Credit Score Factors Explained: What Actually Goes Into Your FICO Score
AI-assisted drafting, human-reviewed and source-checked before publication — how we create content.
Your credit score isn't a mystery — it's a weighted formula. Knowing exactly what goes into it (and how much each input matters) lets you focus your effort on the moves that actually shift the number. This guide breaks down each FICO and VantageScore factor with realistic examples.
Payment history (35%)
The single biggest factor. A 30-day-late payment can drop your score an amount that varies by scoring model and credit file and stays on your report for 7 years. The good news: a single late after years of on-time payments hurts much less than chronic delinquency, and the impact fades over time.
Set autopay for at least the minimum on every account. The fastest way to lose an amount that varies by scoring model and credit file is to miss one payment by 30 days.
Credit utilization (30%)
Utilization is the percentage of your revolving credit you're using. Calculated per-card and overall. Under 30% is good; under 10% is excellent; 0% is slightly worse than 1–9% (the score wants to see you using credit responsibly, not avoiding it).
Utilization is the fastest-moving factor. It updates with each statement cycle, so changes show up in 30 days.
Length of credit history (15%)
Calculated from the age of your oldest account, your newest account, and the average age across all accounts. This is why closing your oldest credit card almost always hurts — even if you never use it.
If you have a thin file, becoming an authorized user on a parent's or spouse's well-aged account can add years of history to your report.
Credit mix (10%)
FICO rewards a mix of revolving credit (credit cards) and installment loans (mortgage, auto, student, personal). If you only have credit cards, adding a small credit-builder loan can produce an amount that varies by scoring model and credit file over a few months.
New credit / inquiries (10%)
Hard inquiries may affect certain credit scores, but the effect varies by scoring model and individual credit history. Multiple mortgage or auto loan inquiries within a 14–45 day window are bundled as one, so rate-shopping doesn't compound.
Soft inquiries (checking your own credit, pre-approval offers) don't affect your score at all.
FICO vs. VantageScore: how the factors compare
| Factor | FICO 8 Weight | VantageScore 4.0 Weight |
|---|---|---|
| Payment history | 35% | Extremely influential (~40%) |
| Credit utilization / total balances | 30% | Highly influential (~20%) |
| Length of credit history | 15% | Less influential (~21% combined with mix) |
| Credit mix & types | 10% | Highly influential |
| New credit / inquiries | 10% | Less influential (~5%) |
| Available credit | Not direct | Less influential (~3%) |
| Score range | 300–850 | 300–850 |
| Used by | Most lenders, all major mortgage | Free credit monitoring services |
Frequently asked questions
What to gather first
- A current copy of each credit report you want to review (Equifax, Experian, TransUnion) from AnnualCreditReport.com.
- Government-issued photo ID and proof of current address, which bureaus commonly request with a mailed dispute.
- Account statements, payment records, or letters that relate to the item you believe is inaccurate or incomplete.
- The exact account name, partial account number, and the reason you believe the entry is inaccurate or incomplete.
- A way to keep records: copies of what you send and, if mailing, proof of delivery.
Common mistakes to avoid
- Disputing information you know is accurate — that wastes the process and does not help you.
- Sending a vague dispute. Identify the specific item and explain what is inaccurate or incomplete.
- Disputing with only one bureau when the same entry appears on more than one report.
- Keeping no copies of what you sent, so you cannot show what was disputed or when.
- Paying a company that promises deletions or score increases — no one can promise those outcomes.
When to get additional help
Consider additional help if a bureau or furnisher does not respond, if an entry you believe is inaccurate stays on your report after a reinvestigation, if you may be affected by identity theft, or if you have questions about your legal rights.
- Submit a complaint to the Consumer Financial Protection Bureau.
- Report suspected identity theft at IdentityTheft.gov (FTC).
- For legal questions, consider consulting a licensed attorney in your state. This page is educational information, not legal advice.
How CreditKaren can help
CreditKaren is a free, AI-assisted tool that reviews a credit report you upload and highlights entries that may be inconsistent, incomplete, or worth a closer look. If you decide an item may be inaccurate or incomplete, CreditKaren can draft a dispute letter you can review, edit, and send yourself.
CreditKaren is not a law firm, credit bureau, lender, or credit-repair organization. It does not provide legal advice and does not guarantee deletions, dispute outcomes, or changes to your credit scores. You decide what to dispute and you send every letter.
Important limitation
Sources and further reading
Review your own credit report with CreditKaren
Use CreditKaren's AI-assisted educational tool to organize report entries you may want to investigate for accuracy. You review every result and decide whether to take action.
CreditKaren does not provide legal, financial, lending, or credit-repair advice. No dispute, deletion, score increase, approval, or other outcome is guaranteed.
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Nine evidence-based tactics to raise your credit score, ranked by impact and grounded in FICO and CFPB guidance — including utilization, dispute, and credit-mix moves.
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What May Change Quickly on a Credit Report—and What Often Takes More Time Realistic 7-day, 30-day, 60-day, and 6-month timelines for every legitimate credit repair tactic — grounded in FCRA law.
Who wrote this & how we work
This page is maintained by CreditKaren to answer common questions about the Fair Credit Reporting Act and our free AI-assisted educational credit report review tool. It reflects current practices in the app and is not legal or financial advice.
Written by the CreditKaren Editorial Team. Every guide references FCRA, FDCPA, and CROA statutes with links to the U.S. Code.
AI assists our drafting. Official sources are linked and verified, and a human on the editorial team reviews every page before publication.
How CreditKaren parses your report, which patterns count as FCRA §611/§623 violations, and why each dispute letter is generated.
Free, ad-supported, and independent — not a law firm and not a credit-repair organization under CROA. You review and mail every letter.
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