Understanding exactly what affects your credit score helps you make informed decisions about your finances and avoid inadvertently damaging your score. UK credit reference agencies use a wide range of factors to assess your creditworthiness — this article breaks each one down. For practical steps to improve your score, see our full guide to improving your credit score.
Payment history
Your track record of paying bills, loans and credit agreements on time is the single most influential factor. A consistent history of on-time payments builds trust with lenders, while missed or late payments can significantly reduce your score and remain visible on your credit file for six years.
Credit utilisation
This measures how much of your available credit you are using at any given time. If you have a credit card with a £2,000 limit and typically carry a balance of £1,800, your utilisation is 90% — a level that lenders generally view negatively, even if you make all your payments on time. Keeping utilisation below 30% of your available credit, and ideally lower, is generally recommended.
Length of credit history
A longer credit history gives lenders more data to assess your behaviour over time. This is one reason closing old credit accounts — even ones you rarely use — can sometimes reduce your score, as it shortens your overall credit history and reduces your total available credit.
Number and type of credit accounts
Having a mix of different credit types — such as a credit card, a mobile phone contract and perhaps a personal loan — can demonstrate to lenders that you can manage various forms of credit responsibly. However, having too many accounts, or opening several in a short period, can have the opposite effect.
Recent credit applications
Each time you apply for credit, the lender typically performs a hard search on your credit file, which is recorded and visible to other lenders for 12 months. Multiple hard searches in a short timeframe can suggest financial difficulty to lenders, even if each individual application was approved. Using soft-search eligibility checkers before applying can help you avoid unnecessary hard searches.
Electoral roll registration
Being registered on the electoral roll at your current address helps confirm your identity and stability to lenders, and not being registered can negatively affect your score. This is one of the simplest factors to address — registration is free and quick at gov.uk/register-to-vote.
County Court Judgments and defaults
Serious negative marks such as County Court Judgments (CCJs), defaults, and bankruptcy have a substantial negative impact on your credit score and remain on your file for six years. These are generally the most damaging entries on a credit file and take the longest to recover from.
Financial associations
If you have a joint account, joint mortgage, or have applied for credit jointly with someone else, your credit files become linked through a financial association. This means their credit history can influence how lenders view your application, even if your own credit behaviour is strong. If a financial association is no longer relevant — for example, after a relationship ends — you can apply to have it removed once joint financial products are closed.
Address stability
Frequent house moves, particularly in a short period, can be viewed cautiously by some lenders, as stability of address is sometimes used as an indicator of overall financial stability. This is a relatively minor factor compared to payment history and utilisation, but it can contribute to the overall picture.
Errors on your credit file
Sometimes a lower than expected score is simply due to errors — an incorrectly recorded late payment, an account that does not belong to you, or out of date information. Checking your credit report regularly with the major UK credit reference agencies (Experian, Equifax and TransUnion) helps catch and correct errors before they cause lasting damage.