Credit Scores Decoded: What Moves the Number and What Does Not

Credit scoring is deliberately opaque, which leaves room for a lot of folklore. Here is what the major scoring models actually weigh, and the myths that survive despite being wrong.

What moves the number

1. Payment history, the largest factor. One missed payment on a credit account can drop a good score materially and stays on file for years. Automate at least the minimum payment on everything.
2. Credit utilisation. The percentage of available credit you are using. Below 30% is the usual guidance; below 10% is better. This is measured at the statement date, so paying before the statement generates rather than before the due date is what lowers the reported figure.
3. Length of credit history. The average age of your accounts. This is why closing an old card can hurt: it removes history and available credit simultaneously.
4. Credit mix. Having both revolving credit and instalment loans handled well is mildly positive. Not worth taking on debt to engineer.
5. New applications. Each hard search leaves a mark. Several in a short window looks like distress, unless they are rate-shopping for the same product within a short window, which most models treat as one event.

What does not move it

• Checking your own score or report. That is a soft search. It is invisible to lenders and harmless.
• Your salary. Income is not on your credit file. Lenders ask separately.
• Your savings or investments. Also not on the file.
• Paying with a debit card, or using cash. No credit account, no data.
• Being in your overdraft occasionally, in most models, though sustained overdraft use can be visible and is read as pressure.

Fixing a damaged file

• Check all reports. Errors are common. Dispute anything wrong, in writing, with evidence.
• Prioritise getting current. Bringing a delinquent account up to date matters more than paying extra on a healthy one.
• Register on the electoral roll where applicable. It is one of the fastest legitimate improvements available in some countries.
• Consider a small credit-builder product if you have no file at all, and pay it off in full every month.
• Wait. Time genuinely heals credit files. Most negative markers age out on a fixed schedule and no company can accelerate that, whatever a repair advert claims.

The uncomfortable truth

A credit score measures how profitable and predictable you are as a borrower, not how responsible you are with money. Someone who never borrows can have a thin file and a mediocre score while being in excellent financial shape. Optimise the score when you are about to need credit, and otherwise do not let it drive your decisions.