Your credit rating affects nearly every financial decision you make — from getting a mortgage to qualifying for a mobile phone contract. Yet many people do not understand how their score is calculated or what they can do to improve it. This guide breaks it all down in plain English.
What Is a Credit Rating?
A credit rating (or credit score) is a number that tells lenders how likely you are to repay borrowed money. It is based on your financial history and is used by banks, building societies, credit card companies, and other lenders to decide whether to lend to you and at what interest rate.
Think of it as a financial report card. A higher score means lenders see you as lower risk, which means better deals, lower interest rates, and more options.
The Three Credit Reference Agencies in the UK
In the UK, there are three main companies that hold your credit information. Each one produces its own score based on the data they hold about you.
Experian
- The largest credit reference agency in the UK.
- Scores range from 0 to 999.
- A score of 721 or above is considered “good.”
- Used by most major lenders.
Equifax
- One of the oldest credit reference agencies globally.
- Scores range from 0 to 1,000.
- A score of 670 or above is considered “good.”
- Used by many banks and credit card providers.
TransUnion
- Previously known as Callcredit.
- Scores range from 0 to 710.
- A score of 604 or above is considered “good.”
- Used by some lenders, particularly for car finance.
Important: Each agency may hold slightly different information about you, so your score can vary between them. Lenders may check one, two, or all three when making a decision.
What Factors Affect Your Credit Score?
Credit reference agencies use several factors to calculate your score. While the exact weighting can vary, here is a general breakdown of what matters most:
1. Payment History (approximately 35%)
This is the single biggest factor. Lenders want to see that you have a track record of paying bills on time.
- Late payments stay on your file for six years.
- A single missed payment can drop your score significantly.
- Even paying one or two days late can be recorded.
2. Credit Utilisation (approximately 30%)
This is the percentage of your available credit that you are actually using.
- If you have a £10,000 credit limit and use £3,000, your utilisation is 30%.
- Experts recommend keeping utilisation below 30%.
- Below 10% is even better for your score.
3. Length of Credit History (approximately 15%)
The longer your credit history, the more data lenders have to assess you.
- 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.
4. 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 suggest you are desperate for credit.
- Hard searches stay on your file for two years.
- Multiple applications can lower your score by 50–100 points.
5. Credit Mix (approximately 10%)
Lenders like to see that you can manage different types of credit responsibly.
- A mix of credit cards, a mortgage, and a car loan is positive.
- Having only one type of credit is less favourable.
- This factor has a relatively small impact.
Other Factors
- Electoral roll registration: Being registered to vote at your current address adds credibility.
- 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.
How to Check Your Credit Score for Free
You have a legal right to see your credit report. In the UK, you can check it for free through several services.
Experian
- Free service: Experian offers a free account with your score and report.
- Premium service: Experian Premium costs £14.99/month for additional features.
- Website: experian.co.uk
ClearScore
- Free service: Completely free, forever.
- What you get: Your Equifax score and full report, plus tips to improve.
- Website: clearscore.com
Credit Karma
- Free service: Completely free, forever.
- What you get: Your TransUnion score and full report.
- Website: creditkarma.co.uk
MSE Credit Club
- Free service: Completely free.
- What you get: Your Experian report and score, plus credit match tools.
- Website: mse.com/creditclub
Tip: Check all three services. Each uses a different agency, and your score can differ significantly between them. Lenders may check any of the three.
How to Improve Your Credit Score
Improving your credit score is not instant, but consistent good habits make a real difference over time.
1. Pay Every Bill on Time
This is the most important thing you can do. Set up direct debits for all regular payments — bills, credit cards, loan repayments. Even paying one day late can be recorded.
2. Keep Credit Utilisation Low
Aim to use less than 30% of your available credit. If possible, keep it below 10%.
- Pay off credit card balances in full each month.
- If you cannot pay in full, pay more than the minimum.
- Consider requesting a credit limit increase (but do not spend more).
3. Do Not Apply for Lots of Credit at Once
Each application leaves a mark on your file. Space out applications by at least three months.
- Use eligibility checkers before applying — these do a “soft search” that does not affect your score.
- Most credit card providers and comparison sites offer eligibility checkers.
4. Register on the Electoral Roll
Being registered to vote at your current address is one of the quickest ways to boost your score. It helps lenders verify your identity and address.
- Register at gov.uk/register-to-vote.
- It takes about five minutes and is completely free.
5. Keep Old Accounts Open
The longer your credit history, the better. Even if you do not use an old credit card, keeping it open can help.
- Close accounts only if they have high fees or tempt you to overspend.
6. Build a Credit History 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.
7. Correct Mistakes on Your Report
Check your report regularly for errors. Common mistakes include:
- Accounts that do not belong to you.
- Incorrect addresses or personal details.
- Debts that have been settled but still show as outstanding.
- Fraudulent accounts opened in your name.
If you find an error, contact the credit reference agency to dispute it. They must investigate within 28 days.
Credit Score Myths
There are several common misconceptions about credit scores that trip people up.
Myth: Checking your score affects it
False. Checking your own credit score is a “soft search” and does not affect your score at all. You can check it as often as you like.
Myth: Closing old accounts improves your score
Not necessarily. Closing old accounts can shorten your credit history and increase your utilisation ratio, which can actually lower your score.
Myth: You have one credit score
Incorrect. Each of the three credit reference agencies calculates a different score. Lenders may use any of them, or a combination.
Myth: 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, which can affect future applications.
Myth: Paying off a debt removes it from your file
No. Paid debts stay on your file for six years from the date they were registered. However, a settled debt looks much better than an outstanding one.
Myth: 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.
How Long Do Negative Marks Stay on Your File?
| Negative Mark | How Long It Stays |
|---|---|
| Missed payments | 6 years |
| County Court Judgments | 6 years |
| Bankruptcy | 6 years |
| Individual Voluntary Arrangements | 6 years |
| Hard credit searches | 2 years |
| Debt relief orders | 6 years |
After six years, most negative marks are removed from your file automatically.
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.
- Pay bills on time, keep utilisation low, and avoid multiple credit applications.
- Check your report regularly and correct any mistakes.