Your credit score is a three-digit number that lenders, landlords, insurers, and even some employers use to gauge your financial reliability. Whether you're applying for a mortgage, financing a car, or just trying to qualify for a better credit card, understanding what drives that number is the first step toward improving it.
Yet most people have only a vague idea of how their score is actually calculated.
So let me break down every factor, explain how FICO and VantageScore differ, debunk the most persistent myths, and give you a clear roadmap for where to focus your energy.
The Five FICO Score Factors
FICO scores are used in roughly 90% of lending decisions in the United States. They're built from five distinct categories of information found on your credit reports. Each category carries a different weight, and knowing those weights tells you exactly where to focus.
1. Payment History — 35%
Payment history is the single most influential factor in your FICO score. It's a full 35% of the total. The question it answers is simple: do you pay your bills on time?
Lenders view past behavior as the strongest predictor of future behavior, which is why even a single late payment can cause a major score drop.
Late payments are categorized by severity: 30 days late, 60 days, 90 days, 120 days, and charge-off or collection status. A payment that's 30 days late might reduce your score by 60 to 110 points depending on where you started, and the damage increases with each additional tier of delinquency.
Collections, charge-offs, bankruptcies, foreclosures, and judgments all fall under this category. They can linger on your report for seven to ten years.
The good news? The impact of a late payment diminishes over time. A late payment from four years ago hurts way less than one from four months ago. If you've got late payments dragging your score down, check out my guide on whether you can remove late payments from your credit report.
2. Credit Utilization — 30%
Credit utilization is the second most important factor at 30%. It's the ratio of your revolving balances to your total available credit limits.
If you have a credit card with a $10,000 limit and a $3,000 balance, your utilization on that card is 30%. Scoring models look at both per-card utilization and your aggregate utilization across all revolving accounts.
Most credit experts recommend keeping utilization below 30%, but people with the highest scores typically keep it under 10%. Going above 50% can cause steep score penalties.
And here's what trips people up: maxing out a card — even if you pay the full balance by the due date — can temporarily hurt your score because most issuers report balances on the statement closing date, not the payment due date.
For a deep dive into the math and strategies, see my full article on credit utilization ratio explained.
3. Length of Credit History — 15%
Length of credit history contributes 15% to your FICO score. This factor considers the age of your oldest account, the age of your newest account, and the average age of all your accounts.
A longer credit history gives scoring models more data to work with, which generally translates into a higher score — assuming the rest of your profile is solid.
This is why I always recommend keeping older accounts open even if you no longer use them actively. Closing your oldest credit card shortens your credit history and can also increase your overall utilization ratio by removing available credit.
Two hits for one action. Not worth it.
If you're just starting out, check out my guide on how to build credit from scratch for practical steps you can take today.
4. Credit Mix — 10%
Credit mix accounts for 10% of your score. Scoring models like to see that you can manage different types of credit responsibly.
There are two broad categories: revolving credit (credit cards, home equity lines of credit) and installment credit (auto loans, student loans, mortgages, personal loans).
Having a healthy mix of both signals to lenders that you can handle diverse financial obligations. But this doesn't mean you should take on debt you don't need just to diversify your profile. Credit mix is a relatively minor factor. The benefits of adding a new account type are usually modest compared to the potential risks of taking on unnecessary debt.
5. New Credit and Inquiries — 10%
The final 10% comes from new credit activity. Every time you apply for a credit card, loan, or line of credit, the lender performs a hard inquiry on your credit report.
Each hard inquiry can lower your score by a few points, and opening several new accounts in a short period can signal higher risk to lenders.
It's important to understand the difference between a hard inquiry and a soft inquiry. Hard inquiries occur when you formally apply for credit and can affect your score for up to 12 months. Soft inquiries — like checking your own score, employer background checks, or pre-qualification offers — don't affect your score at all.
For a thorough comparison, read hard inquiry vs. soft inquiry.
How VantageScore Differs
While FICO dominates lending decisions, VantageScore — developed jointly by Equifax, Experian, and TransUnion — is increasingly used by credit monitoring services and some lenders.
VantageScore doesn't publish exact percentage weights the way FICO does. Instead, it ranks factors by influence: payment history is listed as "extremely influential," utilization and balances as "highly influential," credit age and mix as "moderately influential," and new credit as "less influential."
One big difference? VantageScore's use of trended credit data. Rather than looking at a single snapshot of your balances, VantageScore 4.0 analyzes your payment patterns over time. A person who consistently pays down balances month over month is viewed more favorably than someone whose balances are growing — even if both have the same utilization at the moment of scoring.
VantageScore also scores people with thinner files more readily than FICO.
Common Credit Score Myths — Debunked
Let me clear up some misconceptions I hear constantly:
Myth 1: Checking your own credit score hurts it.
False. When you check your own score, it counts as a soft inquiry. Soft inquiries are never visible to lenders and have zero impact on your score.
Myth 2: Closing old credit cards improves your score.
In most cases, closing a card does the opposite. It removes that card's credit limit from your available credit total, which raises your utilization ratio.
Myth 3: Carrying a balance helps build credit.
You don't need to carry a balance and pay interest to build or maintain a good credit score. Paying your statement balance in full each month is the most cost-effective way to build credit. This myth drives me crazy because it costs people so much money in unnecessary interest.
Myth 4: Your income directly affects your credit score.
Your salary and net worth are not reported to the credit bureaus and are not factored into any credit scoring model. They might matter when you're applying for a loan (lenders look at debt-to-income ratio), but they don't affect your score itself.
Which Actions Have the Biggest Impact
If you want to improve your credit score, here's where I'd focus:
- Make every payment on time. Since payment history is 35% of your score, even one missed payment can be devastating. Set up autopay for at least the minimum due on every account.
- Pay down revolving balances aggressively. Reducing your credit utilization from 60% to under 10% can produce a score jump of 50 points or more within a single billing cycle. This is the fastest score boost you can get.
- Dispute inaccurate negative items. Errors on credit reports are more common than most people realize. Learn how our process works for professional help.
- Keep old accounts open. Closing a long-standing credit card shortens your credit history and reduces available credit. You're potentially hurting two factors at once.
- Limit new applications. Space out credit applications and only apply when you genuinely need new credit.
Here's the key insight: 65% of your FICO score comes from just two factors — payment history and utilization. If you can master those two areas, you've already won the majority of the battle.
Focus there first. Everything else is secondary.