Credit scoring attracts more folklore than almost any other financial topic. Much of the advice passed around is wrong, and some of it costs real money to follow.
The models themselves are not secret. The factors and their approximate weights are published.
Two things dominate: paying on time and using a small share of your available credit. Together they drive most of the score. Pay every bill on time, keep balances well below your limits, and let accounts age. Almost everything else is noise — and carrying a balance to "build credit" is simply paying interest for nothing.
The factors, by weight
Exact formulas vary by country and provider, but the ranking is consistent:
| Factor | Roughly | What it means |
|---|---|---|
| Payment history | ~35% | Do you pay on time, every time |
| Amounts owed | ~30% | How much of your available credit is in use |
| Length of history | ~15% | How long accounts have been open |
| Credit mix | ~10% | Cards, loans, mortgage — variety |
| New credit | ~10% | Recent applications and new accounts |
The first two are about two-thirds of the outcome. Time spent on the other three is mostly time wasted.
Payment history
Nothing else comes close. A single missed payment that reaches the reporting threshold does more damage than years of careful optimisation elsewhere.
Practical implications:
- Automate the minimum payment on every account. You can always pay more manually — but the automatic payment means a busy month cannot turn into a missed one.
- The reporting threshold is usually a full billing cycle late, not one day. Paying a few days late is bad for fees, not usually for your score. Do not rely on this.
- Recency matters. A late payment from four months ago hurts much more than one from four years ago, even while both remain on file.
Utilisation — the one people get wrong
This is the share of your available credit you are actually using.
Two cards with a combined limit of 10,000 and a balance of 3,000 puts you at 30%.
Lower is better, and the effect is larger than most people expect. There is no official cliff, but scores generally improve as utilisation falls, with the biggest gains from getting well below a third.
Three things worth knowing:
It is calculated from your statement balance, not what you actually owe. If you spend heavily and pay in full every month, your reported utilisation can still look high — because the figure sent to the bureau is the balance on statement day. Paying down before the statement date, rather than by the due date, changes the reported number.
Raising a limit lowers utilisation instantly, with no change in behaviour. A limit increase on an account you handle well is one of the few genuinely free improvements available.
Closing a card raises utilisation, because you remove the limit but keep the debt. This is why "tidying up" old cards often backfires.
"You need to carry a balance to build credit." You do not. Paying in full every month builds credit exactly as well as carrying a balance — the account still reports as active and on time. The only difference is the interest. Following this advice costs money and buys nothing.
Things that do nothing
- Checking your own score. A soft enquiry, no effect, any number of times.
- Your income. Not in the score at all, though lenders consider it separately.
- Your savings balance. Not reported.
- Using a debit card. Not credit, not reported.
- Paying a utility bill on time, in most systems, unless you specifically opt into reporting.
Things that actively hurt
- Closing your oldest account. It eventually shortens your average history and removes its limit.
- Applying for several cards in a short window. Each hard enquiry costs a little, and a cluster suggests distress.
- Paying only the minimum indefinitely. Not a scoring penalty directly, but utilisation stays high and interest compounds against you.
- Letting a dispute go unpaid. A small bill sent to collections is one of the most damaging events on a report, and it usually involves an amount the person could easily have paid.
Building from nothing
If you have no history, the score is not low — it does not exist, which lenders treat with similar caution:
- A secured card or a starter account. You deposit an amount and it becomes your limit, so the risk to the lender is nil.
- Being added as an authorised user on a well-managed account belonging to someone who trusts you.
- Use it lightly and pay in full. A small monthly purchase, paid off, is all it takes.
- Then wait. Length of history is the one factor you cannot accelerate.
Twelve months of that produces a usable score. There is no faster route, and any service claiming otherwise is worth avoiding.
Checking your report
Separate from the score, and arguably more important: the report itself. Errors are common — accounts that are not yours, payments recorded as late that were not, debts already settled still showing open.
You are entitled to see your report, and in many countries to a free copy. Check it before any major application, not after a rejection. Disputing an error takes time you will not have once you need the credit.
This is general information, not financial advice — see our disclaimer.
Frequently asked questions
What matters most to a credit score?
Payment history, by a wide margin, followed by how much of your available credit you are using. Together those two account for the majority of most scoring models. Everything else is secondary.
Does checking my own score lower it?
No. Checking your own is a soft enquiry and has no effect. Only a hard enquiry, made when you apply for credit, can lower it slightly and temporarily.
Should I close a credit card I no longer use?
Often not. Closing it removes its available limit, which raises your utilisation percentage, and eventually shortens your average account age. Both push the score down.
Does carrying a balance help build credit?
No — this is the most expensive myth in personal finance. Paying in full builds credit exactly as well and costs nothing. Carrying a balance just pays interest for no benefit.
How long does negative information stay on file?
Typically several years depending on the country and the type of event. Its weight fades over time, so a late payment from four years ago matters far less than one from four months ago.
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