Credit scores explained: what actually moves the number
Your credit score quietly determines what loans you qualify for and at what rate. Here's what actually moves it — and the myths that don't.
Written for plain-English understanding by Joseph Citizen. Why I built this →
Your credit score is a three-digit number (300–850 in the FICO model) that lenders use to predict how likely you are to pay back debt. Higher = lower risk = better rates. A 50-point difference can mean tens of thousands of dollars over the life of a mortgage.
What actually moves the score
- Payment history (35%) — paying every bill on time, every month. Single biggest factor.
- Credit utilization (30%) — how much of your available credit you're using. Keep below 30%, ideally below 10%.
- Length of credit history (15%) — older accounts help. Don't close your oldest credit card.
- Credit mix (10%) — having different types (cards, loans) helps slightly.
- New credit (10%) — opening many accounts quickly hurts temporarily.
Common myths
- Checking your own credit hurts your score — false. That's a 'soft pull' and has zero impact.
- Carrying a small balance helps your score — false. Pay it off in full every month.
- Income affects your credit score — false. Lenders see income separately, but it's not in the FICO formula.
- Closing credit cards helps — usually false. Closing reduces your available credit, hurting utilization.
Quick check on this lesson
Answer each question and we'll show you why the right answer is right — and why the others aren't.
- 1.
Which factor has the LARGEST weight in your FICO credit score?
- 2.
What's the 'utilization' rule of thumb for credit cards?
- 3.
Does checking your OWN credit score hurt your score?
0 of 3 answered
Keep the momentum going.
Paying off credit card debt: the highest-return investment you can make
Paying off a 22% APR credit card is mathematically equivalent to earning a guaranteed 22% return. Nothing else in finance comes close.
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Important
This lesson is general financial education only. It is not personal investment, tax, accounting, or legal advice. Examples are illustrative. Past performance does not guarantee future results.