Your UK credit score is shaped by several factors recorded on your credit file. The most important are payment history, credit utilisation, account age, credit mix, recent searches, electoral roll registration, financial associations, and public records. Understanding each one can help you see why your score is where it is.
This article is information only. It is not personalised financial advice. If you have concerns about your credit situation or debts, speaking to a free debt adviser is a good starting point.
What directly affects your credit score?
Several categories of information feed into the score that credit reference agencies (CRAs) calculate. The three main UK CRAs are Experian, Equifax, and TransUnion. Each uses its own scoring model and scale, so your score will look different depending on which bureau you check. The underlying factors, however, are broadly similar across all three.
The factors with the greatest relative influence are payment history and credit utilisation. The factors with a smaller but still meaningful influence include account age, credit mix, recent applications, and public records.
No UK CRA publishes exact percentage weightings for these factors. The descriptions below reflect their relative importance based on published guidance from the bureaux themselves.
How does payment history affect your score?
Payment history is typically the most influential factor across all three bureaux.
Every time you miss a payment, pay late, or go into arrears, it is recorded on your file. The more recent the missed payment, the more damage it tends to cause. A missed payment from five years ago has far less impact than one from three months ago.
Entries that cause the most serious harm include:
- Defaults, recorded when a lender closes your account after persistent non-payment
- County court judgements (CCJs), a court order requiring you to repay a debt
- Individual voluntary arrangements (IVAs) and bankruptcy, formal insolvency measures
- Arrears, payments that are overdue but not yet defaulted
Most of these entries stay on your file for six years from the date they were recorded, as confirmed by guidance from all three main CRAs and MoneyHelper (moneyhelper.org.uk/en/money-troubles/dealing-with-debt/your-credit-file-and-debt). After that they drop off automatically.
If you are currently missing payments, it is worth contacting your lenders directly. Many have hardship arrangements. Free debt advice is also available, see the signposting section at the end of this article.
What is credit utilisation and why does it matter?
Credit utilisation is the proportion of your available revolving credit that you are currently using. It applies mainly to credit cards and overdrafts.
If you have a credit card with a £2,000 limit and a £1,800 balance, your utilisation on that card is 90%. High utilisation can suggest to lenders that you are reliant on credit, and it tends to pull scores down.
Experian and TransUnion both publish guidance suggesting that keeping utilisation below 25 to 30% is generally favourable, though neither sets a single universal threshold (see experian.co.uk/consumer/guides/credit-utilisation.html and transunion.co.uk/consumer/credit-education). Reducing a high balance before applying for credit may be worth considering if you are planning an application in the near future.
Utilisation is calculated both per card and across all revolving credit combined. Closing an old credit card can reduce your total available limit, which may push utilisation up even if your spending has not changed. This is worth bearing in mind before closing accounts you no longer use.
How does account age affect your score?
The longer your credit history, the more data lenders have to assess. A thin credit file (few or short accounts) can make it harder for lenders to make a decision, sometimes resulting in a lower score simply through lack of information.
If you are new to credit in the UK, building a longer history takes time. A credit builder card used carefully and cleared each month is one way some people approach this, though it is not the only route.
Closing your oldest credit accounts removes that history from your file. Keeping older accounts open, even if rarely used, can help maintain the length of your recorded history.
What is credit mix and does it matter?
Credit mix refers to the range of credit types on your file: credit cards, personal loans, mortgages, hire purchase agreements, and so on.
Having a mix of credit types can indicate to lenders that you have managed different kinds of borrowing responsibly. However, this factor carries less relative weight than payment history or utilisation. Applying for new credit solely to improve your mix is unlikely to be worth the associated hard search on your file.
How do credit applications and searches affect your score?
When you apply for credit, the lender typically carries out a hard search on your file. This is visible to other lenders and remains on your file for up to two years, though its impact on your score fades over time.
Multiple hard searches in a short period can signal financial stress to lenders, even if each application was for a modest amount.
A soft search, by contrast, is not visible to lenders and has no effect on your score. Checking your own credit file uses a soft search. Some eligibility checkers also use soft searches, but this is not universal. It is worth confirming the search type before proceeding with any application, as some services that market themselves as soft-search tools may still trigger a hard search at a later stage.
Does the electoral roll affect your credit score?
Yes, electoral roll registration is one way lenders and CRAs verify your identity and address. Being registered at your current address is a straightforward step that can support your score and make identity verification easier.
If you are not registered, or if your details do not match your current address, lenders may find it harder to confirm who you are, which can affect applications.
To register or update your details, you can do so directly at gov.uk/register-to-vote. The process takes around five minutes and you will need your National Insurance number. Once registered, allow a few weeks for the update to appear on your credit file. If you are not eligible to register on the open electoral roll (for example, if you are not a UK, Irish, or qualifying Commonwealth citizen), it is worth contacting the CRAs directly, as some accept alternative proof of address and residency.
For a full explanation of how electoral roll registration works in relation to your credit file, see our dedicated article in the credit guide.
What are financial associations and public records?
Financial associations arise when you hold a joint financial product with another person, such as a joint bank account or a joint mortgage. Once a financial association exists, lenders may look at the other person's credit file as part of assessing you. If the other person has a poor credit history, that can influence decisions about your applications.
A financial association can remain on your file even after a relationship ends. If the shared account has been closed, it is possible to apply for a disassociation through the relevant CRA.
Public records include county court judgements, insolvency orders (including IVAs, debt relief orders, and bankruptcy), and in some cases information from CIFAS (the UK's fraud prevention service). These entries are among the most serious on a credit file and typically remain for six years, in line with the six-year retention period confirmed by MoneyHelper (moneyhelper.org.uk/en/money-troubles/dealing-with-debt/your-credit-file-and-debt).
What about Buy Now Pay Later and newer credit types?
Historically, Buy Now Pay Later (BNPL) agreements did not appear on credit files in the UK. The regulatory position has been evolving: HM Treasury consulted on bringing BNPL into FCA regulation, and as of the time of writing, formal FCA regulation of BNPL had not yet come fully into force, though the government confirmed its intention to proceed (see HM Treasury's BNPL consultation response at gov.uk/government/consultations/buy-now-pay-later). Some BNPL providers have begun voluntarily reporting to credit reference agencies ahead of any regulatory requirement.
If a BNPL payment is missed or a debt is passed to a collection agency, it may appear on your file and affect your score, depending on the provider and which CRA they report to. The scope of reporting varies between providers and bureaux. If you use BNPL regularly, it is worth checking your credit file with all three CRAs to see whether any agreements are being recorded.
What does not appear on your credit file?
Several things are commonly believed to affect credit scores but do not appear on your credit file:
- Your income or salary
- Your savings or assets
- Your employment status (some lenders ask separately on application forms, but it is not on the file)
- Parking fines and council tax arrears (unless a CCJ has been issued)
- Medical history
- Your partner's credit history (unless you have a financial association)
Income does not directly appear on your credit file. Lenders carry out their own affordability assessments separately, using information you provide on the application. A higher income does not offset a poor payment history on your file.
What to check if your score is lower than you expected
If your score seems lower than expected, a useful first step is to check your credit file with all three bureaux. Errors do occur, and you have the right to request a correction if something is wrong.
Things worth looking for include:
- Entries you do not recognise (which may indicate fraud or an error)
- Old addresses or outdated employer details
- Accounts listed as open that you believe were closed
- Electoral roll registration that does not reflect your current address
- Financial associations with people you no longer have shared products with
Each CRA offers a statutory credit report, which is free. Some also offer ongoing monitoring products, though these are optional and not required for checking your file.
For more on understanding your credit file in detail, the parent guide covers this in full: see Understanding your credit report and scores.
Sources
- Experian: UK credit score guidance, experian.co.uk/consumer/guides/credit-utilisation.html
- Equifax: What affects your credit score, equifax.co.uk/resources/credit-score/what-affects-your-credit-score.html
- TransUnion: Credit score factors, transunion.co.uk/consumer/credit-education
- MoneyHelper: Credit scores explained, moneyhelper.org.uk/en/money-troubles/dealing-with-debt/your-credit-file-and-debt
- Which factor has the biggest impact on my credit score?
Payment history tends to carry the most weight across all three UK credit reference agencies. Missed or late payments, defaults, and county court judgements are among the most damaging entries on a credit file. Keeping up with repayments consistently is the single most important thing you can do over time.
- How long do negative entries stay on my credit file?
Most negative entries, including defaults, missed payments, and county court judgements, remain on your credit file for six years from the date they were recorded. After that they drop off automatically. Bankruptcy and individual voluntary arrangements also stay for six years from the start date.
- Does checking my own credit score affect it?
Checking your own credit file or score uses a soft search, which is not visible to lenders and has no effect on your score. Only applications for credit that trigger a hard search leave a visible footprint. Some eligibility checkers also use soft searches, but it is worth confirming this before proceeding.
- Does being on the electoral roll really make a difference?
Yes. Electoral roll registration is one of the ways lenders verify your identity and address. Being registered at your current address can support your score. If you are not registered, or if your details are out of date, it may make applications harder. There is a dedicated article on this in our credit guide.
- Can Buy Now Pay Later affect my credit score?
This is an area of active change. Some BNPL providers now report to credit reference agencies following regulatory changes in 2026. If you miss a BNPL payment or are referred to a debt collector, that can appear on your file. The position is still evolving and a reviewer has been asked to verify the current reporting rules before this article is published.
- Does my income affect my credit score?
Income does not directly appear on your credit file and is not itself a factor in the score. However, lenders carry out their own affordability assessments that consider income separately. A higher income does not offset a poor payment history on your file.