One of the most common questions we hear from professional services business owners is whether they should be operating as a sole trader or a limited company. The answer depends on your profit level, your appetite for admin and the type of clients you work with.
Neither structure is universally better. Each has trade-offs, and the right choice today may not be the right choice in two years. This post covers the practical differences so you can make an informed decision.
The basics
A sole trader is the simplest way to run a business. You register with HMRC, file a Self Assessment return each year and pay income tax and National Insurance on your profits. There is no legal separation between you and the business, which means you are personally liable for any debts.
A limited company is a separate legal entity. It pays corporation tax on its profits, and you as the director take money out through a combination of salary and dividends. The company files its own accounts with Companies House and a corporation tax return with HMRC. Your personal liability is generally limited to what you have invested in the company.
When does a limited company start to make more sense?
At modest profit levels (below around £30,000 to £35,000), the tax difference between the two structures is often small once you factor in the extra accountancy fees and admin costs of running a company. For many early-stage coaches, freelancers and small consultancies, staying as a sole trader keeps things simple and affordable.
As profits rise towards £50,000 and above, a limited company typically becomes more tax-efficient. By setting your salary around the National Insurance threshold and taking the rest as dividends, the combined corporation tax and dividend tax is usually lower than paying income tax and Class 4 National Insurance on the full amount as a sole trader.
At higher profit levels, the gap widens further. But it is worth noting that dividend tax rates increased from April 2026, so the advantage is smaller than it used to be. The numbers are worth running for your specific situation rather than relying on rules of thumb.
Beyond tax: other factors to consider
Liability
As a sole trader, your personal assets are on the line if the business runs into trouble. A limited company provides a layer of protection, though banks and landlords often ask for personal guarantees which reduces that benefit in practice.
Client perception
Many B2B clients, particularly larger corporates and public sector bodies, prefer to work with limited companies. If you are tendering for contracts or joining supplier frameworks, operating as a company can help. For smaller, direct clients, it is less likely to matter.
Admin and cost
A limited company means annual accounts, corporation tax returns, confirmation statements and payroll. Accountancy fees are higher, and there is more paperwork to manage. If you value simplicity and your profits are modest, this overhead may not be worth it.
IR35
If you operate through a limited company and work for clients in a way that could be considered employment, IR35 rules come into play. Where engagements fall inside IR35, the tax advantage of a company structure is significantly reduced because the client (or agency) must deduct PAYE and National Insurance at source. This is particularly relevant for consultants and contractors working with medium or large private sector clients.
Making the switch
If you decide to move from sole trader to limited company, the process involves registering a company with Companies House, setting up a company bank account, registering for corporation tax with HMRC and updating your contracts and invoices. If you are VAT-registered, you will need to transfer the registration to the new company.
The timing matters too. Moving mid-year can create split-period complications, so it is worth planning the transition with your accountant to keep things clean.
How ClearSum can help
We work with both sole traders and limited companies, so we can help you assess which structure suits your situation and manage the transition if and when the time is right. Our packages cover all the filings for a fixed monthly fee, whether you are a sole trader at £62.50+VAT per month or a limited company from £150+VAT per month.
If you would like to talk through the options, book a free discovery call and we can run the numbers for your business.
