Your credit score is a three-digit number that affects mortgage rates, credit card limits, mobile phone contracts, and sometimes even rental applications. Despite its importance, most people have only a vague understanding of how it works. This guide explains the mechanics, what actually moves the number, and the fastest ways to improve it.
What Is a Credit Score?
A credit score is a numerical summary of your credit history — a snapshot of how reliably you've managed debt in the past. Lenders use it (alongside other information) to assess how likely you are to repay future borrowing.
Higher score = lower perceived risk = better rates and higher approval chances.
UK Credit Scores
Unlike the US, the UK has no single universal score. Three main credit reference agencies (CRAs) each produce their own score:
| Agency | Score range | "Good" score | |--------|-------------|--------------| | Experian | 0–999 | 881–960 | | Equifax | 0–700 | 420–465 | | TransUnion | 0–710 | 566–603 |
The same person will have three different scores — not because the data is wrong, but because the agencies use different scoring models. Lenders typically check one or two agencies.
Free access: Experian (via their app), ClearScore (Equifax data), Credit Karma (TransUnion data). There is no need to pay for your credit report.
US Credit Scores (FICO)
The US has a more standardised system. FICO scores are used by over 90% of top lenders:
| Score range | Rating | |-------------|--------| | 800–850 | Exceptional | | 740–799 | Very Good | | 670–739 | Good | | 580–669 | Fair | | Below 580 | Poor |
VantageScore is an alternative model used by some lenders and free services, with the same 300–850 range.
What Makes Up Your Credit Score (FICO)
| Factor | Weight | What it means | |--------|--------|---------------| | Payment history | 35% | Have you paid on time? | | Amounts owed | 30% | How much of your credit limit are you using? | | Length of credit history | 15% | How old are your accounts? | | Credit mix | 10% | Do you have different types of credit? | | New credit | 10% | Have you applied for credit recently? |
The Most Important Factor: Payment History
Paying on time, every time, is the single most powerful thing you can do. A single missed payment — especially one that goes 90+ days overdue — can drop a good score by 50–110 points and remains on your file for 6 years (UK) or 7 years (US).
Practical action: Set up direct debits or autopay for at least the minimum payment on every account. Even if you pay in full manually, the direct debit is a safety net.
Credit Utilisation
Utilisation is how much of your available credit you're using. If you have a £5,000 credit card limit and carry a £2,500 balance, your utilisation is 50%.
Scoring models reward low utilisation. General guidance:
- Below 30% is good
- Below 10% is ideal
- 0% (never using credit) can actually be slightly suboptimal
Ways to lower utilisation:
- Pay balances before the statement date (not just the due date)
- Request a credit limit increase (without spending more)
- Open a new card (increases total available credit — but avoid this if it triggers a hard search at a bad time)
Hard vs Soft Searches
Soft search: Checking your own score, being pre-approved for offers, employer background checks. Does not affect your score. Visible only to you.
Hard search: A lender checking your credit when you apply for credit. Visible to other lenders. Leaves a footprint for 12 months (UK) or 2 years (US). Multiple hard searches in a short period signal financial stress.
Exception: Rate shopping for a mortgage or car loan — multiple hard searches within 14–45 days are typically counted as one inquiry by FICO.
UK-Specific Factors
Electoral roll: Being registered to vote at your current address is one of the quickest wins. Lenders use it to verify identity and stability. Register at gov.uk/register-to-vote.
Financial associations: If you've held a joint account with someone who has bad credit, you can apply to have a financial disassociation notice added to your file once the joint product is closed.
Default vs CCJ: A default stays for 6 years; a County Court Judgment (CCJ) also stays 6 years but has greater impact. Paying a CCJ within a month gets it removed from the register (though not the credit file).
How Long to Improve a Score
| Action | Typical timeframe | |--------|------------------| | Register on electoral roll | 1–2 months | | Clear missed payment and maintain perfect record | 3–6 months | | Lower utilisation below 30% | 1–2 statement cycles | | Negative marks age off (6 years UK / 7 years US) | Ongoing | | Build thin file with secured card | 6–12 months |
There are no genuine shortcuts. Services that promise fast score repair are typically offering things you can do yourself for free (disputing errors) or things that don't work (paying to "remove" accurate negative marks).
What Doesn't Affect Your Score
- Salary or income level
- Savings account balances
- Age (though older accounts help your credit history length)
- Checking your own score (soft search only)
- Utility bills (unless referred to a debt collector)
- Council tax (UK) — unless a CCJ results from non-payment
Common Myths
"Closing old credit cards improves your score." Usually the opposite — it reduces available credit (increasing utilisation) and shortens credit history length. Keep old accounts open and make small occasional purchases.
"You need to carry a balance to build credit." False and expensive. Paying in full each month builds credit just as well and costs nothing in interest.
"A poor credit score is permanent." No negative mark lasts forever. With consistent behaviour, most people can meaningfully improve their score within 12–24 months.
Use our Loan Calculator to see how different credit scores affect the interest rate — and therefore total cost — of borrowing.