What Affects Your Credit Score? The 5 Factors Fully Explained

Your Credit Score Is Not a Mystery

Many people treat their credit score like a black box — it goes up, it goes down, and they are not sure why. But FICO scores are calculated using a transparent, published formula based on five factors. Once you understand each factor's weight and mechanics, you can predict score changes and take targeted action.

Factor 1: Payment History (35%)

The single most important factor. Payment history tracks whether you have paid past credit accounts on time — credit cards, mortgages, auto loans, student loans, and other accounts reported to the bureaus.

What helps:

• On-time payments every month, for every account
• Long history of perfect payments

What hurts:

• 30-day late payment: can drop score 50–100+ points
• 60-day late payment: worse, score drops 70–130+ points
• Collections, charge-offs, foreclosure, bankruptcy: severe and long-lasting damage

How long do late payments stay?

On your report for 7 years from the date of first delinquency. However, the impact decreases significantly after 2 years, and even more after 4 years, if you establish positive payment history in the meantime.

Key insight: A single missed payment from 5 years ago hurts your score much less than one from 6 months ago. Rebuilding payment history is about consistent on-time payments going forward.

Factor 2: Credit Utilization (30%)

The ratio of your credit card balances to your credit limits across all revolving accounts.

What helps:

• Utilization below 10% (ideal)
• Utilization below 30% (good)
• Each individual card below 30%

What hurts:

• Any card above 50% utilization
• Total utilization above 30%
• Maxed-out cards

Key insight: This factor resets monthly. Pay down a card before the statement closes, and your utilization improves in the next reporting cycle — one of the fastest ways to raise your score.

Full credit utilization deep dive →

Factor 3: Length of Credit History (15%)

Calculated from:

• Age of your oldest account
• Age of your newest account
• Average age of all accounts
• How long specific account types have been open

What helps:

• Keeping old accounts open, especially your first credit card
• Consistent use of older accounts

What hurts:

• Closing your oldest credit card
• Opening many new accounts quickly (lowers average age)

Key insight: This factor rewards patience. There is no shortcut — you can only build credit history by having accounts and letting time pass. Opening accounts as early as possible (even a secured card) is the best long-term play.

Factor 4: Credit Mix (10%)

Credit scoring models reward having experience with different types of credit: revolving credit (credit cards, lines of credit) and installment credit (auto loans, mortgages, student loans, personal loans).

What helps:

• Having at least one credit card AND one installment loan
• Successfully managing both types

What hurts:

• Only credit cards, no installment history
• Only installment loans, no revolving history

Key insight: Do not take out a loan just to improve your credit mix — the cost is not worth the benefit. But if you have only credit cards and need a personal loan or auto loan for another reason, the credit mix improvement is a nice side benefit.

Factor 5: New Credit (10%)

Each application for new credit triggers a "hard inquiry" on your report. Hard inquiries temporarily lower your score.

What hurts:

• Multiple applications within a short period (signals financial stress)
• Each hard inquiry: typically 5–10 points, temporary (1 year of impact)

What helps:

• Rate-shopping for mortgages, auto loans, or student loans within a 14–45 day window (counts as one inquiry)
• Letting inquiries age off naturally

Key insight: A single inquiry is very minor. The concern is multiple applications in quick succession. If you are applying for a mortgage, try to avoid opening new credit in the 3–6 months before applying.

The Factors That Do NOT Affect Your Score

Many people worry about things that have no impact:

• Checking your own credit (soft inquiry — no impact)
• Income or employment status
• Age, race, religion, or gender (illegal to use)
• Where you live
• Interest rates on your accounts
• Making minimum vs. full payments (as long as you pay on time)
• Debit card usage
• Bank account balances
• Utility and phone payments (unless in collections, or you add them via Experian Boost)

Building Your Score: Priority Order

If you want to improve your score efficiently, focus in this order:

1. Get on-time payments to 100% — autopay for minimums, manual payments for full balance
2. Reduce credit card utilization below 30%, targeting under 10%
3. Dispute any errors on your credit report
4. Keep old accounts open — especially your longest-held card
5. Avoid unnecessary hard inquiries

Frequently Asked Questions

Do all credit scores use the same formula? No. FICO and VantageScore are the two main models, and each has multiple versions. Lenders choose which model to use. Most use FICO, but the factors and weights are similar across all major models.

Why does my score differ between bureaus? Each bureau may have different information — not all creditors report to all three bureaus. Discrepancies are common and usually small.

Can my score change week to week? Yes. Credit scores are dynamic and recalculated each time a bureau is queried. A payment, balance change, or new account can shift your score quickly.