Setting up a business in the UK: the first real decision
Every new UK business starts with the same question: should you trade as a sole trader or register a limited company? The answer shapes how much tax you pay, how much of your personal money is at risk, and how much paperwork you face each year. HMRC and Companies House both make registration straightforward, but the choice matters far beyond your first week of trading. This guide explains the practical differences so you can pick the structure that fits your plans and then register it properly.
Sole trader: simple, cheap and personal
As a sole trader you are the business. You keep all profits after tax, and you are personally responsible for any debts or claims made against the business. There is no separate legal entity, so there is no Companies House registration and no annual accounts to file. You simply tell HMRC you are self employed and start trading.
Key points for sole traders:
- Register for Self Assessment with HMRC once you start trading.
- File a Self Assessment tax return each year and pay Income Tax on your profits.
- Pay Class 2 and Class 4 National Insurance where they apply.
- Keep records of income and expenses for at least five years.
The main advantage is cost and speed. The main risk is unlimited liability. If the business fails or is sued, your personal assets can be used to settle the debts.
Limited company: a separate legal person
A private limited company is a separate legal entity. It can own assets, sign contracts, sue and be sued in its own name. Directors and shareholders usually have limited liability, which means your personal exposure is normally capped at any unpaid shares you hold.
Key points for limited companies:
- Register at Companies House, usually online, and choose a unique name.
- Appoint at least one director and issue at least one share.
- File annual accounts and a confirmation statement every year.
- Pay Corporation Tax on company profits through HMRC.
- Register for PAYE if you pay yourself or staff a salary.
A limited company often looks more credible to larger clients, and it can be more tax efficient once profits rise. In return, you take on extra admin, strict filing deadlines and public disclosure of some details on the Companies House register.
Tax and legal differences at a glance
- Tax base: sole traders pay Income Tax on profits; companies pay Corporation Tax.
- Liability: sole traders are personally liable; company directors normally are not.
- Admin: sole traders file one tax return; companies file accounts plus a confirmation statement.
- Money: sole traders take drawings; directors take salary and dividends.
- Privacy: company details appear on the public register; sole trader details stay more private.
What about a partnership?
If two or more people go into business together, a partnership is another option. Partners share profits and liabilities, and each partner is normally personally responsible for the whole firm’s debts. A limited liability partnership (LLP) offers a middle ground, with limited liability for its members but partnership style taxation. Partnerships must also register with HMRC, and an LLP must register at Companies House as well.
How to choose the right structure
If you are testing an idea, working alone and expecting modest profits, sole trader status is usually the easiest start. If you expect higher profits, want limited liability, need to raise investment or work with corporate clients, a limited company is often the better fit. Many owners begin as sole traders and incorporate once turnover and risk grow. Remember that you can register for VAT as either structure once turnover approaches the threshold, so the structure does not limit your growth.
Costs to expect
- Companies House online incorporation: around 50 pounds.
- Accountancy fees: higher for a limited company than for a sole trader.
- Business insurance: depends on your trade and whether you employ staff.
- Bank account: many business accounts are free for an introductory period.
Record keeping and deadlines
Good records make tax time painless and keep you compliant. Keep invoices, receipts, bank statements and contracts, ideally in digital form. Sole traders must file a Self Assessment return by 31 January following the end of the tax year. Limited companies must file accounts with Companies House, usually nine months after the year end, and pay Corporation Tax nine months and one day after the accounting period ends. Directors also file a confirmation statement at least once every 12 months.
Registering your choice
Register as a sole trader through your HMRC online account. Register a limited company online at Companies House, where most applications are approved within 24 hours. Whichever route you take, keep your contact details current so you never miss a deadline. Once you are trading, a local listing helps customers and partners find you, so add your business to the directory to build visibility from day one.
Common mistakes to avoid
- Mixing personal and business money in a single account.
- Missing the Self Assessment deadline and triggering automatic penalties.
- Trading under a name that clashes with an existing company or trade mark.
- Forgetting to register for VAT when turnover passes the threshold.
- Assuming limited liability covers negligence, fraud or unpaid taxes.
Next steps
Decide on your structure, register with HMRC or Companies House, open a suitable bank account and set up simple record keeping. If you want more customers to discover you, add your business to the directory and keep your profile updated as you grow.