Understanding the factors that affect your credit score

Your credit score influences the interest rates you’re offered, the credit limits you can access, and sometimes even non-lending decisions like rental approvals. But the number itself is only the surface, what matters is understanding the specific behaviors and data points that move it up or down.

This guide breaks down the major factors that affect your credit score, using recent, reputable sources and clear, practical explanations. Because different scoring models exist (notably FICO and VantageScore), you’ll also see where they align and where they weigh things differently.

1) The two big scoring families: FICO vs. VantageScore

Most consumers hear “credit score” as if there’s only one. In reality, lenders may use different scoring models, and the same person can have multiple scores depending on the model and the bureau data used. Experian notes that the FICO Score is used by “90% of top lenders,” which is one reason FICO factors get so much attention.

FICO publishes an official factor breakdown on its consumer education site, myFICO: payment history (35%), amounts owed (30%), length of credit history (15%), new credit (10%), and credit mix (10%). These are category weights, not a promise of exact point changes, but they describe what the model generally cares about most.

VantageScore 4.0 (a newer competing model) publishes a different set of factor weights: payment history 41%, depth of credit 20%, utilization 20%, recent credit 11%, balances 6%, and available credit 2%. Credit Karma (Intuit) highlights that VantageScore 4.0 vs. 3.0 keeps the same weights but shifts emphasis, placing higher emphasis on payment history and new credit and less on balances.

2) Payment history: the strongest predictor of future repayment

Payment history is typically the most important driver across models. myFICO uses explicit language: “payment history… is the strongest predictor” of whether someone will repay “as agreed.” That’s why missed payments can have a disproportionate impact compared with other missteps.

In practical terms, payment history reflects whether you pay on time, how often you pay late, and how severe the delinquency is (for example, 30 days late vs. 90+). VantageScore also emphasizes the role of recency and severity, late payments can remain on your credit reports for up to seven years, and their effect can diminish over time as they become older and you add more on-time payments.

Recent reporting underscores why this matters right now: Investopedia (citing FICO report coverage) noted that by April 2025, 3.1% of borrowers had a student-loan delinquency on record after policy changes. AP News also reported Gen Z’s average score fell 3 points to 676, with the resumption of student-loan delinquency reporting highlighted as a driver.

3) Amounts owed and utilization: it’s not just “how much debt”

FICO’s “amounts owed” category is often misunderstood as simply your total debt. myFICO explains it includes several related signals: your total balances, the number of accounts with balances, and, crucially, your revolving utilization.

Revolving utilization is the share of your available revolving credit (like credit cards and lines of credit) that you’re using. TransUnion defines credit utilization as revolving balances compared with total credit limits, and it notes that balances may take time to update on your credit report, so the timing of when a statement closes or when a lender reports can affect what your score “sees.”

Macro trends show why utilization has been in focus: Investopedia reported that as of April 2025, average U.S. credit utilization rose to 35.5% versus 29.6% in 2021, alongside an average score dip to 715 (from 717). Common improvement guidance aligns with these mechanics, many personal finance sources recommend keeping utilization low (often cited targets include 10% or 30%), because high utilization can signal higher risk even when you pay on time.

4) Length of credit history: age, averages, and account-specific context

“Length of credit history” is not just one number. myFICO explains it looks at the age of your oldest account, the age of your newest account, and your average account age. It can also consider account-specific age and use, which is one reason people sometimes see score changes after closing old accounts or opening new ones.

TransUnion similarly notes that a long-established credit history is generally positive, and it points consumers to the “Date Opened” field on accounts as the place to verify how old each tradeline is. If you’re trying to understand changes, checking those dates across your accounts can explain why your average age moved.

The key takeaway is that time is an asset in scoring. Keeping longstanding accounts in good standing can help demonstrate stability, while rapidly opening accounts can lower your average age, even if you never miss a payment.

5) New credit and hard inquiries: risk signals, but usually temporary

Opening several new accounts in a short time can look risky, and myFICO notes that “new credit” is part of the scoring picture. Hard inquiries, typically created when you apply for credit, are included here, along with the broader pattern of newly opened accounts.

myFICO states that hard inquiries can remain on your credit report for up to two years, but FICO Scores consider them for only the last 12 months. Consumer guidance often emphasizes that the impact is usually small and temporary; NerdWallet (updated Sep 11, 2025) describes hard inquiry effects as typically a modest, short-lived score drop and usually not impactful beyond roughly 12 months.

Rate-shopping is a major exception that borrowers should know. myFICO explains that newer FICO versions typically group multiple inquiries for certain loans (mortgage, auto, and student loans) within a 45-day window as a single inquiry for scoring purposes, while older versions may use a 14-day window. That means comparing offers can be smart, especially if you do it within the relevant window.

6) Credit mix and “depth”: why variety can help (but shouldn’t be forced)

FICO assigns 10% to “credit mix,” and TransUnion notes that having a variety of account types in good standing can be beneficial, such as credit cards (revolving) and installment loans (auto, mortgage, student loans). The logic is that successfully managing different types of obligations can be a positive signal.

VantageScore uses a slightly different label, “depth of credit” at 20%, which broadly reflects how established and robust your credit profile is. While the label differs, the practical theme is similar: a thicker, well-managed credit file tends to score better than a thin file with limited history.

That said, mix should be treated as an optimization factor, not a reason to borrow unnecessarily. Opening an account purely to “add mix” can backfire through new-account effects, inquiries, and the risk of missed payments.

7) What’s changing in credit reporting: medical debt and BNPL

Credit scoring isn’t static; it evolves with reporting rules, data availability, and policy. The Washington Post reported that a court voided a rule that would have removed certain medical debt from credit reports, creating uncertainty, while also noting that credit bureaus have voluntarily excluded unpaid medical debts under $500. If medical collections are a concern, the exact reporting treatment can materially affect a consumer’s file.

Another fast-moving area is buy-now-pay-later (BNPL). The Washington Post reported that FICO has planned updates (targeted for fall 2025) to incorporate BNPL data in newer scoring models, depending on how BNPL providers report and how widely the updated models are adopted by lenders.

The practical implication is that “new” types of borrowing can eventually influence traditional credit outcomes. Even before BNPL is broadly incorporated into scores, late payments or collections associated with any obligation can still show up through other reporting pathways, so treating all payments as credit-critical is a prudent habit.

8) How to monitor your credit factors safely (and spot problems early)

You can’t improve what you don’t measure, and credit reports are the raw material behind most scores. The Federal Trade Commission (FTC) states that AnnualCreditReport.com is the only authorized website for free official credit reports, and by law you can get one free report per bureau every 12 months.

TransUnion notes that your credit score is not included on the free weekly credit reports (when available), but reviewing the reports still helps you understand the drivers that scoring models use, like utilization, account age, and payment status, and helps you catch errors or signs of identity fraud.

It’s also important to avoid “free credit report” scams. Both the FTC and reporting in The Washington Post emphasize using AnnualCreditReport.com rather than searching the web for “free credit reports,” which can lead to lookalike sites, paid subscriptions, or misleading offers.

Understanding the factors that affect your credit score comes down to recognizing what the models reward: consistent on-time payments, low and well-managed revolving utilization, stable account age, and cautious use of new credit. FICO and VantageScore differ in weights, but they broadly agree on the fundamentals, especially that payment history is the biggest lever.

If you want the most reliable path forward, focus on mechanics that compound over time: automate on-time payments, keep utilization low, and regularly review your credit reports for accuracy. With consumer debt trends and reporting changes (from student-loan delinquencies to evolving medical debt and BNPL policies), staying informed is increasingly part of maintaining a strong score.