The 5 FICO Score Factors Explained (With Weights and Action Steps)
Walk into any room of credit-curious consumers and ask what moves a FICO score, and you'll hear the same three answers: "pay your bills," "don't max out cards," and "don't open too many accounts." All three are technically right. All three are also a fraction of the picture — and the consumers who only know that fraction are usually the same ones stuck between 580 and 640 wondering why nothing they do seems to move the needle.
FICO is a five-factor model. The factors are public. The weights are public. What is not public is the precise algorithm — which is why you'll never see two posts agree on exactly how many points a 30-day late will cost you. But the framework is enough to make rational decisions. This guide walks through each of the five factors, what FICO actually measures inside them, what doesn't matter as much as people think, and — most importantly — which factor to attack first depending on where your score currently sits.
The 5 FICO Score Factors at a Glance
Every FICO score from 300 to 850 is built from these five components, in this order of weight:
| Factor | Weight | What It Measures |
|---|---|---|
| Payment History | 35% | Whether you've paid past accounts on time |
| Amounts Owed | 30% | How much credit you're using relative to your limits |
| Length of Credit History | 15% | How long your accounts have been open |
| New Credit | 10% | Recent applications and newly opened accounts |
| Credit Mix | 10% | The variety of account types you carry |
These weights apply to the general FICO model. Industry-specific scores — FICO Auto, FICO Bankcard, FICO Mortgage — reweight slightly, but the order rarely shifts. Payment history and amounts owed together represent 65% of your score. That alone tells you where to spend your energy.
Factor 1: Payment History (35%)
This is the largest single component and the one consumers underestimate the most. People assume "payment history" means "have you paid your bills." It actually measures three sub-dimensions: severity, recency, and frequency.
What Payment History Actually Counts
- Severity: A 30-day late hurts less than a 60-day late, which hurts less than a 90-day late, charge-off, collection, repossession, foreclosure, or bankruptcy. The scale is non-linear — a 90-day late can cost 60–110 points on a clean file.
- Recency: A 60-day late from last month is far more damaging than a 60-day late from four years ago. The penalty decays as the late ages, even though it stays on the report for seven years. To understand the timeline, see how long late payments stay on a credit report.
- Frequency: One late on one account is treated very differently from lates across three accounts in the same month. Pattern signals predict future risk more than any single missed payment.
What Moves Payment History Fastest
For files with recent lates, the highest-ROI move is preventing the next one. Set every revolving and installment account to autopay the minimum. The minimum is the floor that protects your score; pay the rest manually for utilization control. For files with charge-offs and collections, the path is disputing inaccurate reporting under FCRA § 611 — re-aged dates, incorrect balances, and unverifiable furnisher data are common. Our credit report dispute guide walks through the exact letter structure.
Watch Out
A single 30-day late on a file with no prior derogatories can cost a 780 score roughly 80–110 points. The same 30-day late on a file already carrying two collections might cost 20–40 points. FICO penalizes deviation from your established pattern — meaning the higher your score, the more it has to lose from a single misstep.
Factor 2: Amounts Owed (30%)
Most people read "amounts owed" and assume total debt. That's not quite it. FICO is measuring credit utilization — the ratio of revolving balances to revolving limits — far more than raw dollar totals. A consumer carrying $80,000 in mortgage debt and $300 on a $10,000 credit card has better utilization than someone with no mortgage and $4,800 on a $5,000 credit card.
The Two Utilization Numbers That Matter
- Aggregate utilization: Total revolving balances ÷ total revolving limits, across all open cards.
- Per-card utilization: The same calculation on each individual card. A single card maxed at 95% can drag the score even when aggregate utilization is fine.
FICO doesn't publish exact thresholds, but observed scoring breaks tend to cluster around 8.9%, 28.9%, 48.9%, 68.9%, and 88.9%. Crossing under one of those tiers — for example, paying a card from 31% to 28% — frequently triggers a measurable score lift on the next statement cycle. Our deep dive on credit utilization ratio covers the optimization math.
What Moves Amounts Owed Fastest
The fastest legal move on this factor is paying balances down before the statement closing date — not the due date. The balance reported to the bureaus is whatever was on the card when the statement cut, not what you eventually pay. A consumer who pays the statement balance in full every month but does it on the due date can still report 60%+ utilization to FICO if their spending runs close to the limit. Pay before the statement closes and the bureaus see a near-zero balance.
Factor 3: Length of Credit History (15%)
This factor measures three things: the age of your oldest account, the age of your newest account, and the average age across all accounts (sometimes called AAoA — average age of accounts). FICO rewards stability.
The painful truth about this factor is that you cannot rush it. Time is the only input. What you can do is avoid actions that destroy it — closing your oldest credit card, for example, eventually drops it off the report after ten years and your average age can collapse. The card that charges no annual fee and that you've held since college is often more valuable as a sleeping tradeline than as an active spending tool.
The Authorized User Lever
Adding yourself as an authorized user on a parent's or spouse's seasoned account can lift your average age by years overnight. FICO 8 and most legacy mortgage scores still factor authorized user accounts into length of history. The technique is legitimate when there is a genuine family relationship; piggybacking on a stranger's tradeline through a paid service is not — and lenders have algorithms that flag those patterns.
Factor 4: New Credit (10%)
Every time you apply for credit, the lender pulls a hard inquiry. FICO counts each hard inquiry for 12 months in the score calculation (though they remain visible on the report for 24 months). A single hard inquiry typically costs 2–5 points. The penalty stacks: six inquiries in 60 days signals distress and can cost 25–40 points.
There are two important exceptions. First, mortgage, auto, and student loan inquiries within a 45-day window are deduplicated into a single inquiry — rate shopping is not penalized. Second, soft pulls (checking your own credit, pre-approvals, account reviews) do not affect the score at all. For the full breakdown, read how hard inquiries affect your credit score.
Pro Tip
The "new accounts" sub-component of this factor is often more damaging than the inquiry itself. Opening a new credit card lowers your average age of accounts (Factor 3), creates a hard inquiry (Factor 4), and triggers a "new account" flag that suppresses your score for roughly 6–12 months while the account seasons. Plan account openings around major credit events — not the week before a mortgage application.
Factor 5: Credit Mix (10%)
FICO wants to see that you can responsibly manage different types of credit: revolving accounts (credit cards), installment loans (auto, student, personal), and ideally a mortgage. The tenth of your score allocated here is more about reassurance than reward.
Here's what nobody tells you: credit mix matters very little for established files. If you already have three credit cards, a paid-off auto loan, and a mortgage in your history, opening a personal loan to "diversify" will likely cost you more in inquiry and new-account penalties than the mix bonus will ever pay back. Mix only matters meaningfully for thin files — consumers with one or two accounts who genuinely need more variety to look like a real borrower.
Which Factor to Attack First Based on YOUR Situation
This is the question that actually matters. The right move depends entirely on what your file currently looks like.
| Your Situation | Attack First | Why |
|---|---|---|
| Rebuilding from recent lates or collections (sub-580) | Payment History | Stop the bleeding. Set autopay, dispute inaccuracies, pursue collection removal. |
| Climbing from fair (580–669) | Amounts Owed | Utilization moves the score the fastest at this tier. Pay before statement close. |
| Stuck in good (670–739) | Amounts Owed + New Credit | Push aggregate utilization under 9% and freeze new applications. |
| Optimizing past 750 | New Credit + Length of History | Don't open accounts. Don't close old ones. Hold the line. |
| Thin file (under 4 accounts) | Credit Mix + Length | Add a credit builder loan and a secured card; hold for 12+ months. |
This is also why generic advice fails. Telling a 780-scorer to "open a credit builder loan to diversify" is malpractice — it will cost them 20 points to chase a 5-point gain. Telling a 540-scorer to "pay your card to zero" while they have three open collections is rearranging deck chairs. Strategy has to match the file.
What Doesn't Move Your FICO Score
Equally important is knowing what FICO ignores entirely. None of the following factors affect your FICO score under federal law (ECOA, FCRA, and Reg B):
- Income. Your salary does not appear in your FICO calculation. Lenders use it for debt-to-income, but the score itself doesn't see it.
- Employment. Your job title and employer can appear on the report but are not scored inputs.
- Bank account balances. Checking and savings balances are not on the credit report.
- Marital status, age, race, national origin. Prohibited factors under ECOA.
- Rent payments (mostly). Unless reported to bureaus by a service like Experian Boost or a rent-reporting platform, rent doesn't count.
- Soft inquiries. Checking your own credit, pre-approvals, and existing creditor account reviews do not affect the score.
Consumers who obsess over getting a raise to "improve their credit" are aiming at the wrong target. The score doesn't see income. The lender does — but those are two different conversations.
The 30-Day Action Plan by Score Range
Pull all three reports at annualcreditreport.com and identify your tier. Then run the matching playbook for the next 30 days.
Under 580 (Poor)
- List every derogatory: late payments, charge-offs, collections, public records.
- Cross-check dates of first delinquency. Re-aging is rampant. See how to remove collections from a credit report.
- Set autopay on every open account, even minimum payments only.
- Open a secured credit card or credit builder loan if you have no positive open trades.
580–669 (Fair)
- Calculate per-card utilization on every revolving account.
- Pay the highest-utilization card down before its statement closing date.
- Freeze new applications for the next 12 months.
- Dispute any remaining inaccuracies on the report.
670–739 (Good)
- Target aggregate utilization under 9% and per-card under 28%.
- Request credit limit increases on existing cards (often soft pulls).
- Avoid opening anything new for 6+ months before any planned mortgage.
740+ (Very Good to Exceptional)
- Hold the line. Most score gains here cost time, not action.
- Keep your oldest accounts open and active with small recurring charges.
- Pull a mortgage-pull FICO before any major application to know your real number.
The single most common mistake at every score tier is reacting to the wrong factor. Sub-600 consumers obsess over utilization while ignoring collections. 700-scorers open store cards chasing rewards and tank their average account age. Match the move to the file.
Reading Your Report Like a Scorer
Once you understand the five factors, your credit report stops being a list of accounts and starts being a scoreboard. Each tradeline contributes to specific factors. Each derogatory tags a specific weakness. Each closed account is a future blow to length of history that hasn't landed yet.
If you've never actually read your report line-by-line, our walkthrough on how to read a credit report covers what each section means and which fields the bureaus most often get wrong. And if your file has a mix of disputable items and accurate negatives, understanding the difference between credit repair and credit restoration will save you months of effort on the wrong path.
The Bottom Line on FICO Factors
Five factors. Two of them (payment history and amounts owed) account for 65% of your score. The other three matter, but matter less, and matter differently depending on where your file currently sits. The consumers who move fastest are not the ones who memorize the percentages — they're the ones who diagnose their own file accurately and put their effort against the factor that actually has room to move.
Everything else — the credit card rewards optimization, the inquiry paranoia, the credit mix tinkering — is downstream of getting the big two right.