Credit Score Myths That Are Quietly Costing You Money
Carrying a small balance helps your score. Closing old cards is harmless. Checking your own credit hurts you. None of those are true — and believing them is expensive.
The credit scoring system is one of the most opaque and most consequential algorithms in your financial life. It decides what interest rate you get on a mortgage, whether you can rent the apartment you want, sometimes whether you get a job. The opacity has spawned a generation of half-true folk wisdom that sounds plausible, gets repeated at every dinner table, and quietly costs people real money.
Myth 1: Carrying a small balance helps your score
This is the single most damaging credit myth in circulation. It is completely false. The credit bureaus do not reward you for paying interest. What actually helps your score is using your credit cards regularly and paying the statement balance in full every month.
Myth 2: Closing old credit cards is harmless
Closing an old card does two things, both of which can lower your score. First, it reduces your total available credit, which raises your utilization ratio. Second, when the closed account eventually drops off your report, it shortens your average account age. If a card has no annual fee, keep it open.
Myth 3: Checking your own credit hurts your score
Checking your own credit is a "soft inquiry" and has zero effect on your score. You can pull your credit report from all three bureaus for free at AnnualCreditReport.com once a week. The only inquiries that affect your score are hard inquiries when you apply for new credit.
Myth 4: You need to be in debt to build credit
You need to use credit, not be in debt. Open a card. Run your normal spending through it. Pay the statement balance in full every month. You will never pay a cent of interest, and your credit score will climb just as fast as someone carrying a $5,000 balance — faster, actually.
Myth 5: Your score will tank if you pay off your mortgage or student loans
There is a small, temporary dip — usually 10–40 points — because closing an installment loan reduces your credit mix diversity. It recovers within a few months. Never delay paying off debt to protect a credit score.
Myth 6: Co-signing is "just helping out"
A co-signed loan is legally yours. Late payments hit your credit report. The full balance counts against your debt-to-income ratio. If the primary borrower stops paying, you are 100% on the hook.
Myth 7: Higher score = lower interest rate, in a smooth curve
Lenders use tiers. The difference between a 740 score and a 780 score on a mortgage is often zero — both fall in the same top tier. The difference between 719 and 720 can be substantial because those numbers sit on tier boundaries.
The five things that actually move your score
- Payment history (35%) — pay every bill on time, every time.
- Utilization (30%) — keep total balances under 30% of total limits; under 10% is better.
- Length of credit history (15%) — keep old accounts open.
- Credit mix (10%) — having both revolving and installment helps slightly.
- New credit (10%) — space out new applications.
Your credit score is the cheapest insurance policy you will ever own — but only if you stop paying premiums on advice that was never true.