Credit scores explained: what actually moves yours
If you’ve ever obsessed over your credit score going up or down by a few points, here’s the twist: the number you’re staring at isn’t the one lenders use. Credit scores are one of the most misunderstood things in personal finance — so let’s clear up how they actually work, and what genuinely makes a difference.
This is information, not financial advice. It explains how credit reporting works in the UK. It doesn’t recommend any particular product or lender.
There isn’t one credit score
There are three credit reference agencies in the UK — Experian, Equifax and TransUnion — and each holds its own file on you. Each also gives you a “score”, but on a different scale, so the numbers aren’t comparable:
- Experian: 0–999
- TransUnion: 0–710
- Equifax: 0–1000
So you don’t have “a credit score” — you have at least three, and they’ll rarely match. That’s normal. What matters is roughly which band you’re in (poor, fair, good, excellent), not the exact figure.
And here’s the big one: when you apply for a card, loan or mortgage, the lender usually doesn’t see any of these numbers. They pull the raw information from your report and run it through their own scorecard, weighted for what they care about. A score that looks “excellent” on an app can still be turned down, and a “fair” one accepted. The consumer score is a useful guide to your trajectory — not a decision.
What actually moves your score
Behind all three agencies sits the same kind of data. These are the things that genuinely matter, roughly in order:
1. Payment history. Paying on time, every time, is the single biggest factor. One missed payment can do real damage; a run of them, or a default, can follow you for up to six years. Recent behaviour counts for more than old.
2. Credit utilisation. This is how much of your available credit you’re using. Maxing out a card looks risky; sitting well below your limit looks controlled. A common rule of thumb is to stay under 30% of your limit — lower is better. Because most lenders report your statement balance, paying a card down before the statement date can help even if you always clear it in full.
3. The electoral roll. Being registered to vote at your address is a quick, free way for lenders to confirm you are who you say you are and live where you say you do. Not being on it is a common, easily-fixed drag on your file. You can register even if you don’t vote.
4. Length and depth of history. A long track record of well-managed credit reassures lenders. This is why closing your oldest card can sometimes hurt — it shortens your history and cuts your available credit, pushing utilisation up.
5. Applications (hard searches). Every full application leaves a “hard” footprint. A few over time are fine; several in a short window can look like you’re desperate for credit. Use eligibility checkers (which do a “soft” search that only you can see) before applying for real.
6. Financial associations. A joint account or joint mortgage links your file to someone else’s, and their credit behaviour can affect your applications. If you split up, ask for a “notice of disassociation”.
The myths that waste people’s time
- “Checking my own score lowers it.” It doesn’t. Checking your own report is a soft search — invisible to lenders and harmless. Check as often as you like.
- “I earn more, so my score should be higher.” Your income isn’t on your credit report at all. Earning more doesn’t move your score directly (though it can help specific applications).
- “I’ve never borrowed, so I’ll have a great score.” Usually the opposite. A “thin file” gives lenders nothing to judge you on, which can make you harder to accept. A little well-managed credit beats none.
- “Closing cards I don’t use will help.” Often it does the reverse — you lose available credit and history. Sometimes worth doing to remove temptation, but it’s not a score booster.
- “There’s a blacklist.” There isn’t. Lenders just make their own decisions from your report.
How to see your report — for free
You’re entitled to see the information each agency holds. You can check all three at no cost:
- A statutory credit report is free from each agency directly.
- Free services also let you monitor your file: Experian’s free account (Experian data), ClearScore (Equifax data) and Credit Karma (TransUnion data), among others.
Checking all three matters because a mistake or sign of fraud might appear on one file but not another. If you spot something wrong — an account you don’t recognise, a payment marked late that wasn’t — you can dispute it with the agency, and they must investigate.
Building a stronger file, calmly
There’s no overnight fix, and anyone promising one for a fee should be treated with suspicion. The honest route is dull but reliable: pay on time, keep balances low, stay on the electoral roll, don’t apply for lots at once, and give it months, not days.
One practical lever is your credit-card balance. Paying only the minimum keeps your utilisation high and the debt hanging around for years. Paying more clears it faster and helps your file — you can see exactly how much faster with our calculator.
Try the credit card payoff calculator →
Last checked 23 July 2026. Score ranges are set by the agencies and occasionally change; the exact band boundaries matter far less than the habits above.
Sources
Just so you know: this guide is information and journalism, not financial advice, and we don't recommend specific financial products. Your circumstances are your own — if you need personal advice, speak to a suitably qualified adviser. Information was correct at the "last updated" date above but things change; always check the linked primary sources.