What Actually Affects Your Credit Score: Payment History, Utilization, and the Rest, Broken Down by Weight

The most common credit scoring model, FICO, weighs five factors: payment history (35%), amounts owed or credit utilization (30%), length of credit history (15%), new credit (10%), and credit mix (10%). Two of those five factors, payment history and utilization, account for nearly two-thirds of the score.

These percentages are general guidelines rather than a fixed formula applied identically to every profile. FICO itself notes that the weighting can shift slightly depending on an individual's overall credit file, someone with a short credit history, for example, may find new credit and credit mix carry relatively more weight simply because there's less payment history to draw on yet.

Quick answer: Payment history (35%) and credit utilization (30%) together make up 65% of a FICO score, meaning paying on time and keeping card balances low relative to their limits does more for your score than anything else on this list combined.

The five factors, ranked by weight

Factor	Weight	What it actually measures
Payment history	35%	Whether payments were made on time across all credit accounts
Credit utilization	30%	How much of your available credit is currently being used
Length of credit history	15%	Average age of accounts and age of the oldest account
New credit	10%	Recent hard inquiries and newly opened accounts
Credit mix	10%	Variety of account types, credit cards, installment loans, etc.

Payment history: the single biggest lever

A single payment 30 or more days late can drop a score by 60 to 110 points depending on how strong the score was beforehand, and the impact lingers for years even after the account is brought current, though it fades over time. There's no substitute for this one: automating at least the minimum payment on every account removes the single largest risk to a score.

The severity also scales with how late the payment is. A 30-day late payment hurts, but a 90-day or 120-day late payment, or an account sent to collections, causes substantially more damage and stays on a credit report for up to seven years. This is why, if money is tight in a given month, paying the minimum on every account rather than fully paying one and missing another entirely is almost always the better move for protecting the score.

Credit utilization: the fastest one to fix

Utilization is calculated both per card and across all cards combined, comparing the balance to the credit limit. Common guidance is to stay under 30% utilization, and under 10% for an excellent score. This is the factor with the fastest feedback loop, since paying down a balance can improve utilization, and the score, within a single billing cycle, unlike payment history which takes months or years to fully rebuild after damage.

Card limit	Balance	Utilization	Impact
$5,000	$4,200	84%	Significant negative impact
$5,000	$1,200	24%	Mild negative impact
$5,000	$400	8%	Minimal to no negative impact

Length of credit history: the one you can't rush

This factor rewards accounts that have been open a long time, which is why closing an old, unused credit card can actually hurt a score, even if the card isn't being used, by lowering the average account age. There's no shortcut here beyond time, though keeping old accounts open (as long as they don't carry an annual fee that isn't worth it) avoids actively working against yourself on this factor.

New credit and credit mix: smaller, but not nothing

A single hard inquiry from applying for a new card typically costs 5 to 10 points, usually recovered within a few months. Multiple applications in a short window compound this. Credit mix rewards having more than one type of account, for example a credit card and an auto loan, over having only credit cards, but it's a small enough factor that it's rarely worth opening a loan specifically to improve it.

What barely matters despite common assumptions

Income isn't a factor in the score itself, despite frequent confusion on this point, though lenders consider it separately when deciding whether to approve an application. Checking your own credit score, a soft inquiry, also has no impact on the score, unlike a hard inquiry from an actual credit application.

Debit card activity, bank account balances, and rent payments (unless specifically reported through a rent-reporting service) also don't factor into a standard credit score, another common point of confusion. Only accounts that are actually reported to the credit bureaus, credit cards, loans, and certain other credit accounts, have any influence on the number at all.

Frequently asked questions

How often does my credit score update? Typically monthly, as lenders report account activity to the credit bureaus, though the exact timing varies by lender and bureau.

Do all lenders use the same credit score? No, FICO scores are the most widely used, but VantageScore is another model with similar but not identical factor weightings, and different lenders may use different versions.

Where can I check my credit score factors for free? The Consumer Financial Protection Bureau has guidance on free credit report access and how to read what's affecting your specific score.

How long does it take to see a score improve after paying down a balance? Often within one billing cycle, since utilization is recalculated each time a lender reports the updated balance to the bureaus, typically once a month.

Where to focus first

If only two things get fixed, make them payment history and utilization, since together they're worth roughly two-thirds of the score. Everything else matters, but mostly at the margins.