Three credit reference agencies hold the financial data that lenders use to make decisions about you. Experian, Equifax, and TransUnion each maintain your credit history independently, which means your credit profile can look different depending on who is checking it. Understanding how these agencies work, and why they differ, can help you manage your credit more effectively.

Disclosure: NimbleFins has been acquired by ClearScore. Some references to ClearScore services and products on this site reflect that relationship.

What are credit reference agencies?

Credit reference agencies (CRAs) are regulated companies that collect, store, and share your financial information with lenders. They act as a link between banks, credit card companies, and other data providers, and the lenders who want to assess your creditworthiness before approving an application.

When you apply for a mortgage, credit card, or personal loan, the lender checks your file with one or more of these agencies. Your credit report and score can influence whether you are approved and what interest rate you may be offered. CRAs are regulated by the Financial Conduct Authority (FCA) and are required to follow strict rules around data accuracy and consumer rights. More information about how CRAs operate is available in the Experian Credit Reference Agency Information Notice.

The three main UK credit reference agencies

The UK credit market is served by three main agencies: Experian, Equifax, and TransUnion. While they perform similar functions, they operate as separate companies with different data sources, scoring methods, and lender relationships. This means your credit profile can vary between agencies - a reality that can catch borrowers off guard.

How credit reference agencies work

Data providers such as banks, lenders, and utility companies share your account information with CRAs, who compile it into credit reports and calculate scores. When you apply for credit, lenders can access these reports to help inform their decisions. CRAs also gather public record information from sources including the electoral roll, county courts, and the Insolvency Service.

The three main UK credit reference agencies

Experian

Experian is the largest credit reference agency operating in the UK. Its roots date back to 1826, when a group of London merchants began pooling information on customers who failed to settle debts. Today, it maintains credit files for virtually every adult in the UK and is widely used by major banks and mortgage lenders.

Experian offers free credit reports and score monitoring through its app. In late 2025, it updated its scoring model to include new data such as rental payments, mortgage overpayments, and overdraft use, while also expanding its score range from 0-999 to 0-1,250.

Equifax

Equifax is the second-largest credit reference agency in the UK, with relationships across the lending sector including high-street banks and specialist lenders. It covers all forms of consumer credit and offers both free and paid services to help individuals access and monitor their credit files.

You can access your Equifax credit report for free via ClearScore or directly through the Equifax website.

Disclosure: NimbleFins has been acquired by ClearScore. Some links to ClearScore on this site reflect that relationship.

TransUnion

TransUnion became a major player in the UK market after completing its acquisition of Callcredit in June 2018. It is widely used by fintech lenders, online lenders, and identity verification services. TransUnion offers free score access through Credit Karma and its own website.

Key differences between the three agencies

Credit scoring ranges

Each agency uses a different scoring scale, which can create confusion when comparing your scores. The table below shows the current ranges. Note that Experian updated its scale in late 2025 from 0-999 to 0-1,250.

These different scales mean that a raw score with one agency cannot be directly compared to a score from another. Always compare your score against the specific agency's bands, not a universal standard. The underlying creditworthiness the score reflects is what matters to lenders.

Data sources and information held

The agencies collect data from different lenders and organisations, which can create variations in your credit files. For example, one agency might hold information from a lender that does not report to the others. Similarly, some utility companies or mobile phone providers may only share data with certain agencies.

This inconsistency means each agency may hold a different picture of your credit history. The FCA has identified this as a structural weakness in the UK credit system and is consulting on proposals to require lenders to share data more consistently across all three agencies.

Lender preferences

Different lenders use different agencies, though many check multiple sources for significant credit decisions such as mortgages. High-street banks typically work with Experian or Equifax, while many newer fintech lenders use TransUnion. Some specialist lenders focus on just one agency. Because of this, the outcome of your application may depend partly on which agency holds the most complete picture of your financial history.

What information do credit reference agencies hold?

Credit account information

CRAs collect detailed information about your credit accounts, including:

• Payment history for credit cards, loans, and mortgages

• Account balances and credit limits

• Length of credit relationships

• Types of credit products you hold

• Records of hard credit searches from recent applications

• Default notices, county court judgements (CCJs), and arrangements to pay

This payment and account data forms the core of your credit report and has the most significant influence on your credit score.

Additional data sources

Beyond credit accounts, agencies may also hold:

• Electoral roll information, including your current and previous addresses

• Public records such as bankruptcies, individual voluntary arrangements (IVAs), and debt relief orders

• County court judgements for unpaid debts

• Address history going back up to six years

• Financial associations with partners or family members through joint accounts

Data accuracy and your right to dispute errors

CRAs are required under the Consumer Credit Act 1974 to investigate any dispute you raise within 28 days and to correct inaccuracies that are proven. Errors can occur when lenders report incorrect information or when data is linked to the wrong person.

If you believe any information on your credit file is wrong, you can raise a dispute directly with the relevant CRA at no cost. You can also add a Notice of Correction, a short statement of up to 200 words, to explain any entry on your report. If the CRA does not resolve your complaint to your satisfaction, you can escalate to the Financial Ombudsman Service or the Information Commissioner's Office (ICO).

It is worth checking your reports across all three agencies, as an error may appear on one but not the others.

How lenders use credit reference agencies

The credit assessment process

When you apply for credit, lenders typically follow a process along these lines:

• Initial application: you provide personal and financial details

• Credit bureau check: the lender requests your credit report and, in some cases, your score

• Automated assessment: computer systems check your application against the lender's own criteria

• Manual review: more complex cases may involve a human reviewer

• Final decision: approval, rejection, or a conditional offer

Your credit report provides context about your financial behaviour over time. Lenders use this alongside their own internal criteria when reaching a decision. Eligibility for any credit product depends on each lender's individual assessment.

Why your score varies across agencies

Your credit scores will differ between agencies because they use different data sources, scoring models, and calculation methods. Lenders also apply their own criteria on top of credit bureau data, meaning two lenders using the same agency may reach different conclusions about the same application.

This variability explains why you might be approved by one lender but declined by another for a similar product. It does not necessarily mean your credit history is poor.

Accessing your credit reports

Your right to a free statutory credit report

Under UK law, you are entitled to request a statutory credit report from each agency free of charge. These reports contain all the information held on your file, though they may not include your credit score. You can request them at any time through each agency's website.

Free online accounts

All three agencies offer free online accounts that provide ongoing access to your credit report and score:

• Experian: free account via the Experian app or website (score now out of 1,250)

• Equifax: free access via ClearScore or directly through the Equifax website

• TransUnion: free account via the TransUnion website

NimbleFins is a credit broker, not a lender.

Disclosure: NimbleFins has been acquired by ClearScore. References to ClearScore products and services on this site reflect that relationship.

These accounts typically include monitoring alerts, score tracking over time, and suggestions for improvement. NimbleFins does not compare credit products or provide quotes directly.

Understanding your credit report

A typical credit report contains the following sections:

• Personal information: your name, date of birth, addresses, and electoral roll status

• Credit accounts: details of all credit products, payment history, and balances

• Public records: court judgements, insolvencies, and bankruptcies

• Credit searches: records of who has requested your file

• Financial associations: joint accounts or financial connections with others

It is worth reviewing each section carefully. Look for errors, outdated entries, or anything that looks unfamiliar. If you spot something that appears incorrect, contact the relevant agency to raise a dispute.

Improving your credit profile

Good credit habits across all three agencies

The following practices are generally recognised as positive credit behaviours. They may support your credit profile over time, though individual outcomes vary and cannot be guaranteed.

• Make payments on time: Payment history carries significant weight in credit scoring. Setting up direct debits for at least the minimum payment on credit accounts can help you avoid missed payments.

• Keep credit utilisation low: Using a smaller proportion of your available credit limits is generally viewed positively by lenders. A common guideline is to aim to stay below 30% of your total available credit.

• Maintain older accounts: The length of your credit history can be a positive factor. Keeping older accounts open, even if rarely used, may support this.

• Register on the electoral roll: Electoral roll registration helps lenders verify your identity and address history. It is one of the simplest steps you can take.

• Check all three reports regularly: Free accounts make it easy to monitor your files for errors, signs of fraud, or unexpected changes.

• Be selective about applying for credit: Each full credit application leaves a record on your file. Multiple applications in a short period may be viewed negatively by lenders.

For more information, take a look at ClearScore’s guide to improving your credit score.

Always make sure you can afford repayments before taking on any form of credit or debt.

Setting up monitoring alerts

All three agencies offer monitoring services that can alert you to:

• New accounts opened in your name

• Changes to your credit score

• New hard searches on your file

• Updates to public record information

• Potential fraud activity

Catching problems early gives you more time to take action before they affect a credit application. With FCA proposals aimed at improving data sharing between agencies, maintaining good credit habits across all three will become increasingly important for borrowers seeking competitive lending terms.

Important information

NimbleFins is a credit broker, not a lender.

Disclosure: NimbleFins has been acquired by ClearScore. References to ClearScore on this site reflect that relationship.

Always make sure you can afford repayments before applying for any credit product.