Your credit score is one of the most important numbers in your financial life. It influences whether lenders will offer you a mortgage, credit card or personal loan — and what interest rate you'll pay if they do. A higher score generally means better terms and more options. Yet many people in the UK have little idea what their score actually is, or what affects it.
This guide explains how credit scores work in the UK, what influences them, and practical steps you can take to improve yours over time.
What is a credit score?
A credit score is a number that represents how creditworthy you appear to lenders based on your borrowing history. In the UK, three main credit reference agencies — Experian, Equifax and TransUnion — hold data about your credit behaviour and calculate scores based on that data. Lenders use this information, alongside their own criteria, to decide whether to lend to you and on what terms.
Each agency uses its own scoring system and scale, so your score will differ between them. Experian uses a scale of 0 to 999, Equifax uses 0 to 1,000, and TransUnion uses 0 to 710. What matters more than the specific number is which band you fall into — poor, fair, good, very good or excellent.
You can check your credit score for free through services such as Experian, ClearScore (which uses Equifax data) and Credit Karma (which uses TransUnion data). Checking your own score does not affect it.
What affects your credit score?
Several factors influence your credit score. Understanding them helps you prioritise what to work on.
Payment history
This is the single most important factor. Paying bills and credit agreements on time, every time, demonstrates reliability to lenders. Late or missed payments can have a significant negative impact and remain on your credit file for six years.
Credit utilisation
This refers to how much of your available credit you are using. If you have a credit card with a £5,000 limit and you regularly carry a balance of £4,500, your utilisation is 90% — which lenders view as a sign of financial stress. Keeping utilisation below 30% of your available credit is generally recommended, with lower being better.
Length of credit history
The longer your credit history, the more data lenders have to assess your behaviour. Closing old accounts can shorten your credit history and reduce your score, so it is often worth keeping older accounts open even if you rarely use them.
Types of credit
Having a mix of different types of credit — such as a credit card, a personal loan and a mobile phone contract — can show lenders that you can manage different forms of borrowing responsibly. However, you should never take on credit you do not need simply to improve your score.
Recent applications
Every time you apply for credit, the lender carries out a hard search on your credit file. Multiple hard searches in a short period can suggest to lenders that you are desperate for credit, which can lower your score. Soft searches, such as checking your own score or getting an eligibility check, do not affect it.
Electoral roll
Being registered on the electoral roll at your current address confirms your identity and address to lenders. It is one of the simplest and quickest things you can do to improve your score. You can register at gov.uk/register-to-vote.
How to improve your credit score step by step
1. Check your credit report for errors
Start by checking your credit report with all three agencies. Errors are more common than you might expect — an incorrectly recorded missed payment or an account that does not belong to you could be dragging your score down. If you find an error, contact the credit reference agency to raise a dispute. They are legally required to investigate.
2. Register on the electoral roll
If you are not already registered to vote at your current address, do this immediately. It is free, takes minutes at gov.uk/register-to-vote, and can improve your score quickly.
3. Pay everything on time
Set up direct debits for at least the minimum payment on all credit agreements so you never miss a payment. Even a single missed payment can have a meaningful negative impact. If you are struggling to make payments, contact your lender — they may be able to arrange a payment plan that minimises damage to your credit file.
4. Reduce your credit utilisation
If you regularly use a high proportion of your credit limit, try to pay down your balance or ask for a credit limit increase (without spending more). Either approach reduces your utilisation ratio. Check whether your card issuer reports to credit agencies at the statement date or at month end, and time your payment accordingly.
5. Avoid making multiple credit applications in a short period
Each hard search stays on your file for 12 months. Space out credit applications and use eligibility checkers before applying — these use soft searches that do not affect your score.
6. Keep old accounts open
Unless an account carries a fee you want to avoid, keeping old credit accounts open (even unused) maintains your credit history length and available credit, both of which can benefit your score.
7. Build credit if you have little history
If you have a thin credit file — perhaps because you are young or have recently moved to the UK — consider a credit builder card. These typically have low credit limits and high interest rates, but used carefully (spend a small amount each month and pay it off in full) they can help establish a credit history.
8. Check for financial associations
If you have a joint account or have applied for credit jointly with someone who has a poor credit history, their record may be linked to yours through a financial association. If the relationship is over, you can apply to have the association removed.
How long does it take to improve a credit score?
There is no instant fix. The time it takes depends on what is causing your score to be lower. Registering on the electoral roll can make a difference within weeks. Reducing utilisation can show improvement at the next reporting cycle. Negative marks such as missed payments, defaults or county court judgements (CCJs) remain on your file for six years, though their impact reduces over time.
With consistent, responsible behaviour — paying on time, keeping utilisation low, not making unnecessary applications — most people can see meaningful improvement within six to twelve months.
What to do if you have serious credit problems
If you have CCJs, defaults, an IVA or bankruptcy on your file, these are more serious issues that take time to resolve. They remain visible on your credit file for six years. During this period, some mainstream lenders will decline your application, though specialist lenders may still consider you — usually at higher rates.
If you are struggling with debt, free, confidential help is available from organisations including StepChange (stepchange.org), National Debtline (nationaldebtline.org) and Citizens Advice (citizensadvice.org.uk).