UK Credit Score: What Actually Moves It, What the Three Agencies Show and How to Improve It

The Three UK Credit Reference Agencies: What They Each Hold

The United Kingdom has three main credit reference agencies: Experian, Equifax, and TransUnion (formerly Callcredit). Each holds a credit file on most UK adults with a credit history, compiled from data supplied by lenders, utility companies, telecoms providers, public records including the electoral roll and court judgments, and the agency's own proprietary data sources.

Critically, not all lenders report to all three agencies. Some lenders report only to Experian, some only to Equifax or TransUnion, and some to all three. This means your credit file at each agency may contain different information and show a different picture of your credit history. A mortgage lender may search all three; a credit card lender may search only one. The score shown on a consumer credit portal - Experian's CreditExpert, Equifax's Credit Report, or TransUnion's Credit Karma partnership - is a proprietary score calculated by the agency for consumer information purposes and is not the same model used by lenders.

Under Section 7 of the Data Protection Act 2018 (implementing Article 15 of the UK GDPR), every UK individual is entitled to a free copy of their statutory credit report from each agency within 30 days of request. The statutory report contains all the data the agency holds and is more comprehensive than the consumer portal view, which summarises rather than displays raw data. Checking all three statutory reports annually is sound financial hygiene, particularly before a major credit application.

Payment History: The Dominant Factor

Payment history is the single most influential factor in UK credit assessment. Every missed or late payment is reported to the relevant credit reference agencies and marked on the credit file as a late payment, default, or arrangement to pay. The severity and age of the mark determines its impact on credit assessments.

A late payment - a payment made after the due date but before the account defaults - typically appears as a one, two, or three-month late payment marker. These marks reduce creditworthiness materially when recent but have progressively less impact as they age. Most UK lenders focus on the most recent 24 months of payment history when making credit decisions.

A default is a formal marker registered by a lender when an account has been significantly in arrears - typically three to six months of missed payments - and the lender has issued a default notice under Section 87 of the Consumer Credit Act 1974. A default stays on the credit file for exactly six years from the date the default was registered, regardless of whether the debt is subsequently repaid in full. This six-year retention period is established by the Information Commissioner's Office guidance on credit reference data. Paying a defaulted debt removes the outstanding balance but does not remove the default marker from the credit file.

Credit Utilisation: The Most Controllable Factor

Credit utilisation is the ratio of current credit card and revolving credit balances to the total available credit limit across all accounts. A credit card with a £5,000 limit carrying a £4,000 balance has 80% utilisation. High utilisation - typically above 30% in UK lender models, though the specific threshold varies by lender and product - is associated with higher credit risk and suppresses credit scores.

Utilisation is calculated both at the individual account level and across all revolving credit. A single maxed card suppresses scores even if other cards are unused. The most efficient action for someone with high utilisation and no ability to pay down balances is to request a credit limit increase on existing cards - this immediately reduces the utilisation ratio without requiring debt repayment. Not all limit increase requests are approved, and some carry a hard search, but those that are approved through a soft or automatic review can have an immediate positive impact.

Paying credit card balances in full each month before the statement date - rather than after the statement date - means the balance reported to credit reference agencies is lower, since most lenders report the statement balance rather than the intra-month balance. For active credit card users who pay in full, this is a practical way to maintain lower reported utilisation without changing spending behaviour.

Electoral Roll Registration: Fastest Single Improvement

Registration on the electoral roll at the current address is one of the most immediately actionable steps for improving credit assessment outcomes. Lenders use electoral roll data for identity and address verification. A prospective borrower not registered at their stated address creates an identity verification problem that frequently results in declined applications regardless of other credit factors.

The electoral roll can be updated at any time through gov.uk/register-to-vote. Registration typically reflects on credit files within a few weeks of the Electoral Registration Officer updating the register. For individuals who have recently moved, registering at the new address immediately rather than waiting for the annual registration canvass significantly accelerates the credit file update.

What Improves UK Credit Scores - and What Does Not

Actions that reliably improve UK credit assessment outcomes include: maintaining an unblemished payment history on all current accounts; reducing credit utilisation below 30% across revolving accounts; registering on the electoral roll at the current address; maintaining a mix of credit types (revolving credit such as credit cards alongside instalment credit such as personal loans); and keeping the oldest credit accounts open to maintain credit history length.

Actions frequently believed to improve credit scores that do not reliably do so include: closing old credit card accounts (which typically increases utilisation and reduces history length); applying for multiple credit products in a short period to find the best rate (which generates multiple hard searches that suppress scores temporarily); and checking your own credit score (soft searches do not affect credit files regardless of frequency).

A County Court Judgment (CCJ) registered against a UK individual appears on credit files for six years and significantly suppresses credit outcomes. A CCJ can be set aside if the debt is repaid within one calendar month of judgment, in which case it is removed from the register. Repaying a CCJ after one month marks it as satisfied but does not remove it from the credit file.

Frequently Asked Questions

Is there a single UK credit score?

No. Experian, Equifax, and TransUnion each hold separate credit files and calculate their own proprietary scores for consumer information. Lenders use their own internal credit models, which incorporate data from one or more of the agencies but produce a different score from any consumer-facing portal. The score you see online is indicative, not the score lenders use.

How long does a default stay on a UK credit file?

Six years from the date the default was registered, regardless of whether the debt is repaid. Paying a defaulted debt does not remove the default marker - it changes its status from unsatisfied to satisfied, which is marginally more positive, but the mark remains for the full six-year period. The six-year retention period is established by ICO guidance on credit reference data retention.

Does checking my credit score affect it?

No. Checking your own credit file generates a soft search, which is visible only to you and does not affect credit assessments. Hard searches - generated when you apply for credit and the lender checks your file - do affect scores temporarily. Multiple hard searches in a short period suppress scores more than single searches, though the impact typically fades within six months.

Should I close old credit card accounts to improve my score?

Typically no. Closing old credit card accounts reduces total available credit, which increases utilisation ratio if any balances remain on other cards. It also reduces the average age of credit accounts. Both effects are negative for credit assessment outcomes in most models. Old accounts with no annual fee and zero balance are usually better left open.