How to check if a UK company is legitimate

Before you work with a business – whether you’re making a purchase, forming a partnership, or signing a service agreement – it’s important to know who you’re dealing with. That’s especially true if the company is new to you, appears online with little background, or operates in a sector where trust is crucial.

In some cases, you may be evaluating a limited company that claims to be fully registered and reputable. In others, they may be a sole trader, a partnership, or even a business registered overseas. Whatever the setup, taking a few minutes to verify their legitimacy can help you avoid fraud, financial loss, or reputational damage.

A 2024 study by Visa revealed that two in five (40%) UK small businesses lost money to fraud, and nearly a third of victims (29%) said it damaged their confidence as decision-makers.

This guide explains how to verify a UK company’s identity, check its records and online reputation, and spot warning signs before entering into any financial or legal arrangement.

Why it’s essential to verify that a business is legit

Whether you’re making a one-off purchase from a business you’ve never heard of or considering a long-term partnership, trust is essential, and it starts with verification. Before you share any financial information, enter into a contract, or agree on terms, it’s important to confirm that the business is what it claims to be.

This might mean checking that:

• An online seller is a real, registered company, not a scam site set up overnight
• A potential partner is legally established and in good financial health before you sign a deal
• A supplier has an active business presence that you can easily link to directors, filings, or online reviews

Spending a few minutes verifying a company’s information can protect you from fraud, wasted time, and reputational harm. It helps ensure:

• You know who you’re really dealing with
• Your payment details and company data are better protected
• You’re trading with a properly registered and legally operating business
• You minimise the risk of unpaid invoices or partnering with a firm in financial distress

A step-by-step guide to verifying a business is legit

A business background check requires you to cross-reference company information provided on platforms like Companies House and HMRC. You’re looking for consistency. Cross-reference key details such as company registration numbers, business addresses, and people at the company. Legitimate companies will have matching details and make information like their company number easy to find for better transparency. 

• Companies House and HMRC: What business owners need to know
• What is company registration?
• Where is my principal place of business?

Look at the company’s website for documents on their terms of service or terms and conditions. Here you can find their company registration number. You can usually find a link to these documents at the very bottom of a website’s homepage.

Step 1 – Check Companies House

By law, every UK limited company must be registered with Companies House. Companies House lists important documents about companies that can be used to verify their legitimacy.

Enter the company number you found on its website to find it on Companies House. This will show you the company information and the filing history of the company documents.

If the company hasn’t been incorporated yet but wants to do business with you, this should raise questions about its legitimacy.

You can see the names of people at the company, such as directors and people with significant control (PSC). Later in step three, you’ll compare these names with director records in a business credit report – ensuring everything lines up accurately. It’s also a good idea to look up these names on LinkedIn – check their work history and any mutual connections you may have to verify their legitimacy.

On the Companies House search results, verify that:

• The registered company name and address match the details you’ve been given
• The company is active and trading
• Its accounts and confirmation statements are up to date – and if you’re considering a partnership, takeover, or merge, review the accounts in more detail to assess the company’s overall health
• The SIC code, which explains what the company does, matches what you’re expecting

Step 2 – Verify VAT registration through HMRC

Businesses with a total VAT taxable turnover of £90,000 or more over a 12-month period are legally required to register for VAT payments. VAT-registered companies will receive a unique VAT number, which you can use to check their details on the government’s official platform.

A valid number confirms the company is registered for VAT. HMRC’s records should match the information on Companies House, such as their business address and company number. 

If the business isn’t registered for VAT – or if the VAT number doesn’t match the business details you’ve found on its website or provided materials – this could indicate either an error or, in some cases, a deliberate attempt to mislead.

Step 3 – Use credit reporting services

Credit reporting agencies, such as Experian and Creditsafe, give you insights into a company’s financial health, showing you:

• Credit scores and payment history
• Director details
• Any County Court Judgments (CCJs) or insolvency warnings

Director details can be verified against information on Companies House to see if the company is accurate and consistent in its reporting. Timely payments in a company’s credit history are a positive signal of financial reliability, which is beneficial if you plan to invoice over time.

This step is handy for entering a partnership or considering a significant transaction. If you find a poor credit history or active CCJs, this could signal that the company has low liquidity and could face trouble paying for your goods and services.

Key red flags to watch out for

Be cautious if you notice any of the following warning signs when doing your checks. Sometimes it’s best to err on the side of caution if you see several inconsistencies, such as missing registration numbers or inactive status paired with a live website. This may indicate a higher risk of non-compliance and could mean the company isn’t a reputable business partner.

Registration red flags

Watch out for these red flags on public registers, such as Companies House or GOV.UK:

• No registered company number – Makes it difficult to verify on Companies House and may suggest deliberate avoidance of scrutiny.
• Unverified or suspicious addresses – UK businesses must register a genuine business address. Check to see if it’s missing or doesn’t match Companies House records.
• Inactive Companies House status – Check if the status is listed as dormant (not trading) or dissolved (no longer exists). If the company claims to be operating but Companies House says otherwise, this should raise alarm bells about its reputation.
• Repeated late filings or strike-off proposals – Consistent delays or warnings on Companies House filings often indicate poor compliance or deeper financial issues.

Website, payment, and reputational red flags

Now that you’ve established that a company is legitimate and trading legally in the UK, should you trade with them? Not necessarily.

Just because a business is registered and compliant doesn’t guarantee it will deliver a good service. A company can be legally sound yet have issues that affect reliability, costs, or customer satisfaction. Before deciding, it’s worth digging a little deeper with a few extra checks: 

• Poor-quality or outdated website – A rushed site with broken links, spelling errors, or no SSL certificate (no https:// in the URL or padlock) suggests a potential scam that could be trying to steal your data.
• Suspicious payment methods – If the company only accepts bank transfers or cryptocurrency, refunds will be difficult or impossible to process. Businesses that avoid card payments may try to avoid scrutiny or consumer protections. Instead, use companies that accept card payments.
• No clear contact details – Legitimate businesses provide a phone number, business email, or customer service channel. If you can’t find any, this is another warning sign to watch out for.
• Negative customer feedback – Persistent complaints on Trustpilot, Google, or Reddit should raise concerns about a company’s reputation.
• Inconsistent branding – Sloppy logos, poor grammar, or mismatched information across platforms often signal low credibility.
• Little to no social media presence – Nowadays, not having any social media accounts can indicate a company is trying to reduce its visibility. LinkedIn can be useful for finding employees and verifying their identities. If the company doesn’t have a LinkedIn page and claims to be an established business, it’s worth probing further.

Don’t be afraid to perform these extra checks to verify and help you get to know your potential business partners better. After all, this will be the start of building trust in your partnership.

Protect your business and build trust

Verifying a company protects you from fraud and helps you make safer business decisions. The same applies when setting up your own business – having it properly registered shows your customers and partners you’re legitimate and credible.

Registering your business with Rapid Formations will allow you to start on the right footing immediately. We’ll handle the company registration process on your behalf to ensure you meet all legal requirements in the UK.