UK Credit Score: How to Check and Improve It

Your credit score affects whether you can get a mortgage, credit card, phone contract, or even rent a flat. A good score unlocks better interest rates and more options. A bad one can cost you thousands. This guide explains exactly how UK credit scores work and what you can do to improve yours.

What Is a Credit Score?

A credit score is a numerical rating of your creditworthiness. Lenders use it to decide whether to lend you money and at what interest rate. It is based on your financial history — how you have borrowed, repaid, and managed credit over time.

Think of it as a financial report card. The higher the score, the more trustworthy lenders consider you. A strong score means lower interest rates, higher credit limits, and easier approval. A weak score means fewer options and higher costs.

Importantly, there is no single UK credit score. Each of the three credit reference agencies calculates its own score based on the data they hold about you. Lenders may check one, two, or all three when making a decision.

The Three Credit Reference Agencies

In the UK, three companies hold your credit information. Each uses a different scoring system, so your score will differ between them.

Experian

• The largest credit reference agency in the UK.
• Score range: 0 to 999.
• A score of 881 or above is considered “good.” 961+ is “excellent.”
• Used by most major lenders, including mortgage providers.

Equifax

• One of the oldest credit reference agencies globally.
• Score range: 0 to 700.
• A score of 421 or above is considered “good.” 561+ is “very good.”
• Used by many banks and credit card providers.

TransUnion

• Previously known as Callcredit.
• Score range: 0 to 710.
• A score of 561 or above is considered “good.” 604+ is “very good.”
• Used by some lenders, particularly for car finance and mobile phone contracts.

Since each agency may hold slightly different information about you, it is worth checking all three. A lender might see a completely different score than the one you checked online.

How to Check Your Credit Score for Free

You have a legal right to see your credit report. Several services in the UK let you check your score for free.

Tip: Check all three free services. Each uses a different agency, so your scores will vary. Lenders may pull from any of them, so knowing all three gives you a complete picture.

Check your score regularly — at least once a quarter. This helps you spot errors, track improvements, and catch fraud early.

Factors That Affect Your Credit Score

Credit reference agencies use several factors to calculate your score. While the exact weighting is proprietary, the general breakdown is:

Payment History (approximately 35%)

This is the single biggest factor. Lenders want to see a track record of paying bills on time.

• Late payments stay on your file for six years.
• Even one missed payment can drop your score significantly.
• Payments 30 or more days late get reported to credit reference agencies.
• Consistently paying on time builds a strong foundation.

Set up direct debits for all regular bills — council tax, utilities, phone contracts, credit card minimums. Even paying one or two days late can be recorded.

Credit Utilisation (approximately 30%)

Credit utilisation is the percentage of your available credit that you are using. Lenders see high utilisation as a sign of financial stress.

The formula:

Credit utilisation = (Credit used / Credit limit) x 100

Example: You have a credit card with a £3,000 limit and a £1,000 balance. Your utilisation is 33% — borderline. Experts recommend keeping utilisation below 30%. Below 10% is even better.

How to reduce utilisation:

• Pay down existing balances.
• Request a credit limit increase (but do not spend more).
• Make multiple payments throughout the month instead of one lump sum.
• Do not close old credit cards — this reduces your total available credit and pushes utilisation up.

Length of Credit History (approximately 15%)

The longer your credit history, the more data lenders have to assess your reliability. A long history of responsible borrowing helps your score.

• Closing old accounts can shorten your history and lower your score.
• If you are new to credit, it takes time to build a score.
• Lenders typically like to see an average account age of five years or more.

Rule of thumb: Do not close old accounts, even if you no longer use them. An unused card with no balance costs you nothing and adds length to your credit history.

New Credit Applications (approximately 10%)

Each time you apply for credit, it leaves a hard search on your file. Too many applications in a short period signal desperation to lenders.

• Hard searches stay on your file for two years.
• Multiple applications can lower your score by 50 to 100 points.
• Space out applications by at least three months.

Credit Mix (approximately 10%)

Lenders like to see that you can manage different types of credit responsibly.

• A mix of credit cards, a personal loan, and a mortgage is positive.
• Having only one type of credit is less favourable.
• This factor has a relatively small impact, so do not take on new credit just to diversify.

Other Factors

• Electoral roll registration: Being registered to vote at your current address adds credibility and can boost your score.
• County Court Judgments (CCJs): These stay on your file for six years and severely damage your score.
• Bankruptcy and IVAs: Major negative marks that stay on your file for six years.
• Financial associations: If you have a joint account or mortgage with someone who has poor credit, it can affect your score.

Hard Searches vs Soft Searches

Understanding the difference between hard and soft searches is critical for managing your credit score.

Soft Searches

• Do not leave a mark on your credit file.
• You can check your own score as many times as you like without impact.
• Eligibility checkers use soft searches to show your likelihood of approval.
• Pre-approved offers from lenders are soft searches.

Hard Searches

• Leave a visible mark on your credit file.
• Every lender can see hard searches from the past two years.
• Multiple hard searches suggest you are desperate for credit.
• Each one can lower your score by a small amount.

Before applying for any credit product, use an eligibility checker. Most credit card providers and comparison sites offer one. It shows your chances of approval without affecting your score. Only submit a full application once you are confident you will be accepted.

How to Improve Your Credit Score

Improving your score is not instant, but consistent habits make a real difference over weeks and months.

1. Register on the Electoral Roll

This is one of the simplest and most effective steps you can take. Being on the electoral roll verifies your identity and address, which lenders use to confirm you are who you say you are.

• Register online at gov.uk/register-to-vote.
• Takes about two minutes.
• Completely free.
• Update your registration every time you move address.

Impact: Can add a meaningful boost to your score within one to two months.

2. Pay Every Bill on Time

Payment history is the single biggest factor. Set up direct debits for all regular bills. If you cannot pay the full amount, at least pay the minimum on time, every time.

• Missed payments stay on your file for six years.
• Even one late payment can drop your score significantly.
• If you are struggling, contact your lender. Many will work with you to arrange a payment plan.

3. Keep Credit Utilisation Below 30%

Aim to use less than 30% of your available credit across all cards. Below 10% is ideal.

• Pay off credit card balances in full each month if possible.
• If you cannot pay in full, pay more than the minimum.
• Consider requesting a credit limit increase (but do not spend more).

4. Do Not Apply for Too Many Products

Each application leaves a hard search on your file. Space out applications by at least three months. Use eligibility checkers first.

• Only apply for credit you are likely to get.
• Do not apply just because you received a pre-approved offer.
• Multiple rejections in a short period can significantly damage your score.

5. Check for Errors on Your Report

Mistakes on your credit report are more common than you might think. Regularly checking and correcting errors can give your score a quick boost.

What to look for:

• Accounts you do not recognise (possible fraud).
• Incorrect balances or credit limits.
• Wrong address or name spelling.
• Late payments that were actually on time.
• Accounts that should have been removed after six years.

If you find an error, contact the credit reference agency to dispute it. They must investigate within 28 days.

6. Keep Old Accounts Open

The longer your credit history, the better. Do not close old accounts unless they have high fees or tempt you to overspend.

7. Build Credit If You Have None

If you are new to the UK or have never borrowed, you may have a thin credit file.

• Consider a credit-builder credit card. These have low limits and higher interest rates, but they help you build a track record.
• Use it for small purchases and pay it off in full each month.
• Register on the electoral roll immediately.
• Open a bank account and keep it in good standing.

Worked Example: Improving From 650 to 750

Here is a realistic example of how a 25-year-old in the UK can improve their Experian score over six months.

Starting Position

Steps Taken

Month 1: Register on the electoral roll.

• Visit gov.uk/register-to-vote.
• Takes two minutes.
• Estimated impact: +20 points within one to two months.

Months 1 to 6: Pay every bill on time.

• Set up direct debits for all regular bills.
• No missed payments for six consecutive months.
• Estimated impact: +30 points over six months.

Months 1 to 3: Reduce credit utilisation from 80% to 30%.

• Pay down £2,500 of the £4,000 balance over three months.
• New balance: £1,500 on £5,000 limit = 30% utilisation.
• Estimated impact: +50 points.

Month 2: Check for and dispute one error.

• An old mobile phone account that was closed still shows as open with a £50 balance.
• Dispute with Experian. Account corrected.
• Estimated impact: +10 points.

Result After Six Months

With a score of 750, this person now qualifies for much better mortgage rates. On a £200,000 mortgage over 25 years, moving from a “fair” to “good” rate could save over £50,000 in interest.

How Long Do Negative Marks Stay on Your File?

After six years, most negative marks are removed from your file automatically. A settled debt looks much better than an outstanding one, so always pay what you owe if possible.

Common Credit Score Myths

Checking your score affects it

False. Checking your own score is a soft search and does not affect it at all. Check as often as you like.

Closing old accounts improves your score

Not necessarily. Closing accounts reduces your total available credit, which pushes your utilisation ratio up. It can also shorten your credit history. Keep old accounts open.

You have one credit score

Incorrect. Each of the three agencies calculates a different score. Lenders may use any of them, or a combination.

Your salary affects your credit score

Not directly. Your salary does not appear on your credit report. However, lenders may ask for it when you apply, and it affects what they are willing to lend you.

Being refused credit ruins your score

False. Being refused does not affect your score. However, the hard search from the application remains on your file for two years.

Key Takeaways

• Your credit score is used by lenders to assess how likely you are to repay borrowed money.
• There are three credit reference agencies in the UK: Experian, Equifax, and TransUnion.
• Payment history and credit utilisation are the two biggest factors in your score.
• Check your score for free through ClearScore, Credit Karma, or Experian.
• Register on the electoral roll — it is quick, free, and effective.
• Keep credit utilisation below 30%.
• Pay every bill on time.
• Do not apply for too many credit products at once.
• Check your report regularly and correct any mistakes.
• Keep old accounts open to maintain a long credit history.

References

• MoneyHelper — Credit Scores and Credit Reports
• Experian — UK Credit Score Ranges
• Which? — How to Improve Your Credit Score