How to Register a Business in the UK: 2026 Guide

Registering a business in the UK can be done in under 24 hours. The government fees start at zero for sole traders and just £12 for a limited company, and the entire process is available online. Yet the decision that matters most — choosing the right business structure — is where many first-time founders trip up.

That choice affects how much tax you pay, whether your personal assets are exposed to business debts, and how much administrative work you take on year after year. Getting it right from the start saves you time, money, and the hassle of restructuring later.

This guide covers how to register a business in the UK in 2026, step by step. We walk through the differences between sole trader and limited company structures, explain how to register a business name, break down the exact costs and timelines, and flag the ongoing obligations that most guides skip entirely.

Choose the Right Business Structure Before You Register

The structure you choose determines your tax obligations, personal liability, and record-keeping requirements. Most UK businesses register as either a sole trader or a limited company, though partnerships and LLPs are also available.

As a sole trader, you have unlimited personal liability — your personal assets are on the line if the business runs into debt. You pay Income Tax on profits through Self Assessment, and you keep everything that remains after tax. The upside is simplicity: according to GOV.UK, you can start trading straight away without registering, provided your trading income stays below £1,000 per tax year.

A limited company is a separate legal entity. It can own assets, earn income, and pay taxes entirely separately from your personal finances. Company owners are liable only up to the value of their investment. The trade-off is more administration: you must file annual accounts and a confirmation statement with Companies House, and follow specific rules when taking money out of the company through salary, dividends, or directors' loans.

You can move from one structure to another. Going from sole trader to limited company is the most common transition, and it is generally more straightforward than moving in the other direction.

Sole Trader vs Limited Company: Key Differences

When a Partnership or LLP Makes More Sense

If two or more people are going into business together, you have additional options. An ordinary partnership works similarly to being a sole trader — each partner shares responsibility for the business debts and pays tax on their share of the profits through Self Assessment.

A limited liability partnership (LLP) offers members limited liability while still being taxed as individuals. LLPs register with Companies House and file annual accounts, making them more admin-heavy than ordinary partnerships but offering better personal protection. Limited partnerships, where at least one partner retains unlimited liability, are less common and typically used in specific investment structures.

How to Register a Business Name in the UK

Sole traders can trade under their own name or choose a trading name with minimal restrictions. If you are Sarah Jones and want to trade as "Bright Ideas Consulting," you simply use that name on invoices and correspondence — no formal name registration is needed.

Limited companies must follow Companies House naming rules. Your chosen name cannot be the same as, or too similar to, an existing registered company. It must not contain offensive terms or suggest a government connection without approval. Certain sensitive words and expressions — such as "Royal," "British," or "Authority" — require specific permission before use.

Checking Name Availability and Protecting Your Brand

Companies House provides a free name availability checker on its website. Before you commit, search for your preferred name and review any similar entries on the register.

A registered company name is not the same as a trademark. Registration with Companies House gives you the right to use that name as your company's legal identity, but it does not stop someone else from trading under a similar name in a different context. For broader brand protection, consider registering a trademark through the Intellectual Property Office.

Step-by-Step: Registering as a Sole Trader

Sole trader registration is handled by HMRC, not Companies House. There is no fee.

What You Need Before You Register

To register online through GOV.UK, you will need:

• Your National Insurance number
• Your contact details and address
• Your business start date
• A description of what your business does
• A Government Gateway account (you can create one during the registration process)

You must register for Self Assessment if you earn more than £1,000 from self-employment in a tax year (6 April to 5 April). The deadline to register is 5 October in your business's second tax year, though registering earlier is advisable so you are set up for your first tax return.

Registering for VAT and Other Obligations

You must register for VAT once your taxable turnover exceeds the mandatory threshold set by HMRC. Check the current threshold on GOV.UK, as it is reviewed periodically. Voluntary registration below the threshold can be worthwhile if your customers are primarily VAT-registered businesses, since you can then reclaim VAT on your own purchases.

If you work in the construction industry, you may also need to register under the Construction Industry Scheme (CIS).

Step-by-Step: How to Register a Limited Company in the UK

You can register a limited company with Companies House online, by post, or through a formation agent. The online route is the quickest and cheapest option.

Before registering, you may need to verify your identity through GOV.UK One Login. You will receive a unique personal code to confirm your identity has been verified.

To register, you will need to provide:

• Your chosen company name (checked for availability)
• A UK registered office address — this is publicly visible on the Companies House register
• Details of at least one director (who can also be the sole shareholder)
• Details of shareholders and the share structure
• Articles of association (standard model articles are available if you do not need bespoke ones)
• A SIC code describing your business activity

The standard online registration fee is £12, with processing typically completed within 24 hours. Same-day incorporation is available for £30. Postal applications take 8 to 10 days.

Documents You Receive After Incorporation

Once your company is successfully registered, you will receive:

• A Certificate of Incorporation confirming your unique company number and date of formation
• Your Memorandum and Articles of Association

HMRC will automatically send a Corporation Tax registration letter, usually within about two weeks of incorporation. You will use this to set up and file your Corporation Tax returns.

Using a Formation Agent vs Registering Directly

Registering directly with Companies House is cheaper and perfectly manageable if you are comfortable handling the details yourself. Formation agents streamline the paperwork and often bundle useful extras — a registered office address, mail forwarding, and template documents — into a single package. For most straightforward incorporations, either approach works well.

Registration Costs and Timelines in 2026

Here is what you will pay in government fees to register a business in the UK:

Hidden Costs New Business Owners Overlook

Registration fees are only the starting point. Factor these common expenses into your first-year budget:

• Accountancy fees — limited companies typically cost more to service than sole traders, given the additional filing requirements
• Bookkeeping software — cloud accounting tools such as Xero or FreeAgent carry monthly subscription costs
• Business insurance — professional indemnity or public liability cover may be essential depending on your sector
• Domain and website costs — even a basic professional online presence involves hosting and domain registration fees

These are not reasons to delay registration, but they are worth planning for so there are no surprises.

What to Do Immediately After Registration

Registration is the starting line, not the finish. Here is what to prioritise in the first few weeks:

Open a business bank account. Limited companies should do this straight away to separate business and personal finances. Sole traders are not legally required to have a separate account, but it simplifies bookkeeping considerably.

Set up accounting records from day one. Whether you use cloud software or a spreadsheet, tracking income and expenses from the outset is far easier than trying to reconstruct records months later.

Learn your filing deadlines. Limited companies must file annual accounts within 9 months of their accounting reference date. The confirmation statement is due at least once every 12 months (£13 to file online). Your Corporation Tax return must be filed within 12 months of the accounting period end, with tax payment due within 9 months and 1 day. Sole traders must file their Self Assessment return by 31 January following the end of the tax year.

Ongoing Compliance Obligations Most Guides Skip

Beyond annual filings, limited company directors must keep the Companies House register up to date. This includes recording changes to directors, your registered office address, or persons of significant control (PSC).

If you hire staff — or pay yourself a salary through a limited company — you will need to register as an employer with HMRC and operate PAYE.

If your business holds personal data about customers or clients, you may need to register with the Information Commissioner's Office (ICO) for data protection purposes.

Which Structure Should You Choose? A Decision Framework

Rather than offering a single answer, consider these factors:

A common rule of thumb: a limited company structure often becomes more tax-efficient once profits exceed roughly £30,000 to £50,000 per year, though this depends on your individual circumstances. If you are unsure, speaking to an accountant before you register is a sound investment. Many UK accountants offer a free initial consultation, and the potential tax savings from choosing the right structure can significantly outweigh the cost of that advice.

Getting Your Business Off to a Strong Start

Registering a business in the UK is one of the more straightforward administrative tasks you will face as a founder — the process can genuinely be completed within a single day for most structures. What matters more is making an informed choice about your structure and staying on top of your obligations from the outset.

Use the free tools on GOV.UK and the Companies House website to get started, and seek professional advice where the tax or liability implications are significant. Once you are registered and thinking about building your digital presence, get in touch with our team — we help UK businesses put the right technical foundations in place from day one.