How to Register a Limited Company in the UK

Forming a limited company in the UK is one of the simplest pieces of business administration there is: it can be done online, for a small fee, and often within a single working day. The complexity is not in the registration itself but in understanding the decisions you are making — about directors, ownership, shares and what the company is for. This guide walks through the process and what happens once you are incorporated.

This article is general information, not legal or financial advice. Confirm requirements on GOV.UK or with a qualified accountant or solicitor.

What "registering a company" means

Registering a limited company — known as incorporation — creates a separate legal entity, distinct from you as an individual. That separation is the whole point: the company can own assets, sign contracts and owe debts in its own name, and the owners' liability is generally limited to what they have invested.

You incorporate through Companies House, the UK's registrar of companies. For the wider context of going limited versus other structures, our guide on how to start a business in the UK covers the choice of business type before you reach the registration step.

What you need before you start

Have these ready and the online form takes minutes:

• A company name that is unique and not too similar to an existing one, and that avoids restricted or sensitive words without permission.
• A registered office address — an official UK address for the company, which appears on the public register.
• At least one director, aged 16 or over, responsible for running the company.
• At least one shareholder (often the same person as the director).
• Details of share capital — how many shares, of what value, held by whom.
• SIC code(s) describing the company's activities.
• A memorandum and articles of association — the founding documents; standard "model articles" are fine for most.
• People with significant control (PSC) details — anyone who owns or controls more than a quarter of shares or voting rights.

The roles: directors and shareholders

It is worth being clear on the difference, because new founders often blur them.

One person can hold all three roles. As you grow, these can separate — investors become shareholders without running the business, and you may appoint directors who hold no shares. Directors take on real legal duties; our explainer on company directors and the registered office covers those responsibilities in more depth.

Understanding share capital

When you incorporate, you decide the share structure — how ownership is divided. Many small companies keep this deliberately simple: a single share worth one pound, held by the founder. That establishes ownership and the limited-liability principle without overcomplicating things.

The share structure you choose at incorporation defines who owns the company and in what proportion. Keep it simple if you are on your own, but think carefully if there are co-founders or future investors.

Share capital can be increased later, and additional shares issued to bring in co-founders or investors. For the mechanics, see our explainer on what share capital is. The key idea at registration is that shares represent ownership and, in proportion, control.

Choosing SIC codes

A Standard Industrial Classification (SIC) code is a short numeric code describing what your company does — a consultancy, a retailer, a software firm and so on. You select at least one when registering. They are used for classification and statistics rather than to restrict your activities, but you should pick the codes that genuinely reflect your main business. You can choose more than one if the company does several things.

The registration process, step by step

1. Check your name is available on the Companies House register and not protected by trademark.
2. Decide directors, shareholders and PSCs.
3. Set the share structure and capital.
4. Choose your SIC code(s).
5. Adopt articles of association (model articles for most).
6. Submit the application online to Companies House and pay the fee.
7. Receive your certificate of incorporation, usually within a day, with your unique company number.

Many founders incorporate directly; others use an accountant or a formation agent who handles the filing as part of a package. As an example of how new companies announce this milestone, consultancy CM Beyer's note that the firm is now operational marks exactly the point at which a freshly incorporated company begins trading.

What happens after incorporation

Registering is the beginning, not the end, of your obligations. Once incorporated you must:

• Keep statutory registers and company records.
• File a confirmation statement at least once a year, confirming your details are up to date.
• Prepare and file annual accounts with Companies House.
• Register for the right taxes — Corporation Tax, and VAT if you cross the threshold or choose to register; see our guide to UK VAT registration.
• Tell HMRC when the company starts trading and meet Corporation Tax deadlines.
• Set up a business bank account, which keeps company money properly separate.

Mixing personal and company finances is one of the most common early mistakes; opening a dedicated business bank account from the outset avoids it.

The bottom line

Registering a UK limited company is quick, cheap and largely a matter of having your details ready: a name, a registered address, at least one director and shareholder, a share structure and SIC codes. The certificate of incorporation arrives fast — but the real work is understanding the roles you have created and meeting the ongoing duties of filing accounts, confirmation statements and tax. Get those rhythms right from day one, and the limited company structure does exactly what it is designed to do: give your business a clean, credible legal identity of its own.