Starting a business in the UK means making one important decision early: what legal structure will you use? For most serious entrepreneurs, the answer is a private limited company. This guide walks you through exactly how to register a limited company in the UK, what it costs, what you need to prepare, and how the process compares to setting up an LLC in the United States.
Why Register as a Limited Company?
A limited company is a separate legal entity from you as an individual. That single fact changes everything. Your personal assets are protected from business debts. You pay corporation tax rather than income tax on profits. You project a level of credibility that sole trader status simply does not. Whether you are a freelancer turning professional, a founder raising investment, or a side hustler scaling up, a limited company gives you a real foundation.
Sites like NerdWallet and Investopedia cover the basics, but here at Hustler’s Library we go deeper into what actually matters for entrepreneurs building real businesses.
The Registrar: Companies House
All UK limited companies are registered with Companies House, the official UK government registrar. The process is straightforward, entirely online, and costs just £12 when you register via the Companies House Web Filing portal. Third-party formation agents typically charge £30 to £100 but add little value for most straightforward registrations.
What You Need Before You Start
Before you hit the registration page, have the following ready:
- Company name: Must be unique, must end in “Limited” or “Ltd,” and cannot be misleading. Use the Companies House name checker to confirm availability.
- Registered address: This is a UK address that appears on public record. It does not have to be your trading address. Many entrepreneurs use a virtual office service or their accountant’s address.
- SIC code: The Standard Industrial Classification code describes your business activity. You select it during registration from a government list. Pick the most accurate match; you can add more later.
- Director details: Full name, date of birth, nationality, and residential address (kept private) plus a service address (public).
- Shareholder details: Who owns shares and in what proportion. You can be the sole director and sole shareholder simultaneously.
Memorandum and Articles of Association
Every company has two constitutional documents. The memorandum of association confirms that the founding members agree to form the company. The articles of association set out the rules for how the company is run. When you register online, Companies House automatically provides model articles, which are suitable for most small businesses. You do not need to draft custom articles unless your setup is unusual, for example if you have multiple share classes or investor provisions.
The Registration Process Step by Step
- Go to register.companieshouse.gov.uk and create an account.
- Choose “Private Limited Company” as your company type.
- Enter your company name and check availability.
- Add your registered office address and select your SIC code(s).
- Add director(s) and shareholder(s) with their details.
- Accept the model articles (or upload custom ones).
- Pay the £12 fee by debit or credit card.
- Receive your Certificate of Incorporation, usually within 24 hours, sometimes within a few hours.
Your certificate includes your company registration number (CRN), which you will use on all official correspondence, contracts, and invoices from day one.
After Registration: What Comes Next
Registration is the beginning, not the end. Once your company exists, you have ongoing obligations:
- Confirmation statement: Filed annually with Companies House. Costs £34 if filed online. Confirms that your company information is still accurate.
- Annual accounts: Submitted to both Companies House and HMRC each year.
- Corporation tax registration: You must register with HMRC for corporation tax within three months of starting to trade.
- VAT registration: Required if your turnover exceeds £90,000. Optional below that threshold but sometimes advantageous.
For a deep dive into your tax obligations once you are set up, read our guide on HMRC and UK tax for small businesses.
How Does This Compare to a US LLC?
American entrepreneurs often ask how a UK limited company compares to an LLC. The structures serve similar purposes, but there are key differences. In the US, LLC formation is handled state by state with fees ranging from $50 in Kentucky to $500 in Massachusetts. There is no federal equivalent of Companies House. In the UK, everything goes through one central registrar at a fixed £12 fee. A UK Ltd has stricter filing requirements (annual accounts are publicly visible on Companies House) but offers a clean liability shield. Tax treatment also differs: LLC income typically flows through to the owner’s personal return in the US, while a UK Ltd pays corporation tax separately as a distinct legal entity.
Recommended Reading
If you want to go deeper on the legal and operational side of running a UK company, a dedicated formation guide is worth having. Search Amazon for a current edition: UK limited company formation books on Amazon. A good guide will cover shareholder agreements, dividend strategy, and director duties in far more detail than any website.
Also from Hustler’s Library: our breakdown of sole trader vs limited company if you are still deciding which structure fits, and our guide on personal guarantees, which often come up when opening business credit accounts.
The Bottom Line
Registering a UK limited company is one of the cheapest, fastest, and most consequential things you can do as an entrepreneur. For £12 and about 30 minutes of your time, you get a legal entity, liability protection, and a professional foundation for everything that follows. There is almost no reason not to do it if you are serious about building a business in the UK.
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