Starting your own business is an exciting step, but it is important to understand the legal process of setting up a business UK entrepreneurs must follow. Getting the formalities right from the outset helps you avoid fines, tax problems and disputes later on. This guide sets out the key legal steps you need to take, from planning and naming your business to registering with the authorities and meeting your ongoing obligations.

1) Develop a business plan

A business plan is not a legal requirement, but it is the foundation of a successful start. It forces you to think through your target market, pricing, costs, sales forecasts and how you will fund the venture. If you need external finance, lenders and investors will expect a detailed plan. If you are self-funding, a one-page plan or business model canvas can be enough to keep you focused. A clear plan also makes it easier to choose the right legal structure and identify the licences, insurance and registrations you will need.

2) Choose and protect your business name

Your business name should be distinctive and easy to remember, but it must also be legally available. If you form a limited company, the name must be unique on the Companies House register and cannot be the same as, or too similar to, an existing company name. You should also check the Intellectual Property Office trade marks database to make sure you are not infringing someone else’s brand.

Certain words are classed as “sensitive” and need approval before you can use them in a company name. Examples include “Institute,” “Tribunal,” “Royal,” “British” and “Authority.” Remember that your company name does not have to be the same as your trading or brand name, but you must display your registered company name and other details on official correspondence and your website.

3) Choose a legal structure and register your business

Most UK start-ups operate as a sole trader, partnership or limited company. The right choice depends on your level of risk, how you want to pay tax and whether you plan to employ people.

• Sole trader – the simplest structure. You run the business as an individual and keep all the profits after tax, but you are personally responsible for any business debts. You must register for Self Assessment with HMRC by 5 October in your business’s second tax year.
• Partnership – two or more people share profits, losses and responsibilities. Each partner registers for Self Assessment and pays tax on their share of profits. A limited liability partnership offers liability protection but has more filing requirements.
• Limited company – a separate legal entity from its owners, which means your personal assets are usually protected if the business fails. You must incorporate at Companies House and pay the £12 online registration fee. Directors have legal duties to act in the company’s best interests and file annual accounts and a confirmation statement.

There is no longer a paper “IR6” form for registering as self-employed. Registration is done online through your HMRC business tax account.

4) Register for taxes and National Insurance

Once your business is registered, you must make sure HMRC knows about your income and any relevant taxes. Sole traders and partners pay Income Tax and National Insurance contributions through Self Assessment. From April 2024, self-employed people no longer pay Class 2 National Insurance contributions, but you may still pay Class 4 contributions on profits above the relevant threshold.

Limited companies must register for Corporation Tax within three months of starting to trade and pay Corporation Tax on taxable profits. If your business’s taxable turnover exceeds the VAT threshold – currently £85,000 and frozen until April 2026 – you must register for VAT. You can also register voluntarily if it makes sense for your cash flow or credibility.

If you employ staff, you must register as an employer with HMRC and set up a PAYE scheme to deduct Income Tax and National Insurance from wages. You will also need to pay employer National Insurance contributions on salaries above the relevant threshold.

5) Get the right insurance

Insurance protects your business, your customers and your employees. Some policies are compulsory, while others are sensible depending on what you do.

• Employers’ liability insurance is a legal requirement if you employ anyone other than certain close family members in some circumstances. You need cover for at least £5 million and you must display your certificate of insurance.
• Professional indemnity insurance is important if you give advice or provide professional services, as it covers claims for negligence or mistakes.
• Public and product liability insurance protects you if a customer or member of the public is injured or their property is damaged because of your business activities.
• Motor insurance is compulsory for any vehicle owned or used by the business.

Depending on your sector, you may also need cyber insurance, business contents insurance or specialist cover. Always check what your clients, regulators or trade bodies require.

6) Check licences, permits and data-protection requirements

Many businesses need specific licences or permits before they can trade legally. The rules vary by industry and location, so use the GOV.UK licence finder to check what applies to you. Common examples include food business registration, alcohol licences, street trading licences, waste carrier licences and childcare or health-related registrations.

If you process personal data – for example, customer names, email addresses or payment details – you must comply with UK GDPR and may need to pay the data protection fee to the Information Commissioner’s Office. There are exemptions for some organisations, but most businesses that hold personal information must register.

7) Understand your ongoing responsibilities

Your legal duties do not end once you are registered. If you rent or buy business premises, you may have to pay business rates to your local council and comply with planning rules, fire safety regulations and accessibility requirements. Even home-based businesses may need planning permission or must inform their mortgage lender or landlord.

If you employ people, you must:

• Register as an employer with HMRC and operate PAYE correctly.
• Pay at least the National Minimum Wage or National Living Wage. From April 2025, the National Living Wage for workers aged 21 and over is £12.21 per hour, with lower rates for younger workers and apprentices.
• Provide a written statement of employment particulars from day one.
• Automatically enrol eligible staff into a workplace pension scheme and make employer contributions.
• Provide payslips, holiday entitlement and a safe working environment.

Company directors also have statutory duties, including keeping accurate accounting records, filing annual accounts and confirmation statements with Companies House, and submitting a Company Tax Return to HMRC.

Keep good records and seek advice

Good record-keeping is essential. You must keep evidence of income, expenses, VAT records and payroll information for the required periods. Using accounting software can help you stay organised and meet Making Tax Digital requirements where they apply.

If you are unsure about any part of the process, speak to a qualified accountant, solicitor or business adviser. Getting professional advice early can save you money and stress, and help you build a business that is legally compliant from day one.

For more practical guidance, read our articles on choosing between a sole trader and a limited company and legal responsibilities when starting a business.