Last updated: 2 September 2026
Everything you need to know before forming a limited company in Northern Ireland, from the Belfast team that has done it more than 22,000 times.
Is a limited company the right choice?
Most people starting a business in Northern Ireland choose between being a sole trader and forming a private limited company. A limited company is a separate legal person: it owns its contracts, bank account and debts, and your personal liability is generally limited to what you have put in. It also tends to look more established to customers, lenders and Invest NI or council grant programmes, and it lets you bring in shareholders later.
The trade-off is administration. A company must file a confirmation statement and accounts with Companies House every year and register for corporation tax with HMRC. If you are unsure, our guide to which company type to choose covers limited companies, LLPs, CICs and companies limited by guarantee.
What makes Northern Ireland different?
Northern Ireland companies are UK companies registered with Companies House, so the law and the filing regime are the same as in England, Wales and Scotland. Three things are specific to NI:
- The company number starts with NI, and the registered office must stay in Northern Ireland for the life of the company.
- The registered office must be a physical Northern Ireland address where official post can be received. Many owners use a Belfast registered office address rather than their home.
- Cross-border trade. Under the Windsor Framework, goods businesses in NI have arrangements for trading with both Great Britain and the EU that differ from the rest of the UK. If your business moves goods, take advice on this before you set up.
Step 1 — Choose and check your company name
Your name must be unique on the Companies House register and must not be “too like” an existing name. Certain words — “Northern Ireland”, “Ulster”, “Belfast City”, “Royal”, “Chartered”, “Bank” and many others — need permission or evidence before they can be used. Run your idea through the free company name check on our homepage, and see the list of sensitive words that need approval.
Step 2 — Decide the people and the shares
You need at least one director (aged 16 or over) and at least one shareholder; they can be the same person. Decide how many shares to issue and at what value — most small companies start with a small number of £1 ordinary shares. If more than one person is involved, think now about the split and whether you want different share classes; our guide to structuring shares explains the options. Anyone with more than 25% of the shares or votes is a person with significant control (PSC) and must be recorded.
Step 3 — Registered office and addresses
Every company needs a registered office in Northern Ireland, a registered email address for Companies House correspondence, and a service address for each director (which can be the registered office). Your registered office appears on the public register, which is why many home-based businesses use a professional address instead.
Step 4 — Verify your identity
Since November 2025, every director and PSC must verify their identity with Companies House before the company can be incorporated. You can do this yourself through GOV.UK One Login, or through an Authorised Corporate Service Provider such as The Company Shop, online or in person in Belfast. Doing it before you order the company avoids the most common delay.
Step 5 — Choose your SIC code
Companies House asks for at least one Standard Industrial Classification code describing what the company does. Our SIC code guide lists them.
Step 6 — Incorporate
The application goes to Companies House with a memorandum and articles of association. Most companies adopt the model articles; if you need bespoke articles for multiple share classes, investor rights or a family company, we can prepare them. Straightforward applications are usually approved within one to two working days, and you receive a certificate of incorporation with your NI company number.
You can order your Northern Ireland company online and we review the details before submitting so that names, addresses and share structures are right first time.
Step 7 — After incorporation
- Register for corporation tax with HMRC within three months of starting to trade. See registering your new company for tax.
- Open a business bank account — banks will ask for the certificate of incorporation and proof of the directors’ identities.
- Consider VAT registration if turnover will exceed the threshold, or voluntarily if your customers are VAT-registered.
- Keep statutory registers — see our guide to keeping company records.
- Diary the confirmation statement, due within 12 months, and the first accounts.
Support for new Northern Ireland businesses
Northern Ireland has its own start-up support that businesses elsewhere in the UK do not get. Go Succeed, delivered through the eleven councils, offers free mentoring and start-up planning. nibusinessinfo.co.uk is the official guidance site for NI businesses. Invest NI supports businesses with growth and export ambitions. None of these form the company for you, but they are worth knowing before you start.
Frequently asked questions
Can I form a Northern Ireland company if I live in the Republic of Ireland?
Yes. There is no residency requirement for UK company directors. You will need a Northern Ireland registered office — see our package for Irish residents.
Do I need an accountant to form a company?
No, but you will probably want one for accounts and tax once you are trading. Many Northern Ireland accountants ask us to handle the formation and share structure and then take over the ongoing compliance.
Can I change from sole trader to limited company later?
Yes — it is one of the most common reasons people form a company. The business’s assets are transferred to the new company and HMRC is told the sole trade has ceased.
Ready to start?
Check your company name, then start your order online or call our Belfast team on 028 9055 9955 to talk it through first.
This article is for general information only and reflects the position as at the date of publication. It does not constitute legal, accounting or professional advice and should not be relied upon as such. Fees, rules and deadlines may change. You should seek advice from a suitably qualified professional before acting on anything covered here.