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FICO Factors Explained: What Really Moves Your Score

FICO scores are built from five factors with published weights, but the weights are guidance, not formulas. Payment history at 35% and credit utilization inside the 30% Amounts Owed slot do most of the work. Here is what each factor measures, how big a swing it can produce, and the most actionable lever in each category.

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Five factors. Five weights. Most of the movement comes from two of them. That is the honest summary of how FICO scores work.

(https://www.myfico.com/credit-education/whats-in-your-credit-score) for the general population: payment history 35%, amounts owed 30%, length of credit history 15%, new credit 10%, credit mix 10%. The weights describe the average; for any individual the actual contribution depends on the composition of the credit file. A thin file is scored on a different scorecard than a thick one. This article walks through what each factor measures, the most actionable lever in each slot, and the size of the swing each one can produce.

The Five Factors at a Glance

Factor	Weight	Most actionable lever
Payment history	35%	On-time payments; bringing late accounts current
Amounts owed	30%	Revolving credit utilization (aggregate and per-card)
Length of credit history	15%	Keep the oldest card open and used occasionally
New credit	10%	Limit hard inquiries to ones you actually need
Credit mix	10%	Diversity across revolving + installment

Two notes on this table. The percentages are general — myFICO and (https://www.experian.com/blogs/ask-experian/credit-education/score-basics/what-affects-your-credit-scores/) both emphasize that the exact weighting depends on the individual file. And VantageScore — the alternative score developed by the bureaus — uses a similar but distinct breakdown. For most consumers FICO and VantageScore move together because they read the same underlying data.

Payment History — the 35% Slot

Payment history is by far the most important factor. It captures whether you have paid past credit obligations on time, plus the severity, frequency, and recency of any late payments.

The size of the swing here is large. Per myFICO's official guidance:

A single 30-day late payment can drop a score 60-110 points depending on the starting score and file thickness.
A 90-day late payment can drop 90-180 points.
A charge-off or collection registers as an active negative for 7 years from the date of first delinquency.

Recency matters more than age. A 30-day late from three months ago hurts more than one from three years ago, even though both stay on the report for 7 years. Bringing a delinquent account current does not erase the late notation, but it stops further damage and starts the recovery clock.

If you are working on payment-history damage, our (/post/how-long-do-late-payments-stay-on-a-credit-report) covers exactly when the negative entries drop off.

Amounts Owed — and the Credit Utilization Lever

The Amounts Owed category looks at how much you owe across accounts, but the dominant signal inside it is revolving credit utilization: the ratio of credit-card balance to credit-card limit, calculated both per-card and aggregate.

myFICO's utilization guidance provides the framing most lenders quote internally:

High-score profiles typically run under 10% aggregate utilization.
Utilization above 30% causes meaningful score drag.
Utilization above 50% causes substantial drag.

Two practical mechanics most consumers miss.

First, utilization is captured from the credit report at the time of scoring, not continuously. The balance the bureau receives depends on when in the statement cycle the lender reports. Paying a card down to under 10% just before the statement closes lets the lower balance get reported, instead of the peak. The next score pull sees that lower number.

Second, closing a credit card removes its limit from the utilization denominator. If you have two cards with $5,000 limits each, $1,000 total balance, and you close one, utilization jumps from 10% to 20% on the same balance. This is the most common source of an unexplained score drop.

The size of the utilization swing is meaningful: paying a high-balance card from 80% utilization down to under 10% can lift a score 20-40 points by the next reporting cycle.

Length of Credit History — 15%

Length looks at three sub-measures: the average age of accounts on file, the age of the oldest account, and the age of the newest account. Time since each account was used also matters — a card that hasn't been touched in years contributes less than one with recent activity.

The practical implications:

Keep the oldest credit card open and use it occasionally. Issuers close inactive cards, and closing the oldest card immediately shortens the average age of accounts.
Opening multiple new accounts in a short window drops the average age and also stacks hard inquiries (see next section).
An authorized-user tradeline on a parent's or partner's old card can lift the average age of accounts if the primary cardholder has a long history.

Length is a slow-moving factor. You cannot manufacture five years of history; you can only avoid actions that throw away the history you already have.

New Credit — the Hard Inquiry Math

The New Credit category captures recently opened accounts and recent hard inquiries — formal credit pulls done when you apply for credit.

A new hard inquiry typically drops a score 5-10 points and recovers within 6-12 months. Multiple inquiries for the same type of loan within a short window (the FICO "rate-shopping window" — typically 14-45 days depending on FICO version) count as a single inquiry. That window exists so that shopping for a mortgage or auto loan does not penalize you for comparing rates.

Soft inquiries — pre-approval offers, your own checks, employment screening — do not affect the score. Only hard inquiries from credit applications do.

Practical implications:

Apply for credit only when you actually need it.
Cluster mortgage or auto-loan shopping into the rate-shopping window.
A single hard inquiry is small. A pattern of inquiries — multiple unsecured cards within a month — looks like distress to the scoring model and amplifies the per-inquiry drag.

Credit Mix — Diversity Across Account Types

Credit mix rewards a file that contains both revolving accounts (credit cards, retail cards) and installment accounts (auto loan, student loan, personal loan, mortgage). Thin files with only one type are weighted lower.

For a typical consumer with several cards and at least one installment loan, this factor is mostly satisfied — there is rarely a reason to open a new account purely to improve credit mix. The cost of the inquiry and the average-age drop usually outweighs the small mix gain.

The factor matters most for two groups:

New-to-credit consumers with only one secured card. Adding a credit-builder installment loan (NFCC-affiliated lenders, your credit union, Self) provides a second account type and lifts the mix factor.
Mortgage-only consumers who paid off everything and have no active revolving. The score will drift down over time without a revolving tradeline reporting.

FICO Score Versions: Which Score the Lender Actually Pulls

The factor weights apply across FICO versions, but which version your lender pulls affects your apparent score and which actions move it.

Per myFICO's version guidance:

Mortgage lenders use FICO Score 2 (Experian), FICO Score 4 (TransUnion), and FICO Score 5 (Equifax) — the "classic" mortgage scores. These are older versions and treat collections differently than newer scores.
Auto lenders use FICO Auto Score 8 or 9.
Credit-card issuers typically use FICO Bankcard Score 8 or 9 or FICO Score 8/9.
Free credit-monitoring apps show FICO Score 8 most often, with VantageScore 3.0 or 4.0 the second most common.

The score you check on an app may differ by 10-40 points from the score the lender pulls. The difference is largest for mortgage scores because the classic versions weight medical collections and paid collections differently than FICO 8. Our (/post/tri-merge-credit-report-mortgage-explained) covers what mortgage lenders see across the three bureaus.

Frequently Asked Questions

What is the most important factor in a FICO score?

Payment history at 35%. A clean record of on-time payments produces the largest single contribution to a score. A 30-day late payment can drop the score 60-110 points depending on starting score and file thickness, and a 90-day late can drop 90-180 points. Recency matters more than age — recent lates hurt more than older ones, even though both stay on the report for 7 years from the date of first delinquency.

How much does credit utilization affect my FICO score?

Utilization is the most actionable single lever in the Amounts Owed category (30% of the score). High-score profiles typically run under 10% aggregate utilization. Paying a high-balance card from 80% down to under 10% can lift the score 20-40 points by the next reporting cycle. Closing a card removes its limit from the denominator and can spike utilization on remaining cards.

Why did my score drop after I closed a credit card?

Closing a card removes its credit limit from your aggregate utilization denominator and can shorten the average age of accounts if it was an old card. Both effects pull the score down. The fix is to leave older cards open even if you don't use them often — set a small recurring charge and autopay, so the issuer doesn't close the card for inactivity.

Does the FICO factor weighting apply to everyone equally?

No. myFICO and Experian both emphasize that the published percentages describe the general population. The actual weighting for any individual depends on the credit file — thin files with few accounts are scored on a different scorecard than thick files with long history. The most reliable practical strategy is to maintain on-time payments and low utilization; those two move the score regardless of file thickness.

The Bottom Line

The published FICO weights are a useful starting point, not a formula. For practical score management, two levers do most of the work — on-time payment history (35%) and revolving credit utilization inside Amounts Owed (30%). Length, new credit, and mix matter, but they're slower-moving and less actionable.

If you want to move your score in the next 30-60 days, the highest-leverage actions are paying every account on time and pulling revolving utilization under 10% before the statement closes. If you want to protect a high score, the most common mistake is closing an old card — keep it open, use it occasionally, and let the issuer keep reporting the limit and the age.