What Is a Good Credit Score—and What Does It Unlock

Two people apply for the same mortgage on the same day. Same loan amount, same bank, same neighborhood. One walks out paying $200 less per month than the other—not because of income, not because of the down payment, but because of a number they built over years without thinking much about it.

That number is the credit score. The average FICO score in the US is 717—myFICO data. Most people with that score have no idea what it’s costing them compared to a score 40 points higher, or what it would take to get there.

What the Number Actually Measures

A credit score is a statistical prediction of how likely someone is to miss a payment in the next 24 months. Lenders use it to set prices, not just make decisions. The higher the score, the lower the predicted risk—and the lower the rate the lender charges to compensate for that risk.

FICO scores run from 300 to 850. The five tiers: Poor, Fair, Good, Very Good, and Exceptional. Most lenders don’t think in these labels—they think in rate buckets. A score of 739 and a score of 740 look identical to a person but land in different pricing tiers at most banks.

The score is calculated from five inputs. Payment history carries the most weight—35% of the total. Credit utilization is next at 30%. Length of credit history accounts for 15%. New credit applications and credit mix each contribute 10%.

The Five Inputs

Payment History: 35%

On-time payments build the score steadily. Late payments hit hard and stay on the report for seven years. A single 30-day late payment on an otherwise clean record can drop a score by 60 to 110 points—the higher the starting score, the larger the drop. FICO’s score research confirms that a missed payment is more damaging to an 800-score holder than to a 650-score holder, because the anomaly is greater.

Credit Utilization: 30%

Utilization is the percentage of available credit being used. Someone with a $10,000 credit limit carrying a $3,000 balance has 30% utilization. The scoring models prefer lower. Below 30% is the standard recommendation. Below 10% produces the best impact on this factor.

Utilization resets every month when card issuers report to the bureaus. Paying a balance down from 70% to 15% can show up in the score within 30 to 60 days—faster than any other factor can change.

Length of Credit History: 15%

The model tracks two things: how old the oldest account is, and the average age across all accounts. Older is better. This is why closing an old credit card—even one that isn’t being used—can lower the score. The average account age drops, and so does the score.

New Credit Applications: 10%

Each credit application triggers a hard inquiry that temporarily knocks the score by 5 to 10 points. The effect fades after about 12 months. FICO’s rate-shopping rule provides one exception: multiple mortgage or auto loan applications within a 14 to 45-day window count as a single inquiry. This lets borrowers shop rates without stacking penalty points.

Credit Mix: 10%

Having different types of credit demonstrates that the borrower handles multiple product types responsibly. The contribution is modest and not worth manufacturing debt just to diversify. It helps more as a tie-breaker than as a primary driver.

What Moving Up a Tier Actually Saves

On a Mortgage

The mortgage is where the score tier produces the largest lifetime dollar difference. The CFPB’s loan savings calculator shows that on a $300,000 30-year fixed mortgage, the difference between a 670 score and a 740 score can run 0.4 to 0.6 percentage points in rate. At 0.5 points, that’s about $90 per month—$32,400 over 30 years—on the same house, the same bank, and the same down payment.

Scores below 620 face a different problem entirely. Conventional loans aren’t available. FHA loans cover scores from 500 upward—HUD—but come with mandatory mortgage insurance premiums that add $100 to $200 per month to the payment. Crossing the 620 threshold removes that requirement and changes the effective rate comparison significantly.

On a Car Loan

Auto lenders sort borrowers into tiers with names that differ from FICO’s labels. Experian’s Q1 2024 automotive finance data shows the average new car loan rate for Super Prime borrowers (781+) at 5.08% vs. 11.53% for Subprime (501–600). On a $30,000 loan over 60 months, that gap costs roughly $3,200 in extra interest. For used cars, where loan rates run higher, the gap widens further.

On Credit Cards

Card issuers use the score to set both the APR and the credit limit on a new account. The Federal Reserve puts the average credit card rate at 21.47% across all accounts. But applicants above 740 frequently receive offers starting at 17 to 19%. Those below 670 often see 24 to 28%—if they’re approved at all. On a $6,000 balance, the difference between 18% and 26% is about $480 in annual interest.

Higher scores also unlock access to cards with better rewards programs. A 2% cash-back card with a $200 sign-up bonus typically requires a score above 700 to 720. At $20,000 in annual spending, that card returns $400 per year plus the bonus—before accounting for the lower APR if a balance is ever carried.

Score Tiers and Rates

*Approximate rates from myFICO loan savings data and Experian automotive data Q1 2024. Rates shift with market conditions.

The Fastest Ways to Raise the Score

Cut Utilization First

Utilization is the fastest-moving factor in the score. Paying down a card from $8,000 to $1,500 on a $10,000 limit drops utilization from 80% to 15%. That single change can produce a 30 to 50-point improvement within one billing cycle. It’s the highest-leverage move for anyone with balances.

Check the Report for Errors

The FTC found that 1 in 5 consumers has at least one error on a credit report. An error showing a late payment that didn’t happen, a balance that was paid years ago, or an account that belongs to someone else suppresses the score without cause. AnnualCreditReport.com gives free access to all three bureau reports. Dispute errors online—resolution typically takes 30 days.

Keep Old Cards Open

The account age factor rewards keeping accounts alive. An old card with a zero balance and no annual fee is earning score credit every month just by existing. Close it and the average age across all accounts falls—and the score tends to follow. The impulse to clean up unused accounts costs more than it saves.

Don’t Apply For New Credit Before a Major Loan

Each application adds a hard inquiry. The effect is small—5 to 10 points—but the timing matters. Applying for a new store card in the two months before a mortgage application adds an inquiry at the worst possible moment. Hold off on any new credit applications for at least six months before a planned major borrowing.

Bottom Line

The credit score is a pricing tool, not just a gate. It sets the rate on every loan for years. A score of 740 versus 670 on a 30-year mortgage is the difference of over $32,000. The inputs that build it are straightforward: pay on time, keep balances well below the credit limit, don’t close old accounts, and check the report once a year for errors that shouldn’t be there. None of it requires a high income. All of it requires consistency.

Disclaimer

This article is for informational purposes only and does not constitute financial advice. Credit score ranges and interest rates vary by lender and change with market conditions. Consult a licensed financial advisor before making major borrowing decisions.