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Your FICO credit score is calculated from five factors pulled from your credit report. Each factor is weighted differently. Knowing the weights tells you exactly where to focus your effort to move your score the fastest. Here is how each factor works and what actually matters within each one.
Factor 1: Payment History (35%)
The single most important factor. It answers one question: have you paid your bills on time? Every on-time payment adds a positive data point. Every late payment adds a negative one.
Key details about payment history:
- A payment is considered late only once it is 30 days past due. A payment due on the 1st that you pay on the 25th is not reported as late — it is just a late fee from your card issuer.
- The severity matters. A 90-day late payment hurts significantly more than a 30-day late payment.
- Recency matters. A late payment from 5 years ago has less impact than one from 6 months ago.
- One late payment on an otherwise perfect history causes a significant drop — typically 60-110 points from a 700+ score. Multiple late payments compound the damage.
Single most important action: set up autopay for the minimum payment on every credit account. This prevents accidental late payments even in months when you forget.
Factor 2: Amounts Owed / Credit Utilization (30%)
The second most important factor. It measures how much of your available credit you are using. Calculated as total balances divided by total credit limits across all revolving accounts (credit cards and lines of credit).
The impact by utilization level:
- Under 10%: Excellent. Maximizes score in this category.
- 10-29%: Good. Minor negative impact.
- 30-49%: Moderate negative impact. Score begins to suffer.
- 50-74%: Significant negative impact.
- 75%+: Severe negative impact. Signals financial stress to scoring models.
Important: utilization is calculated both overall (all cards combined) and per card. A single maxed card hurts even if your overall utilization is low. Keep each individual card under 30% as well as your overall utilization.
Utilization is snapshot-based, not trailing. The number reported is your balance on the statement closing date, not your average over time. Pay down balances before the statement closes to report a lower utilization even if you pay in full monthly.
Factor 3: Length of Credit History (15%)
Measures three things: age of your oldest account, age of your newest account, and average age of all accounts. Older is better. A 10-year-old credit card contributes more positively to this factor than a 1-year-old card.
This is why you should never close old credit cards even if you do not use them. An old card with no balance and no annual fee silently boosts your score by keeping your average account age high. Closing it removes that history and can drop your score 10-50 points depending on your overall profile.
If you are new to credit, this factor works against you and there is no shortcut. Time is the only solution. But the impact of a thin credit history decreases as you build other positive factors.
Factor 4: Credit Mix (10%)
Scores slightly better if you have different types of credit: revolving credit (credit cards, lines of credit) and installment loans (mortgage, car loan, student loan, personal loan). Lenders like to see you can manage both types responsibly.
This factor is worth 10% and you should not take on debt specifically to improve credit mix. If you have only credit cards, do not get a car loan just to diversify. The 10% weight does not justify the cost and risk of an unnecessary loan. Let credit mix improve naturally as your financial life develops.
Factor 5: New Credit (10%)
Each new credit application triggers a hard inquiry on your credit report and temporarily drops your score by 5-10 points. Multiple hard inquiries in a short period signal risk. This factor also considers how recently you opened new accounts.
Exception: rate-shopping for a mortgage, car loan, or student loan within a 14-45 day window is treated as a single inquiry by FICO models. You can shop multiple lenders without multiple inquiry penalties if you do it within a concentrated timeframe.
Hard inquiry impact fades: the score impact diminishes after 6-12 months and the inquiry itself falls off your report after 2 years.
How to Move Each Factor
| Factor | Best Action | Timeframe to See Impact |
|---|---|---|
| Payment history (35%) | Set autopay, never miss a payment | Immediate prevention; 1-2 years to rebuild after a late payment |
| Utilization (30%) | Pay down balances before statement close | 1-2 billing cycles |
| Account age (15%) | Keep old accounts open | Years — no shortcut |
| Credit mix (10%) | Let develop naturally | Years |
| New credit (10%) | Limit applications, space them out | 6-12 months per inquiry |
The fastest score improvements come from paying down credit card balances (utilization) and catching up on any missed payments. Both can show results within 30-60 days.
Sources: FICO factor weights myfico.com; Experian credit utilization guidance; Consumer Financial Protection Bureau credit scoring education. This article is for informational purposes only.
