Starting a business in the UK
One business idea. Two very different ways to run it.
Should you start as a sole trader or form a limited company? The right answer is not simply “which one pays less tax”. It depends on risk, how much money you need personally, growth plans, clients, administration and what you want the business to become.
Before you decide
Four questions matter more than a headline tax saving.
Side-by-side comparison
Sole trader vs limited company in plain English.
| Question | Sole trader | Limited company |
|---|---|---|
| Who is the business? | You are the business. | The company is legally separate from you. |
| Who owns it? | You own the business personally. | Shareholders own shares in the company. |
| Who runs it? | You run it. | Directors manage the company. |
| How is profit taxed? | Business profit forms part of your personal taxable income. | The company pays Corporation Tax. You may then pay personal tax on salary, dividends or other extraction. |
| Can profit stay in the business? | The profit is still your personal taxable business profit even if cash stays in the business bank account. | Post-tax company profit can remain in the company rather than being paid immediately to the shareholder. |
| Business debts | You are personally responsible for the business debts. | The company is normally responsible for its debts, subject to the legal rules and any personal guarantees. |
| Accounts and filings | Generally simpler, with Self Assessment and MTD where applicable. | Annual company accounts, Corporation Tax, Companies House obligations, and payroll where salary is paid. |
| Public information | No Companies House company accounts. | Company information and required filings appear on the public register. |
| Taking money out | You can draw business cash personally. Drawings do not change taxable profit. | Company money must be taken out in the correct form, such as salary, dividend, expense repayment or loan repayment. |
| Bringing in owners | Not designed around shares. | Shares can be used to define company ownership, subject to company law and tax rules. |
2026 to 2027 interactive illustration
Compare the same pre-owner-remuneration business profit.
This calculator deliberately uses one transparent limited-company scenario so you can see why there is no universal “go limited at £X” answer.
Sole trader vs one-director company
Rates used
Current 2026/27 figures used in this comparison include:
| Personal Allowance | £12,570 |
| Self-employed Class 4 NIC | 6% / 2% |
| Employer NIC rate | 15% above £5,000 |
| Corporation Tax | 19% / Marginal Relief / 25% |
| Dividend allowance | £500 |
| Dividend rates | 10.75% / 35.75% / 39.35% |
Do not choose your structure from this calculator alone.
It does not model pensions, retained profits, spouses or other shareholders, associated companies, other personal income, student loans, losses, benefits, IR35 or accountancy costs.
When each structure can make sense
No fixed profit threshold replaces a proper decision.
The tax result matters, but so do commercial risk, cash requirements, growth and administration.
Staying self-employed may make sense when
- You are starting small or testing the market.
- You want the simplest administration.
- You need to take most of the business cash personally.
- The business has relatively low commercial risk.
- You do not need shares or outside investors.
- The extra company administration would outweigh the practical benefit.
A limited company deserves a closer look when
- Legal separation and limited liability are commercially important.
- You can retain some profits rather than extract everything personally.
- You want to bring in shareholders or investment.
- The business is growing and needs a more formal structure.
- Major customers prefer or require a company.
- You want to build a business that can continue separately from you.
SV&Co position: incorporation should solve a real problem.
We would rather tell a client to remain a sole trader when that is the better fit than create a company purely because somebody quoted an outdated “tax-saving threshold”.
Business Structure Checker
Which structure deserves a closer look?
Answer six practical questions. This is not personalised tax advice. It is designed to show which issues should drive the discussion.
Sole trader vs Ltd FAQs
Questions new business owners regularly ask.
At what profit should I become a limited company?
There is no fixed profit threshold that works for everyone. Current tax rates, how much money you extract, other personal income, whether profits can stay in the business, liability, administration and future plans all affect the answer.
Is a limited company always more tax efficient?
No. A company first pays Corporation Tax and the owner can then face tax when money is extracted. With current dividend and employer National Insurance rates, the answer depends heavily on the circumstances.
Can I start as a sole trader and become a company later?
Yes. Many businesses start as sole traders and incorporate later. The change should be planned because assets, contracts, VAT, payroll, goodwill and tax can all need consideration.
Can I claim the same expenses in both structures?
Many genuine business costs can be relevant under both structures, but the legal and tax mechanism is not always the same. Sole-trader simplified expenses, company reimbursements, benefits and director transactions follow different rules.
Does a limited company protect all of my personal assets?
A company provides legal separation and shareholder liability is generally limited, but protection is not absolute. Personal guarantees, wrongful conduct and other circumstances can still create personal exposure.
Does MTD make a limited company better?
No. MTD is a compliance factor, not a reason on its own to incorporate. A company has its own separate compliance requirements.
Reviewed by
Sandip Vadher, PhD FCCA
Founder of SV&Co Accountancy. Fellow Chartered Certified Accountant with more than 20 years of finance and accountancy experience.
Business Structure Review
Do not form a company just because somebody told you it saves tax.
We can compare the structure against your expected profit, personal cash needs, business risk and growth plans, then explain the practical difference before you decide.