anyone. Your name, registered address, and filed accounts are all public record.

For many people, this isn't a concern, but it's worth being aware of.

Now, what about personal liability? This is where the structures differ most fundamentally.

As a sole trader, there's no legal separation between you and your business. If a customer sues you or a supplier chases you for unpaid invoices, they can go after your house, your car, and your savings.

As a limited company, your personal assets are protected. Creditors can only pursue the company's assets, not yours. There are exceptions like fraud, personal guarantees, and wrongful trading, but the general principle of separation is the fundamental benefit of incorporating.

If your business involves meaningful financial risk, large contracts, physical products, employees, or client liability, this protection matters significantly.

Let's also consider business name protection and credibility.

As a sole trader, your business name isn't legally protected. Anyone can trade under the same name as you, which can cause confusion and reputational problems if your business grows.

As a limited company, your registered company name is protected. No other company can register the same name with Companies House, which gives you a degree of brand protection that sole traders don't have.

Some customers and suppliers see sole traders as less established compared to limited companies, which could impact your ability to attract certain types of business. This matters more in some industries than others. Contractors and consultants working with large corporates and businesses in professional services often find that limited company status opens doors that are harder to open as a sole trader.

A limited company structure also makes it easier to attract funding and investment, since it allows you to issue shares or bring in partners. If you're planning to raise external investment at any point, a limited company is effectively a prerequisite.

So which structure is right for you?

There's no single right answer, but here are the situations where each structure typically makes the most sense.

Start as a sole trader if you're in the early stages and testing whether the business will work. If your annual profits are currently below £25,000 to £30,000. If you offer low-risk services with no significant client liability. If you want minimal admin and to keep full control of every decision. If you're running a side hustle alongside employment. Or if privacy is important to you.

Consider a limited company if your annual profits are consistently above £40,000 to £50,000, and you want to explore tax efficiency. If your work involves meaningful financial risk or significant client liability. If you're working in contracting, consulting, IT, or professional services where clients prefer or require company status. If you're planning to bring in investment, take on business partners, or issue shares. If you want to protect your personal assets and separate your personal finances from your business. Or if you're building something with long-term growth plans that may require formal funding.

The most common path is to start as a sole trader, keep things simple while the business finds its feet, and then incorporate once profits and risk levels justify the extra complexity. Many of today's successful UK limited companies started life as sole trader operations.

Whether you're a sole trader or a limited company director, the fundamentals of good financial management are the same. Keep clean records of your income and expenses, invoice clients professionally, and know what your business owes before HMRC asks.

You can find a comprehensive breakdown of all the tax calculations, frequently asked questions, and practical examples in the full guide linked in the description.

Thanks for listening. You can find more guides and tools at builtforsmallbusiness.com.