Your credit score is built from five main categories of information pulled from your credit report: payment history, amounts owed, length of credit history, new credit, and credit mix. Each category carries a different weight, and understanding how they interact gives you a practical roadmap for improving or protecting your score.
Payment History: 35% of Your Score
This is the single most influential factor. It tracks whether you’ve paid your bills on time across all your credit accounts, including credit cards, auto loans, mortgages, and student loans. A single late payment reported to the credit bureaus can drop your score significantly, and the damage increases the longer the payment goes unpaid. A 90-day late payment hurts more than a 30-day late, and accounts sent to collections or included in a bankruptcy carry the most weight.
The good news is that recent history matters more than older history. A missed payment from five years ago affects your score far less than one from last month. If you’ve had a rough stretch, consistent on-time payments over the following year or two will gradually rebuild this portion of your score.
Amounts Owed: 30% of Your Score
This category measures how much of your available credit you’re currently using, a concept known as credit utilization. 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 utilization both on individual cards and across all your revolving accounts combined.
Lower utilization signals that you’re not overly reliant on borrowed money. There’s no official cutoff, but borrowers with the highest scores tend to keep utilization in the single digits. Carrying a balance isn’t required to build credit. Paying your statement balance in full each month still generates a utilization ratio because your balance on the statement closing date is what typically gets reported to the bureaus.
Installment loan balances matter here too. Scoring models consider how much of your original loan amount you’ve paid down. A mortgage or auto loan where you’ve repaid a significant portion of the principal works in your favor compared to one you just opened.
Length of Credit History: 15%
This factor considers the age of your oldest account, the age of your newest account, and the average age across all your accounts. A longer track record gives lenders more data to evaluate, which is why closing an old credit card can sometimes lower your score. It also means that opening several new accounts in a short period drags down your average account age.
If you’re early in your credit journey, this category will naturally work against you. There’s no shortcut other than time. Keeping older accounts open and in good standing, even if you rarely use them, helps preserve the length of your history.
New Credit: 10%
Every time you apply for a credit card, loan, or mortgage, the lender pulls your credit report in what’s called a hard inquiry. Each hard inquiry typically costs you five to ten points. Hard inquiries stay on your credit report for up to two years, but FICO scores only factor in inquiries from the last 12 months.
There’s a built-in exception for rate shopping. If you’re comparing mortgage, auto loan, or student loan offers, multiple hard inquiries of the same loan type within a 45-day window count as a single inquiry. This means you can get quotes from several lenders without stacking up the damage. Older versions of the FICO model use a shorter 14-day window for rate shopping, so it’s wise to do your comparison shopping in a concentrated burst.
Not every credit check is a hard inquiry. Checking your own credit report, pre-approved credit card offers arriving in the mail, and employer background checks are all soft inquiries. Soft inquiries never affect your score.
Credit Mix: 10%
Scoring models like to see that you can manage different types of credit. Revolving accounts (credit cards, lines of credit) and installment accounts (mortgages, auto loans, student loans) behave differently, and handling both responsibly demonstrates broader financial capability. This doesn’t mean you should take out a loan you don’t need just to diversify your mix. The benefit is modest, and it only matters at the margins, typically when the rest of your profile is already strong.
How Newer Scoring Models Differ
The percentages above come from the traditional FICO model, which remains the most widely used score in lending decisions. But newer models are shifting the balance slightly.
VantageScore 4.0 gives even more weight to payment history at 41%, while splitting the “amounts owed” concept into separate categories: credit utilization (20%), balances (6%), and available credit (2%). Depth of credit accounts for 20%, and recent credit makes up 11%. The underlying principles are the same, but the emphasis differs.
FICO 10T, introduced in 2020, adds what’s called trended data. Instead of looking at a single snapshot of your balances, it analyzes at least 24 months of credit activity. Think of traditional scoring as a photograph of your finances at one moment, while FICO 10T is more like a time-lapse. If you put a vacation on a credit card in July and paid it off by September, the trended data model recognizes that pattern and penalizes you less than a model that happened to capture your balance at its peak. Borrowers who are steadily paying down debt benefit from trended data, while those whose balances are climbing will see a bigger score hit than under older models.
What Your Score Ignores
Several pieces of personal information that might seem relevant are explicitly excluded from credit score calculations. Your income, salary, job title, and employment history have zero impact. Your age, where you live, and whether you’re participating in credit counseling are all excluded as well. The interest rate on any of your accounts doesn’t factor in, nor do child or family support obligations.
Your score also ignores things that aren’t on your credit report in the first place. Rent payments, utility bills, and bank account balances don’t appear on most credit reports, so they typically don’t influence your score. Some newer programs allow you to opt in to have rent or utility payment data added to your report, but it’s not automatic.
Bankruptcies do appear on your credit report and affect your score, but other public records like tax liens and civil judgments were removed from credit reports in 2018 and no longer play a role.
Practical Priorities
Because payment history and amounts owed together account for 65% of a traditional FICO score, those two areas deliver the biggest return on effort. Setting up autopay for at least the minimum payment on every account protects the most important factor. Paying down credit card balances, or paying them in full each month, directly improves the second most important factor. Everything else matters, but those two moves cover the majority of your score.
If you’re building credit from scratch, a single credit card used lightly and paid on time each month will establish a payment history and utilization pattern. Over time, adding an installment loan when you naturally need one (like an auto loan) will round out your credit mix. The length of your history will take care of itself as long as you keep accounts open. And limiting new applications to the credit you actually need keeps inquiries low. The scoring formula rewards patience and consistency more than any clever strategy.