Setting up as a sole trader is one of the quickest and simplest ways to start a business in the UK. With less red tape than forming a limited company, it's a popular choice for freelancers, tradespeople and consultants. However, the paperwork can still feel confusing, especially when faced with various official forms. A common question is: does a sole trader need a company registration number to trade legally?
The short answer is no. As a sole trader, you are the business in a legal sense. You don't have a separate legal identity from your work. Because you're not incorporating a separate entity at Companies House, you don't receive a registration number. This is a fundamental difference between being self-employed and running a limited company.
A Company Registration Number (CRN) is a unique sequence of eight characters issued by Companies House. It's only given to limited companies and limited liability partnerships (LLPs) upon formation.
If you're operating as a sole trader, you haven't "incorporated." You're simply a person working for themselves. If a form or supplier asks for a company registration number, you can leave it blank or write "N/A."
You're running your business under your own name or a chosen trading name, but legally, you remain an individual. This distinction matters because it affects liability, tax treatment, and administrative requirements.
While you don't need a company registration number, you can't ignore your obligations to HMRC. You must register for Self Assessment as soon as you start earning more than £1,000 in a tax year from self-employment.
Registering for Self Assessment makes your business official in the eyes of the tax office. Once complete, HMRC issues you a Unique Taxpayer Reference (UTR). This ten-digit code is your most important piece of business identification.
You'll use your UTR to:
This UTR is often what people are actually looking for when they ask if you have a registration number. It serves a similar purpose to a CRN but for individuals rather than companies.
Register for Self Assessment by 5 October following the end of the tax year in which you started trading. For example, if you started in September 2025, register by 5 October 2026.
It's easy to get caught up in terminology. Many people ask if sole traders have a company number because they want to ensure professional credibility. In the UK, your credibility as a sole trader isn't tied to a number from Companies House. Instead, it's tied to your status with HMRC and your National Insurance contributions.
Your UTR and National Insurance number are the two primary identifiers you'll use for almost all official business. Whether you're opening a business bank account or applying for a mortgage as a self-employed person, these are the numbers that matter.
If you're ever in doubt, remember: a CRN belongs to a company, while a UTR belongs to you as a taxpayer.
Although you don't need a company registration number, there are other administrative milestones you might hit as your business grows.
VAT Registration: If your taxable turnover exceeds £90,000, you must register for VAT. You can also register voluntarily if it benefits your business—for example, if most of your customers are VAT-registered businesses who can reclaim the VAT you charge them.
Business Licenses: Depending on your work, you might need a license from your local council. This applies to street trading, selling alcohol, taxi services, or certain professional services.
Data Protection: If you store personal information about customers, you may need to register with the Information Commissioner's Office (ICO). This costs £40-£60 annually depending on your organisation size.
Business Insurance: While not always legally required, professional indemnity and public liability insurance are often expected by clients and provide essential protection.
Trading Name Registration: If you're trading under a name different from your own, you don't need to register it formally. However, you must display your real name and address on business documents.
Hiring Staff: If your business grows and you need help, you'll need to register as an employer and set up PAYE (Pay As You Earn) for tax and National Insurance.
Understanding the differences helps clarify why registration requirements vary:
Legal Status: Sole traders and their business are legally one. Limited companies are separate legal entities.
Liability: Sole traders have unlimited liability—personal assets are at risk if the business fails. Limited companies offer limited liability protection.
Tax: Sole traders pay income tax on profits through Self Assessment. Limited companies pay corporation tax, and directors pay income tax on salaries and dividends.
Admin: Sole traders have simpler bookkeeping and filing requirements. Limited companies must file annual accounts and confirmation statements with Companies House.
Privacy: Sole trader details aren't on public record. Limited company information is publicly available via Companies House.
Costs: Sole trader setup is free (except accountancy costs). Limited companies have formation fees and ongoing compliance costs.
There may come a time when you decide to change structure. As profits increase or if you want to protect personal assets from business risks, you might choose to become a limited company.
This is the only point when the answer to "do sole traders have a company number" changes. When you incorporate, you essentially "close" your sole trader status and move everything into a new legal entity. Only then will Companies House issue you a CRN.
Common triggers for incorporation include:
Until that day, sole trader status remains the simplest way to manage your affairs. It involves less public disclosure and fewer filing requirements than a limited company.
Navigating the early stages of business can be daunting. At Simply Accounts, we specialise in taking the guesswork out of your finances. We understand you want to focus on your work, not on deciphering which registration codes apply to you.
We work with you to ensure you're registered with the correct authorities from day one. Whether that means setting up Self Assessment, helping you understand your UTR, or managing VAT returns, we provide clear and practical guidance.
We ensure your registration questions are answered and your books are kept in perfect order, so you can focus on growing your business with peace of mind. By partnering with us, you get more than just an accountant—you get a team ensuring you're set up properly for long-term success.
If you're ready to get your business set up correctly or worried about missing a registration deadline, get in touch with Simply Accounts. We provide the expert support you need to stay compliant and confident as a sole trader.
Contact us today to discuss your requirements and find out how we can simplify your accounting.
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