Guides · 6 Oct 2026 · 3 min read
How credit scores work: the 5 factors and how to improve yours
Your credit score affects what you pay to borrow, and sometimes whether you can rent a flat or get a phone contract. Here's what goes into it and the habits that improve it.
The short answer
A credit score is a number that estimates how likely you are to repay borrowed money, based on your credit report. In the widely used US FICO model (300–850), it's driven by payment history (about 35%), amounts owed and credit utilization (30%), length of credit history (15%), new credit (10%) and credit mix (10%). Paying on time and keeping balances low matter most.
Key takeaways
- Paying every bill on time is the single biggest factor.
- Keep credit card balances low relative to your limits.
- Older accounts help; closing old cards can lower your score.
- Check your credit reports regularly and dispute any errors.
Your credit score quietly shapes your financial life: the interest rate on a mortgage or car loan, whether a landlord accepts you, even some insurance prices. Understanding how credit scores work makes improving yours much more straightforward.
What is a credit score?
A credit score is a number that summarizes your credit report — the record of your borrowing and repayment history held by credit bureaus — into an estimate of how likely you are to repay.
In the United States, the most widely used models are FICO and VantageScore, both typically on a 300–850 scale. Other countries use different bureaus and scales (for example, UK agencies each use their own ranges), but the underlying principles are very similar.
What are the 5 factors in a credit score?
FICO publishes how much each category weighs for the general population:
| Factor | Weight | What it measures |
|---|---|---|
| Payment history | ~35% | Do you pay on time? Any late payments, defaults or collections? |
| Amounts owed | ~30% | How much you owe, especially credit card balances vs limits (utilization) |
| Length of credit history | ~15% | Age of your oldest and average accounts |
| New credit | ~10% | Recent applications and newly opened accounts |
| Credit mix | ~10% | Experience with different types, e.g. cards and installment loans |
Two factors — paying on time and keeping balances low — make up about two-thirds of the score.
Payment history
A single payment more than 30 days late can drop a good score noticeably, and serious problems such as defaults or collections hurt more. Setting up automatic minimum payments on every account is the simplest protection.
Credit utilization
Utilization is your card balances divided by your total card limits. If you have $10,000 of limits and $3,000 of balances, your utilization is 30%. Lower is better: many experts suggest staying under 30%, and people with the highest scores often use under 10%. Utilization is usually based on the balance reported each month, so paying down before the statement date can help.
Length of history
Older accounts show a longer track record. That’s why closing your oldest credit card can backfire: it can shorten your average history and reduce your total available credit, raising utilization.
New credit
Each application for credit usually triggers a hard inquiry, which can lower your score slightly for a period. Several applications in a short time can signal financial stress. When rate shopping for a mortgage or car loan, scoring models typically treat multiple inquiries within a short window as one.
Credit mix
Having managed both revolving credit (cards) and installment loans (car, student, mortgage) helps a little. It’s not worth taking out a loan just to improve your mix.
What is a good credit score?
On the FICO scale, approximate bands are:
| Score | Rating |
|---|---|
| 800–850 | Exceptional |
| 740–799 | Very good |
| 670–739 | Good |
| 580–669 | Fair |
| 300–579 | Poor |
Each lender decides its own cut-offs, so the same score can be treated differently by different lenders.
Credit score myths to ignore
- “Checking my score hurts it.” Checking your own score is a soft inquiry with no effect.
- “Carrying a balance builds credit.” Paying in full every month builds credit just as well and saves interest.
- “Income affects my score.” Income isn’t part of your credit score, although lenders consider it separately.
- “Closing cards helps.” Often it does the opposite.
How to improve your credit score
- Pay every bill on time, every month. Automate at least the minimum.
- Lower your utilization by paying down card balances. See debt avalanche vs snowball.
- Keep old accounts open if they have no annual fee.
- Apply for new credit sparingly.
- Check your reports for errors. In the US, you can get free reports from each of the three bureaus at AnnualCreditReport.com, and dispute mistakes directly with the bureau.
- Be patient. Negative items fade over time, and steady on-time payments steadily rebuild a score.
Why your credit score matters for your wallet
A better score generally means lower interest rates. On large loans like a mortgage, even a small rate difference can mean thousands over the life of the loan. Combined with a solid budget and an emergency fund, good credit gives you options when you need them.
The bottom line
Credit scores reward boring consistency: pay on time, keep balances low, don’t open accounts you don’t need and keep your oldest cards. Check your reports for errors once a year, and your score will take care of itself.
This article is general information, not personal financial advice. Scoring models and ranges vary by country and lender.
Frequently asked questions
What is a good credit score?
On the FICO scale of 300 to 850, scores in the 670–739 range are generally considered good, 740–799 very good and 800+ exceptional. Lenders set their own cut-offs, and other countries use different scales.
Does checking my own credit score lower it?
No. Checking your own score or report is a 'soft' inquiry and doesn't affect it. 'Hard' inquiries happen when you apply for credit and can lower your score slightly for a short time.
How long do late payments stay on a credit report?
In the US, most negative items, including late payments, can stay on your report for up to seven years, though their impact fades over time as you build a record of on-time payments.
How can I build credit from scratch?
Common routes include a secured credit card, becoming an authorized user on a responsible person's card, or a small credit-builder loan. Use it lightly and pay in full and on time every month.
Sources: Consumer Financial Protection Bureau — Credit reports and scores, AnnualCreditReport.com — Free official credit reports (US), myFICO — What's in your credit score
