What is a credit score and how is it calculated?

Your credit report and credit score play a vital role in everyday life. Whether you’re applying for a mortgage, taking out a loan, signing up for a mobile contract, or even renting a flat, lenders will look at your score before saying yes.

But too few people know what a credit score really is, how it’s calculated, or why you actually have three different scores in the UK, not one.

This guide explains what a credit score is, how the main credit reference agencies (CRAs) calculate them, what counts as a “good” score in 2025, and how you can keep yours in healthy shape.

What is a credit score?

A credit score is a number designed to give lenders a snapshot of your financial reliability.

In the UK, there’s no single universal score. Instead, you have three different scores, one from each CRA: Experian, Equifax and TransUnion.

Each uses its own scale and scoring model, so your numbers will vary.

Why does this matter? Because a lender may check just one agency, or more than one, before making a decision.

That’s why it’s smart to keep track of all three.

Your score comes from your credit report, which records your borrowing and repayment history.

Every credit card payment, personal loan, mobile contract, or missed bill leaves a mark. With bank managers no longer making personal judgement calls, these reports are the standard way lenders decide if you’re a safe bet.

How is a credit score calculated?

Each CRA weighs information slightly differently, but the main factors are consistent.

• Personal information: Name, address history, whether you’re on the electoral roll, and sometimes employment details. These help confirm your identity and stability.
• Public records: Bankruptcies, IVAs, CCJs, or insolvency records. In the UK, most stay visible for six years.
• Payment history: Whether you’ve paid bills and debts on time. This is usually the most important factor.
• Credit utilisation: How much of your available credit you’re using. Staying below 30% is considered healthy.
• Type of credit: A mix of revolving (credit cards) and instalment (loans, mortgages) accounts in good standing shows responsible borrowing.
• New credit applications: Multiple applications in a short time can look risky.
• Length of credit history: Older accounts in good standing help your score.
• Hard enquiries: Each credit application leaves a mark for up to two years. Too many can drag down your score.

Each CRA combines these into a number, but lenders don’t just rely on your “consumer” score.

Many have their own in-house models. Your score is a guide, not the final word.

What is a good credit score?

Each CRA uses a different scale.

Here’s how “good” looks today:

(Source: Experian, Equifax, TransUnion, 2025 ranges)

As you can see, what counts as “good” depends on which CRA you’re checking.

Thankfully, most free tools like ClearScore (Equifax) and Credit Karma (TransUnion) show whether your score is poor, fair, good, or excellent.

Why does your credit score matter?

A strong score makes life easier and cheaper.

It affects:

• Mortgages: Better scores mean access to more lenders and lower rates.
• Loans and credit cards: Higher chances of approval and lower interest.
• Insurance: Some providers check your credit before offering monthly instalments.
• Renting: Landlords and letting agents may run a check.
• Utilities and mobile contracts: Providers want reassurance you’ll pay monthly bills.

Defaults, CCJs, or missed payments stay on your file for six years, so managing your score has long-term consequences.

How to check your credit score

The good news: you can check all three of your scores for free.

• ClearScore (Equifax data)
• Credit Karma (TransUnion data)
• Experian (via Experian’s own free account or CheckMyFile trial)

Checking your own score is a soft search, it won’t affect your score. It’s wise to check at least annually, if not quarterly, to spot errors or fraud.

How to improve your credit score

Improving your score is less about quick tricks and more about steady habits:

• Always pay on time: Even one late payment can damage your score.
• Keep utilisation low: Aim to use less than 30% of your available credit.
• Register on the electoral roll: It’s an easy boost.
• Avoid multiple applications at once: Space them out.
• Check your report for errors: Dispute anything incorrect.
• Consider a credit-builder card: Using it responsibly can help if your history is thin.

Common credit score myths (debunked)

• “I only have one score” – Wrong. You have three.
• “Checking my score lowers it” – Soft searches don’t affect your score.
• “Income affects my score” – Income isn’t recorded, but your repayment behaviour matters.
• “Flatmates affect my score” – Unless you share financial accounts, they don’t.
• “Scores never change” – Your score updates monthly as lenders report new data.

How credit scoring is changing in 2025

Globally, lenders are adopting more advanced models. In April 2025, VantageScore 5.0 was launched, using two years of trend data instead of just snapshots.

While VantageScore is mainly US-based, it shows the direction credit scoring is heading.

In the UK, Experian, Equifax, and TransUnion remain the standard, but lenders are increasingly blending traditional data with affordability and income checks.

Final thoughts

Credit scores may seem complicated, but they boil down to one thing, proving you can borrow responsibly.

Pay on time, borrow within your means, and check your reports regularly.

If your score isn’t perfect, don’t panic. With the right steps, most people can improve their rating in a matter of months.

Credit score FAQs

How long do missed payments stay on my credit file?
Missed or late payments can stay on your report for six years, although their impact reduces over time if you build a positive track record afterwards.

Does being on the electoral roll really help?
Yes. It makes verifying your identity easier, which can add points to your score. Not being registered is often seen as a red flag by lenders.

Can paying off a loan lower my score?
In some cases, closing an account can slightly lower your score because you lose a long-standing account or reduce available credit. Over the long term, paying debt responsibly is always positive.

What’s the difference between a soft and hard search?
A soft search (like checking your score) is invisible to lenders. A hard search (like a loan application) is recorded and may lower your score temporarily.

Is there a “magic number” for credit utilisation?
Yes. Staying below 30% of your available credit is considered healthy. Using more can make lenders think you’re over-reliant on credit.