Forget everything you've heard from TikTok finance bros. Here's how your FICO score actually works — broken down by someone who stares at credit reports all day.
Hey, I'm Jess. Through working with credit reports, and the number one thing that trips people up? They don't understand which parts of their score matter most. They'll obsess over opening a new card (10% of your score) while ignoring a collections account (35% of your score). Let me walk you through what actually counts.
Spoiler: it's not about having zero debt. It's about how you manage what you owe.
The single biggest factor in your score
This is the heavyweight champion of credit scoring. Over a third of your FICO score comes down to one question: do you pay your bills on time? Every on-time payment is a small positive mark. Every late payment — especially 30, 60, or 90+ days late — is a hit that can significantly damage your score depending on your starting score.
Real example: A client came to us with a 620 score. She had one 90-day late payment on a mortgage from 2 years ago. We found the payment had actually been received on time — the servicer reported it late due to a processing error. After disputing with documentation, it was removed and her score jumped to 694. One item, 74 points.
Collections, charge-offs, bankruptcies, and foreclosures all fall under this category too. If you have a collections account reporting incorrectly — wrong balance, wrong dates, missing validation — that's exactly what our dispute process targets first.
How much of your available credit you're using
This isn't about the dollar amount you owe — it's about the percentage. If you have a $10,000 credit limit and carry a $3,000 balance, your utilization is 30%. FICO likes to see you under 30%, and under 10% is where you start looking really good. Over 50% and your score starts getting punished hard.
What most people get wrong: They close old credit cards they're not using. Bad move. That credit limit disappears, your total available credit drops, and your utilization percentage shoots up — even though you didn't spend a dime more. Keep old accounts open, even if you just use them for a small subscription once a month.
When creditors report incorrect balances — and it happens more than you'd think — it can inflate your utilization and tank your score. Our AI scans for balance discrepancies across all major credit bureaus and flags anything that doesn't match your actual statements.
How long your accounts have been open
FICO looks at the average age of all your accounts, the age of your oldest account, and the age of your newest account. Longer is better. This is why people always say "don't close your oldest credit card" — it anchors your average age up.
If you're young or new to credit, this factor works against you and there's not much you can do except be patient. But here's where it gets interesting for disputes: if an account is incorrectly reporting an open date that's newer than reality, it's dragging your average age down. We've caught creditors reporting the wrong account open date dozens of times. It's a Metro 2 field that gets botched regularly.
Jess tip: If someone offers to add you as an authorized user on their old credit card, that can give your average age a boost. But make sure their account is in good standing first — you inherit their payment history on that card too.
Recent applications and credit checks
Every time you apply for credit — a credit card, auto loan, mortgage — the lender pulls your report. That's a hard inquiry, and each one can ding your score by 5-10 points. They stay on your report for 2 years but only affect your score for about 12 months.
The myth that won't die: "Checking your own credit hurts your score." No. That's a soft inquiry. Soft inquiries are invisible to scoring models. Check your own credit as often as you want. What you shouldn't do is apply for 5 credit cards in one week — that tells FICO you might be desperate for credit.
Good news: rate shopping is protected. If you apply for the same type of loan (mortgage, auto, student) multiple times within a 14-45 day window, FICO counts all those inquiries as one. They know you're comparing rates, not desperately seeking credit.
The variety of accounts you carry
FICO likes seeing a healthy mix of account types — revolving credit (credit cards), installment loans (auto, personal, student), and mortgage debt. Having only one type isn't a dealbreaker, but showing you can manage different kinds of credit gives you a small edge.
Don't take out a loan just for the mix. This factor is only 10% of your score. It's not worth paying interest on a car loan you don't need just to have an installment account on your report. Focus on the big two — payment history and utilization — and the mix will take care of itself over time.
Nope. You build credit by having accounts and paying on time. Carrying a balance just costs you interest. Pay your statement balance in full every month.
Usually the opposite. Closing a card removes that credit limit from your utilization calculation and shortens your average account age. Keep them open.
Your salary, job title, and bank balance are not part of your FICO score at all. Someone making $40K can have a higher score than someone making $400K. It's all about how you manage credit.
Paying a collection doesn't remove it from your report — it just changes the status to "paid." The negative mark stays for 7 years. That's exactly why we focus on debt validation and disputing first.
Get a free credit analysis and I'll show you exactly which of these 5 factors are hurting your score — and what we can fix.
