What’s the Most Important Factor of Your Credit Score?
Quick Answer
The most important factor of your credit score is payment history, making up 35% of your FICO Score.

You may know you have a credit score—and likely several scores—but do you know how your scores are calculated? Your credit score may seem like it's the result of a mystical mathematical formula, but the factors that go into calculating your credit score are pretty straightforward.
The most important factor of your FICO® ScoreΘ is your payment history, or how you've managed your credit accounts. Close behind is the amounts owed—and more specifically how much of your available credit you're using—on your credit accounts. The three other factors carry less weight. Here's what you need to know.
Payment History Is the Most Important Factor of Your Credit Score
Payment history accounts for 35% of your FICO® Score, used by 90% of top lenders. Four other factors that go into your credit score calculation make up the remaining 65%.
Keep in mind that there are as many as 40 versions of the FICO® Score, meaning you may have one score that's used to determine whether your credit card application is approved, another score for a mortgage application and yet another score for an auto loan application. When calculating these various scores, FICO weighs your payment history on your credit accounts most.
Why is payment history more important than the other factors? A lender wants to protect itself from risk. Therefore, it wants to know whether you've made timely payments on current and previous credit accounts. According to FICO, research shows payment history is typically the strongest predictor of whether you'll pay your debts on time, thus the heavier emphasis on this factor.
What Bills Affect My Payment History?
Several kinds of bills affect your payment history. These include:
- Credit cards, including Mastercard, Visa, American Express and Discover cards
- Retail credit cards from stores
- Installment loans, such as auto loans and mortgages, that involve making regular payments for a set term
- Accounts from finance companies
In addition to these accounts, FICO considers bankruptcies and collection accounts as part of payment history. Both can have a significant negative effect on your scores.
Bills from providers of phone, utility, cable TV and streaming services also may affect your payment history. In the past, these accounts would only impact your credit if they were sent to collections as a result of nonpayment, in which case they'd stay on your credit report for seven years and negatively affect your score.
Today, these accounts can actually help improve your FICO® Score, through Experian Boost®ø. With Experian Boost, you can allow Experian to securely access your online payment history for phone, utility, cable TV and certain streaming service providers. Then, on-time payments on authorized accounts will start showing up on your Experian credit report, and your FICO


