Key facts (2026): You can start a business in the UK as a sole trader (simplest — just notify HMRC), a limited company (register at Companies House for £12–£50), or a partnership. A sole trader earning under £1,000/year needs no registration. Above £1,000, you must register for Self Assessment. A limited company becomes financially advantageous typically above £30,000–£50,000 profit.
Starting a business in the UK is administratively straightforward — the barriers are lower than in most comparable economies. The key decisions are structure (sole trader vs limited company), tax registration, and understanding your ongoing obligations. Getting these right from the start avoids costly corrections later.
Choosing Your Business Structure
Sole trader: simplest structure. No registration required beyond HMRC notification. You are personally liable for all business debts. Pay income tax and NI on profits via Self Assessment. Limited company: registered at Companies House. Separate legal entity — your personal assets are protected from business debts. Pay corporation tax (25% for profits over £250,000; 19% for profits under £50,000; marginal relief in between). More administrative work but often more tax-efficient above £30,000–£50,000 profit. Partnership: two or more people sharing business and profits. Each partner pays income tax on their share.
Registering Your Business
Sole trader: register for Self Assessment at gov.uk/register-for-self-assessment — do this by 5 October in your second year of trading. Limited company: register at Companies House (companieshouse.gov.uk) — costs £12 online, £40 by post. You also need to register for Corporation Tax within 3 months of starting to trade. VAT registration: mandatory when taxable turnover exceeds £90,000 in a 12-month period. You can voluntarily register below this threshold — useful if your customers are VAT-registered businesses who can reclaim the VAT.
Tax Obligations for New Businesses
Sole trader: Self Assessment due 31 January, covering the previous tax year. Pay income tax (20–45%) and Class 4 NI (6% on profits £12,570–£50,270) on trading profits. Payments on account required when tax bill exceeds £1,000. Limited company: Corporation Tax return (CT600) due 12 months after accounting period ends. Tax due 9 months and 1 day after period end. Payroll (PAYE) if you take a salary. Dividend payments — taxed at dividend rates in the owner's hands.
Our Verdict
Starting as a sole trader is the right call for most people testing a business idea — zero setup cost, minimal administration, and easy to switch to a limited company later when it makes financial sense. The limited company route makes sense earlier if you need the liability protection (dealing with contracts, intellectual property, or higher-risk activities) or if you anticipate profits above £30,000–£50,000 fairly quickly. Get an accountant's view on structure before committing if turnover is expected to be significant — the tax saving over a year typically exceeds the advisory fee.
Frequently Asked Questions
How do I start a business in the UK?
Choose your structure (sole trader is simplest), notify HMRC, open a business bank account, and keep records from day one. Limited companies register at Companies House.
Do I need to register my business UK?
Sole traders: register with HMRC for Self Assessment if earning over £1,000/year. Limited companies: register at Companies House (£12 online).
When should I become a limited company?
Typically when annual profits reach £30,000–£50,000 — the tax efficiency of limited company structure (corporation tax + dividends) generally outweighs the additional admin at this level.
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Disclaimer: For informational purposes only. Verify with official sources before making decisions.
Last updated: April 2026 · Author: Chandraketu Tripathi
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