Some of the Most Common Credit Score Advice Is Actually Working Against You

Credit scores sit at the center of a lot of major life decisions in the United States — mortgages, car loans, apartment applications, sometimes even job offers. So it makes sense that people take the advice around them seriously. The problem is that a meaningful chunk of that advice, repeated confidently across personal finance blogs, family dinner tables, and even some professional settings, is either outdated, misunderstood, or just flat-out wrong.

Worse, some of it actively hurts the scores people are trying to protect.

The 'Close Old Cards You Don't Use' Trap

This one gets repeated constantly, and it sounds responsible: if you have a credit card you haven't touched in years, close it. You're not using it, it might tempt overspending, and keeping old accounts feels messy.

In reality, closing that card can meaningfully damage your credit score — sometimes more than carrying a small balance would.

Here's why. About 30% of your FICO score is based on something called credit utilization, which is the ratio of your current balances to your total available credit. If you have $2,000 in balances across accounts with a combined $10,000 limit, your utilization is 20%. Close a card with a $3,000 limit that you're not using, and suddenly your available credit drops to $7,000. That same $2,000 balance now represents a 28.5% utilization rate — and you haven't changed your spending at all.

Another factor is credit age, which makes up around 15% of your score. Older accounts in good standing raise your average account age. Closing a card you've had for a decade removes that history from the active calculation.

The general rule that credit professionals actually follow: unless a card has an annual fee that's genuinely not worth paying, leaving old accounts open and occasionally using them for a small purchase is usually the smarter move.

'Never Carry Any Debt' Sounds Wise — And Isn't Quite Right

The instinct to avoid debt entirely is understandable, especially for anyone who grew up watching family members struggle with credit card interest. But FICO scoring models aren't measuring whether you're debt-free. They're measuring how responsibly you manage credit over time.

A person with no credit accounts and no debt doesn't have a perfect score — they often have no score at all, or a thin file that's difficult to work with when they actually need to borrow money. Lenders use credit scores to predict future behavior based on past patterns, and if there's no history to evaluate, there's nothing to score.

What FICO actually rewards is a track record of using credit and paying it back reliably. That means having accounts open, using them, and paying on time. Carrying a small balance isn't necessary — paying your statement balance in full each month is ideal for avoiding interest — but the idea that any credit usage is inherently dangerous misreads how the system works.

The Hard Inquiry Myth (And Why People Avoid Rate Shopping)

A lot of Americans are scared of hard credit inquiries — the kind that happen when you apply for a new card or loan. The concern is that each application dings your score, so people avoid shopping around for better rates on mortgages or auto loans to protect their numbers.

This fear leads to a real financial cost: accepting the first loan offer rather than comparing rates, potentially paying thousands more in interest over the life of a loan.

What most people don't realize is that FICO's scoring models treat multiple inquiries for the same type of loan within a short window — typically 14 to 45 days depending on the scoring version — as a single inquiry. The models are specifically designed to allow rate shopping without penalizing consumers for it. Checking rates from five mortgage lenders in two weeks is treated the same as checking one.

The fear is understandable, but it's costing people money.

Co-Signing Feels Helpful — And Carries Real Risk

Co-signing a loan for a family member or close friend is often framed as a generous, low-stakes gesture — you're just lending your good credit to help someone out, and as long as they pay, nothing changes for you.

In practice, that debt shows up on your credit report as if it's your own. It affects your utilization, your debt-to-income ratio, and your available credit for future borrowing. If the primary borrower misses a payment, your credit takes the hit. If they default entirely, you're legally on the hook for the full balance.

None of this means co-signing is always a bad idea. But the framing of it as a no-risk favor that lives entirely in someone else's credit file is a misconception that has genuinely blindsided people.

Why This Advice Persists

Most of these myths come from a kernel of real wisdom that got oversimplified. "Avoid unnecessary debt" is generally sound guidance that got flattened into "never use credit." "Don't open too many accounts at once" got stretched into "never apply for anything." The financial media rewards simple rules, and simple rules tend to lose nuance the more they get passed around.

FICO's actual scoring model rewards a long history, low utilization, on-time payments, a mix of account types, and limited new applications — in roughly that order of importance. Most of the common advice addresses these factors, just not always accurately.

The takeaway: Understanding the actual mechanics of how your credit score is calculated is worth more than any single rule you've heard repeated. The habits that build strong credit over time are less dramatic than most advice suggests — and a few of the most confident-sounding tips are the ones most worth questioning.