credit

What Actually Hurts Your Credit Score (and What's Just a Myth)

By MoneyMattersDaily Editorial · Published August 23, 2026 · 5 min read

Most credit advice treats every mistake as equally damaging, but a FICO score is a weighted formula — some habits move the number a lot, others barely move it at all, and a few things people avoid out of caution don’t affect it whatsoever. Knowing the actual weights changes where it’s worth spending effort.

The five factors, ranked by weight

Payment history and utilization together are 65% of the score. That’s most of it, and both respond to the same two habits: pay on time, keep balances low relative to limits.

What actually hurts it

• A payment 30+ days late. This is the single worst common mistake — a 30-day-late payment can drop a score by 60–110 points and stays on the report for seven years. One late payment after a long clean history hurts less than the same late payment during an already-rocky stretch, but it’s never nothing.
• High utilization. Under 30% is the usual guideline, under 10% is where it stops dragging the score at all. This resets every billing cycle, so it’s the fastest-moving factor — a change shows up within about a month, in either direction.
• Closing your oldest card. This is a two-part hit: it shortens your average account age (length of history) and removes available credit, which raises utilization on whatever’s left — even if you never used the card. Almost always net-negative, even when the reason for closing it feels responsible.
• Applying for several credit products in a short window. Each hard inquiry is a small ding on its own, but a cluster of them close together reads to a scoring model as risk-seeking behavior, not comparison shopping — with one specific exception below.
• An unpaid medical collection over $500 that’s aged past the grace period. Medical debt gets real, specific protections most other debt doesn’t: paid medical collections are removed from reports regardless of amount, unpaid ones under $500 don’t appear at all, and there’s a 12-month grace period before an unpaid one can even show up. Past that window, an unpaid balance over $500 can still hurt like any other collection.

What doesn’t hurt it (common myths)

• Checking your own score. This is always a soft inquiry, no matter how often you do it. Zero effect, not “a small effect” — genuinely zero. For the full soft-vs-hard breakdown, see does checking your own credit score hurt it.
• Income. Not a scoring input at all. It matters to a lender deciding whether to approve you, but it isn’t part of the FICO calculation itself.
• Carrying a balance instead of paying in full. FICO doesn’t reward carrying debt — paying in full is simply better, with no upside to leaving a balance on purpose. This one costs real interest for no scoring benefit.
• Rate-shopping for a mortgage, auto loan, or student loan. Multiple hard inquiries for the same type of loan within a short window (typically 14–45 days, depending on the model) count as a single inquiry, not several. This is the exception to the “avoid multiple applications” rule above — it only applies to installment-loan shopping, not to opening several credit cards in the same window.
• Debit card activity. Debit cards aren’t reported to the credit bureaus at all. Spending responsibly on a debit card is good money management, but it’s invisible to your credit file no matter how it’s used.

Two newer factors worth knowing about

Credit scoring has picked up some real changes recently that didn’t exist a few years ago:

• Rent and utility reporting. Services like Experian Boost, RentTrack, and Esusu let you opt in to reporting on-time rent, utility, and even streaming payments to the bureaus. This mainly helps people with a thin or short credit file, since it adds positive payment history that wouldn’t otherwise exist on a report.
• Buy-now-pay-later (BNPL) reporting. BNPL plans are increasingly being reported to credit bureaus and can factor into a score like any other account — on-time payments can help build history, missed payments can hurt it. Worth treating a BNPL plan with the same seriousness as a credit card, not as a separate, lower-stakes category of debt.

Common mistakes people make trying to “fix” their score

• Closing a card to simplify finances, not realizing it can lower the score it was meant to help — see above.
• Avoiding all new credit out of fear, when the actual risk is clustering several applications together, not applying at all when a genuine need comes up.
• Ignoring a small medical bill, assuming it’s “too small to matter,” without checking whether it’s crossed the $500 threshold or the 12-month grace period.
• Confusing “no debt” with “good score.” A thin file with zero accounts doesn’t score well either — scoring requires reportable history to exist, so having no credit at all isn’t the safe default it sounds like. (See how to build credit from scratch if that’s the actual starting point.)

Where to check the real number

AnnualCreditReport.com provides free yearly reports from all three bureaus — Equifax, Experian, and TransUnion — and is the only site authorized by federal law for this, unlike many lookalike “free credit score” sites that exist to sell something else. Checking there doesn’t affect your score, per the myth above. If something on a report looks wrong, see how to dispute an error on your credit report.

Last updated August 2026. FICO factor weights and dollar thresholds referenced here reflect the current scoring model as of this writing and can shift over time — confirm current details directly with FICO, Experian, Equifax, or TransUnion before relying on any single figure, including these.