Published 2 August 2026 · updated 9 September 2026 · 6 min read
A sole trader is the business. A limited company is a separate legal person that you own. Almost every practical difference follows from that one distinction.
Liability
As a sole trader, the business's debts are your debts. If it fails owing money, creditors can pursue your personal assets. In a limited company, liability is limited to what is unpaid on your shares.
The limit is real, but it is not absolute. A director who signs a personal guarantee to a bank or a landlord is personally liable on that guarantee, and a director who trades on while knowingly insolvent can face personal consequences. Limited liability protects you from ordinary trading debts, not from promises you made yourself.
Tax
A sole trader pays income tax and National Insurance on profits, whether or not the money is taken out. A company pays corporation tax on its profits, and you are then taxed separately on what you take — as salary, as dividends, or as a loan.
That separation is what makes incorporation efficient at some profit levels and pointless at others. It depends on your numbers, your other income and the current rates. Anyone who gives you a single threshold as a rule of thumb is guessing.
Paperwork
Being a sole trader means a self assessment return. A company means annual accounts to Companies House and HMRC, a corporation tax return, a confirmation statement every year, and filings whenever officers or shares change. It is more work, permanently, whether or not the company trades.
Privacy
A sole trader's home address is not published anywhere by default. A company director's address is — unless a service address is used. This surprises people, and it is the single most common regret we hear about a formation done cheaply.
Credibility and access
Some customers will only contract with limited companies. Some sectors expect it. It also gives you a company number, which makes credit checks, insurance and larger contracts easier. That is a real advantage and it has nothing to do with tax.
When incorporating usually makes sense
- Profits are consistently above the level where the tax difference outweighs the extra admin — ask an accountant to run your actual figures.
- You want liability separated from your personal assets.
- Customers or a sector expect a limited company.
- You intend to bring in a co-owner or investor, which needs shares to exist.
When it does not
If you are testing an idea, earning modestly, and would rather not file accounts every year, staying a sole trader is a perfectly reasonable answer. You can incorporate later — it is a new legal person, so contracts, bank accounts and registrations move across, but it is entirely doable.
Nothing here is advice about your situation
It is general information about how UK company registration works, written to be accurate at the time of publication. Rules and fees change. Where a decision matters — tax, structure, an insolvent company — take advice on your own facts.