Only a handful of things actually move your credit score: whether you pay on time, how much of your credit limits you're using, how long you've had credit, how recently you've applied for new credit, and your mix of account types. For standard FICO scores, those are the major categories (other models weigh things a little differently). Your income, your rent (usually), checking your own score, and carrying a small balance are not on it, no matter how many times you've heard otherwise.
The five things that actually matter
Credit scores get treated like a mystery, but the recipe is public. In rough order of weight:
1. Payment history (the biggest factor by far). Do you pay at least the minimum by the due date? A payment 30+ days late can be reported and does real damage, and the later it gets (60, 90 days), the worse. One thing that surprises people: a payment a few days late usually never reaches your credit report. You may owe a late fee, but reporting generally starts at 30 days past due.
2. Credit utilization. How much of your available credit you're using, both per card and overall. High balances relative to limits drag scores down; the good news is most widely used scores respond primarily to your currently reported balance, so paying it down usually shows up within a cycle or two (some newer models also weigh balance trends over time).
3. Length of credit history. The age of your oldest account and the average age of all of them. This one only improves with patience.
4. New credit. Recent applications (hard inquiries) and newly opened accounts. Real, but small and temporary.
5. Credit mix. Having both revolving credit (cards) and installment credit (loans) helps a little. Not worth taking out a loan you don't need just to "improve your mix." The tail shouldn't wag the dog.
Things people think hurt their score (that don't)
- Checking your own score. Doesn't hurt. Never has. Check it daily if you want.
- Your income, savings, or job. Not in your credit file at all. A raise doesn't raise your score; a layoff doesn't lower it (only missed payments would).
- Paying your card in full every month. The "carry a small balance to build credit" advice is a myth that costs people interest for nothing. Paying in full builds the exact same on-time history, free.
- Getting denied for credit. The application (hard inquiry) has a small effect; the denial itself isn't recorded anywhere.
- Debit cards and prepaid cards. They don't report to bureaus; they can't hurt you, but they can't help you either.
- A bounced payment, by itself. An NSF fee is between you and your bank. Your credit is only involved if the bill goes 30+ days past due. (We cover this fully in "What happens if a payment fails?")
- Utility and phone bills paid on time. These usually aren't reported at all… which cuts both ways, because they can hurt you if they go unpaid long enough to hit collections.
Things people underestimate (that do hurt)
- One 30-day late payment. People with excellent scores have the most to lose: a single 30-day late payment can cause a substantial drop, especially on an otherwise strong file. This is why autopay for at least the minimum is the single best insurance policy in personal finance.
- Maxed-out cards, even paid in full monthly. If your balance reports high on your statement date, your utilization looks high, even if you never pay a cent of interest. Paying before the statement closes fixes the optics.
- Closing your oldest card. The immediate hit is usually to utilization: you lose that card's limit, which raises your ratio. A closed account in good standing commonly stays on your report for years and can keep counting toward your history length while it's there, so any age effect tends to come later, if and when it falls off, and it varies by scoring model. Fee-free old cards are often worth keeping open.
- Cosigning. Their loan is on your report. Their late payment is your late payment. Cosign only for someone whose bills you'd be willing to pay yourself. Legally, you've agreed to.
- Small forgotten debts going to collections. A $40 copay or a final utility bill at an old address can turn into a collection account. (Medical debt has real protections now: under the nationwide bureaus' current voluntary policy, paid medical collections are no longer listed, and unpaid ones with an initial reported balance under $500 generally shouldn't appear. Non-medical collections have no such floor, so "small" doesn't mean "safe.")
- Errors you never look for. Wrong balances, accounts that aren't yours, late marks that shouldn't be there. An error hurts your score exactly as much as the real thing would, until it's corrected.
The pattern behind all of it
Strip away the myths and the score is measuring two things: do you pay what you owe on time, and how much room do you have left. Everything else is a footnote. That's genuinely good news: no tricks to memorize, nothing to optimize daily. You need bills on autopay, balances with breathing room, and an occasional error check.
Where Solid Credit fits
That last item, errors, is the one nobody can manage by habit alone, because you can't fix a mistake you haven't seen. Solid's free tools read your credit report and flag what's actually dragging your score, so you're spending effort on the real factors instead of the folklore.
This article is for general information, not financial or legal advice.
Common questions
Does checking my own credit score hurt it?
No. Self-checks are soft inquiries and have zero effect on your score, ever.
Should I carry a balance on my credit card to build credit?
No. This is a myth. Paying in full builds identical payment history and costs nothing in interest.
Does my income affect my credit score?
No. Income isn't in your credit file. Lenders may ask about it on applications, but it doesn't factor into the score itself.
How much does one late payment hurt?
It varies, but a single 30-day late mark can cause a substantial drop, especially on an otherwise strong file. Its impact fades with time and on-time payments afterward.
Can errors on my credit report lower my score?
Yes. An error affects your score exactly like accurate information would, until it's disputed and corrected. Disputes are free by law.
