The 5 Factors That Determine Your Credit Score

Your credit score isn't a mystery — it's a calculation based on five specific categories of information drawn from your credit report. FICO, the scoring model used in over 90% of U.S. lending decisions, has publicly disclosed exactly what these five factors are and how much each one matters.

Understanding these five factors gives you a roadmap for improving your score. You'll know exactly where to focus your energy, which changes will have the biggest impact, and which factors simply require patience and time. Whether you're repairing your credit or building it from scratch, mastering these five factors is essential.

Understanding Credit Score Factors

The five FICO score factors, in order of importance, are:

1. Payment History — 35%
2. Credit Utilization (Amounts Owed) — 30%
3. Length of Credit History — 15%
4. Credit Mix — 10%
5. New Credit — 10%

Together, payment history and credit utilization account for 65% of your total score. This means the fastest and most impactful improvements come from paying bills on time and managing your credit card balances. The remaining 35% is divided among factors that are still important but take longer to influence.

Payment History (35%)

Payment history is the single most influential factor in your FICO score, accounting for more than a third of the total calculation. This factor tracks whether you've paid your credit obligations on time. It includes:

• Payment records on credit cards, retail accounts, installment loans, mortgages, and finance company accounts
• The severity of any delinquency (30 days late, 60 days late, 90 days late, 120+ days late, charge-off, or collection)
• How recently the late payment occurred — recent late payments hurt more than older ones
• How many accounts show late payments vs. how many total accounts you have
• Public records: bankruptcies, civil judgments (no longer reported as of 2017), and tax liens (no longer reported as of 2018)

How Late Payments Affect Your Score

The impact of a late payment depends on several factors. According to FICO data, a single 30-day late payment can cause the following approximate score drops:

• Starting score of 780: Drop of 90-110 points
• Starting score of 720: Drop of 60-80 points
• Starting score of 680: Drop of 40-60 points

The higher your score, the more a late payment hurts. This is because a late payment is more "out of character" for someone with an otherwise excellent history. The good news is that late payments become less impactful over time. A 30-day late payment from five years ago affects your score far less than one from five months ago.

Under the FCRA (Section 605, 15 U.S.C. § 1681c), late payments can remain on your credit report for up to 7 years from the date of the original delinquency. However, their impact on your score diminishes significantly well before they fall off. If a late payment on your report is inaccurate, you have the right to dispute it with the credit bureaus.

Credit Utilization (30%)

Credit utilization — also called your credit utilization ratio — measures how much of your available revolving credit you're currently using. It is calculated by dividing your total credit card balances by your total credit card limits. For example, if you have $3,000 in total balances across all cards and $10,000 in total credit limits, your utilization is 30%.

FICO considers utilization at two levels:

• Overall utilization: Your total balances divided by your total limits across all revolving accounts
• Per-card utilization: The utilization ratio on each individual card. Having one card maxed out even while your overall utilization is low can still hurt your score.

Utilization is a "snapshot" — it is calculated based on the balances reported to the credit bureaus at the time of your statement close date. This means you can lower your utilization (and potentially boost your score) quickly by paying down balances before your statement closing date. This makes utilization the fastest factor to change. Learn more in our detailed guide on credit utilization.

Optimal Utilization Levels

While the commonly cited advice is to keep utilization below 30%, research and score simulations reveal more nuance:

A counterintuitive finding is that 0% utilization (having open cards but never using them) actually scores slightly worse than 1-9% utilization. The scoring models want to see that you're actively using credit responsibly, not just sitting on open accounts.

Length of Credit History (15%)

The length of your credit history measures how long you've been using credit. FICO considers three metrics within this factor:

• Age of your oldest account: When your first credit account was opened
• Age of your newest account: When your most recently opened account was established
• Average age of all accounts: The mean age across every account on your report, including both open and closed accounts

This factor rewards patience. There are no shortcuts to building a long credit history — it simply takes time. This is why financial advisors often recommend that young people open a starter credit card early and keep it open for years, even if they don't use it often.

Closing old accounts can hurt this factor by eventually reducing your average account age. If you have a credit card with an annual fee that you no longer want, consider downgrading to a no-fee version from the same issuer rather than closing it outright. This preserves the account age while eliminating the fee.

Credit Mix (10%)

Credit mix evaluates the diversity of credit account types in your profile. The two main categories are:

• Revolving credit: Credit cards, home equity lines of credit (HELOCs), retail store cards — accounts with a credit limit that you can borrow against, repay, and borrow again
• Installment credit: Mortgages, auto loans, student loans, personal loans — accounts with a fixed loan amount, fixed payment schedule, and a defined payoff date

Having both revolving and installment accounts demonstrates that you can manage different types of credit responsibly. However, at only 10% of your score, this factor should never motivate you to take on debt you don't need. Don't open an auto loan just to improve your credit mix.

If you have only credit cards and want to diversify your credit mix without taking on major debt, consider a credit builder loan. These small loans (typically $300-$1,000) are designed specifically to help consumers build credit history and diversify their credit mix.

New Credit (10%)

The new credit factor looks at your recent credit-seeking activity. Opening several new accounts in a short period represents higher risk to lenders, especially for consumers who don't have a long credit history.

This factor considers:

• How many new accounts you've opened recently
• How many hard inquiries are on your report
• How long it's been since you opened a new account
• How long it's been since your last hard inquiry

How Hard Inquiries Work

A hard inquiry (or "hard pull") occurs when a lender checks your credit report as part of a lending decision — such as when you apply for a credit card, mortgage, auto loan, or personal loan. Each hard inquiry can lower your score by approximately 5-10 points, though the impact varies.

Important rules about hard inquiries:

• Rate shopping protection: FICO treats multiple inquiries for the same type of loan (mortgage, auto, or student) made within a 14-45 day window as a single inquiry. This allows you to shop for the best rate without being penalized for each application.
• Duration: Hard inquiries remain on your credit report for 2 years, but FICO only considers them for the first 12 months in its score calculation.
• Soft inquiries don't count: Checking your own credit, pre-qualification checks, and employer background checks are "soft inquiries" and have zero effect on your score. This is codified in the FCRA (Section 604, 15 U.S.C. § 1681b), which distinguishes between permissible purposes for credit pulls.
• Unauthorized inquiries can be disputed: If a hard inquiry appears on your report that you did not authorize, you can dispute it with the credit bureau. Under the FCRA, credit reports may only be accessed for permissible purposes.

Putting It All Together

Understanding these five factors reveals a clear strategy for credit improvement. Prioritize your efforts based on each factor's weight:

The most important takeaway is that the two factors you have the most direct, immediate control over — payment history and credit utilization — account for 65% of your score. Focusing on just these two areas can produce significant score improvements, even if the remaining factors aren't optimal.

For a broader understanding of how scores are calculated, including the differences between FICO and VantageScore, see our guide on how credit scores work.

Key Takeaways

Frequently Asked Questions