Starting a Company in the UK: Your Ultimate Checklist

Starting a company in the UK: Your ultimate checklist

Starting a company in the UK involves legal registration, operational setup, and compliance with regulatory requirements. The process involves selecting a business structure, securing a company name, providing the required details to Companies House, registering with HMRC, and more. Each decision made during the formation stage is critical, as it affects liability, tax obligations, privacy, funding options, and a founder's ability to scale their business.

Person reviewing a starting a company checklist on a laptop, with checkboxes representing key business setup tasks.

Starting a company is an exciting journey, and getting the setup right from day one can save you time and keep the process smooth. This checklist helps UK-based founders navigate every major step from planning to launching legally, giving you the clarity and confidence to build on a solid foundation. Whether you're launching your first business or turning a side hustle into something formal, this guide breaks the process into clear, actionable stages to help you start with confidence.

Key Takeaways

Plan with confidence: Choose the right structure, secure funding, validate your idea, and avoid early legal and tax missteps.
Register the smart way: Use a company formation agent for privacy, compliance, and simplified setup.
Launch efficiently: Set up a business bank account, accounting system, insurance, and essential contracts from day one.
Stay compliant long-term: Understand your ongoing reporting duties with Companies House and HMRC to avoid penalties later.

Checklist overview

Here’s a look at the company formation stages this guide will cover:

Stage	Key decisions/actions
Planning & research	Business idea validation, structure choice, name check
Legal setup	Registered office, director/shareholder/PSC details, SIC code
Operations setup	Bank account, accounting system, tax and HMRC registration
Launch readiness	Website & domain setup, contracts and policies
Ongoing compliance	Annual filings, records, confirmation statements, updates to Companies House/HMRC

Let’s get started.

Pre-registration considerations

Before you begin the registration process, there are a few essentials to consider. These early decisions shape your tax responsibilities, funding options, and your ability to scale in future. Here are some actions to take:

Assess funding needs – estimate start-up costs and identify capital sources – personal savings, loans, grants, or investors. Limited companies often attract equity investment, while sole traders rely more on personal funds.
Search and secure a name – use CFD's name checker to confirm availability and check for existing trademarks to avoid disputes. Secure matching domain names and social handles for future branding.
Agree on ownership and shares – if forming a limited company, decide on the number of shares and who will hold them. Clear agreements now prevent shareholder disputes in the future.
Plan your registered address – choose whether to use a home, office, or professional registered address service for privacy and professionalism.

You’ll see from this list that many of your pre-registration considerations will depend on the type of business structure you choose, so let’s take a closer look at the options and jump into the first step in the company set up process.

1. Decide on your business structure

Your business structure determines how your company will operate from a legal standpoint, influencing everything from tax obligations to funding opportunities and personal liability. It might seem like a big decision, but there’s no need to feel overwhelmed. Here’s a clear breakdown of the most common UK business structures to help you confidently choose the one that fits your goals.

Private limited company (Ltd by shares): The most popular choice for small and growing businesses. It offers limited liability, meaning your personal assets are protected if the company runs into debt. A limited company also carries professional credibility, which can help when pitching to clients or investors.
Company limited by guarantee: Typically used by charities, clubs, or non-profits. Instead of shareholders, members guarantee a nominal amount if the company is wound up.
Limited Liability Partnership (LLP): Favoured by professional firms such as law practices or consultancies, it provides flexibility in profit distribution while protecting partners from personal liability.
Sole trader or partnership: Easier and quicker to start, with minimal paperwork, but you remain personally responsible for all debts and liabilities.

Choosing the right structure early helps prevent costly changes later on. Think about scalability, how you’ll raise funds, and what level of regulatory reporting and compliance you’re prepared to manage.

If you’re still unsure about the best structure for your business, let’s take a closer look at two structures many entrepreneurs decide between.

Limited company vs sole trader: Quick comparison

Feature	Limited company	Sole trader
Legal status	Separate legal entity from its owners. The company can own assets, enter into contracts, and be sued.	The individual is the business. No separation between personal and business activities.
Liability	Limited. Personal assets are generally protected. Shareholders only risk the value of their shares.	Unlimited. The owner is personally responsible for all debts and legal claims.
Taxation	Pays Corporation Tax on profits. Directors can take a salary and dividends (potentially more tax-efficient at certain income levels).	Pays Income Tax and National Insurance on total profits through Self-Assessment.
Filing requirements	Annual accounts, Confirmation Statement, and Corporation Tax return. Must maintain statutory records.	Annual Self-Assessment tax return. No requirement to file accounts with Companies House.
Privacy	Director and shareholder details are publicly visible on Companies House.	Greater privacy as only basic information is held by HMRC.
Funding options	Easier to attract investors, issue shares, or secure business loans.	Funding usually limited to personal savings or traditional loans.
Perception	Often viewed as more established and credible by clients, suppliers, and investors.	Flexible and straightforward, but may appear less formal.
Profit withdrawal	Owners can mix salary and dividends to optimise tax.	All profits belong to the owner and are taxed as personal income.
Best for	Entrepreneurs planning to grow, hire staff, or seek external investment.	Freelancers, consultants, or small businesses testing an idea with minimal admin.

Weigh up the pros and cons of each structure and assess which type best suits your needs. For example, a tech start-up expecting investor funding may prefer a private limited company, while a freelance designer might start as a sole trader.

2. Choose a company name

Your company name represents your brand and is an integral part of your legal identity. A well-chosen name is easy to remember, protects you from legal disputes, and sets the tone for your business. Here’s how you can choose and secure a strong, compliant company name:

Check availability: Use CFD's company name availability checker to ensure your name is unique. Avoid names that are too similar to existing companies to prevent rejection or potential trademark issues.
Follow the naming rules: Certain words (such as “Royal” or “Association”) require special permission. The name must usually end with “Limited” or “Ltd” unless you qualify for an exemption.
Think about digital presence: Secure a matching web domain and relevant social media handles early to protect your brand online.
Consider future flexibility: Choose a name that reflects your business purpose but allows for expansion into new markets or products.

A carefully selected name helps customers remember you and builds trust. Once you’ve confirmed your name, consider registering a trademark to safeguard it against competitors.

3. Register your limited company

With your structure and name in place, you can officially form your company. Registering your company gives your business legal recognition and creates a public record of key details.

Here are some useful checklists for each part of your application to make incorporating your company straightforward and stress-free.

If you use a company formation agent, such as Company Formations Direct, you can rest assured that the application and other legal admin and compliance tasks are taken care of.

Registered office address

This is the official address of your company and must be a full postal address in the country where your company is incorporated. PO Box addresses are not accepted. Companies House and HMRC will use this address to send all official correspondence, and it will appear on the public record.

If you don't have a UK-registered office or if you prefer to keep your residential address private, consider using a virtual office address service. This ensures compliance with regulations while protecting your privacy and enhancing your business image.

Standard Industrial Classification (SIC) code

A SIC code describes your company’s primary business activity for statistical and regulatory purposes. Review the government’s SIC list to find the code that corresponds to your business.

Director details

Every company needs at least one director responsible for managing operations and ensuring compliance with relevant regulations. You’ll need to provide:

Full name
Date of birth (must be at least 16 years old)
Occupation
Nationality
Residential address (not on the public register)
Service address (displayed on public record)

Founders who prefer not to disclose the director’s service address on the public record often opt for a registered office address service. This ensures their residential address remains private.

Outline how many shares will be issued, their value, and who owns them. Even sole founders must issue at least one share. You’ll need to provide:

Full name
Date of birth
Residential address (not on the public register)
Service address (displayed on public record)
Nationality
Three security details (these act as an online signature)
First three letters of mother’s maiden name
First three letters of father’s forename
First three letters of town of birth

You’ll also need to identify anyone who owns more than 25% of shares or voting rights or exerts significant influence. This is known as a Person with Significant Control. You’ll need to provide:

Nature of control (e.g. the person holds more than 50% to 75% of shares.)

Note: Since 18 November 2025, Companies House has made identity verification a compulsory part of the incorporation process and for new appointments of directors and PSCs. Every PSC has a 14-day period during which they must submit a statement confirming they have verified their identity, along with their Companies House personal code.

Secretary details (optional)

If you’ve chosen to become a private limited company, you can appoint a secretary. The role of the secretary is to assist the director with legal and administrative matters. A director can also be appointed as company secretary. If you wish to appoint a secretary, you will need the following details:

Full name
Date of birth (must be at least 16 years old)
Occupation
Nationality
Residential address (not on the public register)
Service address (residential or other address)

Again, if you prefer not to display the secretary’s service address on the public record, you can use CFD's trusted London address service.

Once you’ve provided all the necessary details, you can submit your application online for £50. Approval is often received within 24 hours if the information is accurate. After incorporation, Companies House will issue a Certificate of Incorporation – your proof that the company legally exists.

Next, you must register with HMRC for Corporation Tax within three months of trading. Depending on your plans, you may also need to register for VAT (if turnover is expected to exceed the £90,000 threshold) or PAYE if you intend to pay salaries.

Completing these steps carefully ensures your company is legally recognised and ready to trade. Errors at this stage can delay approval or create compliance issues later, so be sure to thoroughly review and double-check all details before submission.

4. Set up business operations after company registration

Once your company is officially formed, it’s time to set up the practical elements that enable day-to-day operations. This stage transforms your business from a legal entity into a functioning company.

Key operational tasks include:

Opening a business bank account – separate finances, keep your accounting clean, and protect your limited liability status.
Implementing an accounting system – whether you hire an accountant or use cloud software like Xero or QuickBooks, proper bookkeeping ensures you meet tax deadlines and maintain accurate records.
Arranging insurance – consider public liability insurance, professional indemnity cover, and employer’s liability insurance if you hire staff. These policies safeguard your business from unforeseen claims and boost client trust.
Protecting your intellectual property – register trademarks, copyrights, or design rights to prevent others from copying your brand or products.
Creating essential policies and contracts – draft employment contracts, privacy policies, and terms of service to stay compliant with employment and data protection laws.

Completing these tasks early saves time and reduces risk as you start trading. For example, having a business bank account from day one simplifies Corporation Tax calculations and makes it easier to demonstrate financial transparency to investors.

What are the most common company setup mistakes?

Even with a strong checklist, first-time founders often fall into avoidable traps. Learning from these common mistakes can save you time, money, and stress.

Typical pitfalls include:

Choosing a conflicting or restricted name – failing to check for trademarks or similar names can lead to rejection or legal disputes. Always search the Companies House database and the UK Intellectual Property Office.
Not considering search engine optimisation (SEO) or online presence – your name should be easy to search and consistent across domains and social platforms.
Using a personal address without privacy protection – listing your home as the registered office exposes personal details to the public. Using a virtual office or service address offers more security.
Setting up an unsuitable share structure too early – issuing the wrong number or class of shares can complicate future funding or investor negotiations. Plan for future needs before finalising.
Missing early tax deadlines – forgetting to register for Corporation Tax or VAT can trigger penalties and unnecessary HMRC scrutiny. Note key deadlines or use accounting management software, such as BrightManager, to automate reminders.
Neglecting statutory records– failing to maintain accurate director, shareholder, or PSC records creates compliance issues that are costly to correct.

By anticipating these missteps, you can make informed choices and protect your company’s credibility from the outset.

Get started today

Now that you have a clear, step-by-step guide to setting up a company in the UK, you can feel confident and prepared to begin whenever the timing is right. When you’re ready, you can apply online in minutes and get registered within one working day. Or speak to our formation team if you'd like personal help structuring and registering your company.

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Do I need a business plan?

Starting a company in the UK: Your ultimate checklist

In this article

Key Takeaways

Checklist overview

Pre-registration considerations

1. Decide on your business structure

Limited company vs sole trader: Quick comparison

2. Choose a company name

3. Register your limited company

Registered office address

Standard Industrial Classification (SIC) code

Director details

Secretary details (optional)

4. Set up business operations after company registration

What are the most common company setup mistakes?

Get started today

Your guide to setting up a limited company in the UK (2025)

What are company formation agents in the UK?

How much does it cost to set up a limited company in the UK?

Starting a company in the UK: Your ultimate checklist

In this article

Key Takeaways

Checklist overview

Pre-registration considerations

1. Decide on your business structure

Limited company vs sole trader: Quick comparison

2. Choose a company name

3. Register your limited company

Registered office address

Standard Industrial Classification (SIC) code

Director details

Shareholders and share structure

Secretary details (optional)

4. Set up business operations after company registration

What are the most common company setup mistakes?

Get started today

Related insights

Your guide to setting up a limited company in the UK (2025)

What are company formation agents in the UK?

How much does it cost to set up a limited company in the UK?