Your credit score matters because it sets the price of nearly every dollar you borrow, decides whether landlords and mortgage lenders will approve you at all, and quietly shapes what you pay for insurance, utilities, and even some jobs. FICO scores run from 300 to 850, and the distance between a strong number and a weak one can cost tens of thousands of dollars over a lifetime in interest alone. That is before you count the deposits, the denials, and the doors that never open.
Lenders, insurers, and landlords generally sort borrowers into five tiers: exceptional (800–850), very good (740–799), good (670–739), fair (580–669), and poor (below 580). The exact number matters less than which tier you land in. Someone at 741 and someone at 789 usually see similar offers, but crossing from 669 to 670 can meaningfully change what is available to you.1myFICO. What Is a Credit Score
What a Low Score Costs You in Interest
Auto Loans
The spread between the best and worst auto rates is severe. In early 2025, a super-prime borrower (781 or above) averaged 5.18% on a new car loan. A deep-subprime borrower (below 500) faced 15.81%. On used cars the gap widens further, 6.82% versus 21.58%. On a $30,000 vehicle financed over five years, that difference works out to roughly $8,000 to $12,000 in extra interest depending on the exact terms.
Even a middle-of-the-pack score is expensive. A near-prime buyer (601–660) averaged 9.83% on a new car, nearly double the super-prime rate. That is about $50 more per month, which compounds into thousands over the loan.
Mortgages
Because mortgages are large and long, small rate differences turn into serious money. On a $350,000 30-year loan, a 740 score might lock in around 6.40% and roughly $1,751 per month. At 620, the floor many lenders accept for conventional loans, the rate could be 7.17% and the payment about $1,895. That $144 monthly difference adds up to more than $51,000 in extra interest over the life of the loan.
Credit Cards
Card APRs follow the same slope. Borrowers above 740 see averages near 11%. Borrowers in the fair range face rates closer to 25%. Carry a $5,000 balance at 25% instead of 11% and you are paying roughly $700 more a year in interest on that one card. This is where a low score feeds itself: high interest keeps balances up, high balances keep utilization up, and utilization drags the score down further.
Whether You Can Get a Home at All
Score does not just set your rate. It decides whether you are approved.
For FHA-insured mortgages, you need at least 580 to qualify for the standard 3.5% down payment. Between 500 and 579 you still qualify but must put down 10%. Below 500 you are ineligible.2U.S. Department of Housing and Urban Development. Does FHA Require a Minimum Credit Score and How Is It Determined Conventional loans have historically required 620, and while Fannie Mae’s automated underwriting no longer imposes a hard minimum, most lenders still treat 620 as a floor because their own risk rules have not moved.3Fannie Mae. General Requirements for Credit Scores
Rentals work the same way. Landlords pull credit to gauge whether you will pay on time, and a weak score can produce a flat denial no matter what your paycheck looks like. Some landlords will work around it with a co-signer or a larger deposit, but both carry their own costs.
Insurance, Utilities, and Phones
Most states let insurers use a “credit-based insurance score” when pricing auto and homeowners policies. The industry has found a correlation between lower credit scores and more claims, and prices accordingly. A poor score can add hundreds of dollars a year to the same coverage.
Seven states restrict or ban the practice: California, Hawaii, Maryland, Massachusetts, Michigan, Oregon, and Utah, though the details vary. California bans it outright for both auto and home. Maryland prohibits it for homeowners but allows limited use for new auto policies. If you live in one of those states, your score has less pull on your premiums.
Utilities check credit when you open service for electricity, gas, or water. Fall below the provider’s threshold and you can expect a security deposit of a few hundred dollars before they turn anything on. Mobile carriers use the same logic, which is why a weak score often means paying for the phone up front or landing on a prepaid plan.
Jobs
Employers in some industries — financial services, law enforcement, positions requiring security clearances — check credit as part of hiring. They are looking for signs of financial distress that could make a candidate vulnerable to coercion or dishonesty. Heavy debt, accounts in collections, and recent bankruptcies raise flags.
Federal law requires any employer to give you written disclosure and get your written permission before pulling your report.4Office of the Law Revision Counsel. 15 USC 1681b – Permissible Purposes of Consumer Reports You can refuse, but doing so may take you out of the running.
A growing number of states go further and restrict employment credit checks outright. California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Nevada, Oregon, Vermont, and Washington all limit the practice. New York joins that list statewide in April 2026, extending rules that previously applied only in New York City. In these states most employers simply cannot factor your credit into hiring, with narrow exceptions for roles involving financial trust or security responsibilities.
Credit Card Access
A strong score opens up unsecured cards with meaningful limits, rewards, and 0% introductory offers. Drop into fair or poor and those products disappear. What is left are secured cards, which require a cash deposit that usually becomes your credit limit. Most major secured cards need at least $200, though some start as low as $49. They typically charge no annual fee and report to all three bureaus, so responsible use rebuilds your score. The deposit comes back when you close the account in good standing or the issuer upgrades you.
Co-signing Someone Else’s Loan
Co-signing turns another person’s credit problem into yours. If the primary borrower stops paying, the lender does not have to try collecting from them first. It can come straight to you for the full amount, plus late fees and collection costs.5Consumer Advice (FTC). Cosigning a Loan FAQs Federal rules require lenders to hand every co-signer a “Notice to Cosigner” spelling this out before signing.6eCFR. 16 CFR 444.3 – Unfair or Deceptive Cosigner Practices
Even when the borrower pays on time, the debt appears on your credit report and counts against your debt-to-income ratio, which can block your own loan applications. Getting released is difficult: both the lender and the borrower have to agree, and the lender has little reason to give up an extra guarantor. Assume the obligation is permanent before you sign.
What You Can Do About Your Score
FICO weighs five factors, and two of them account for most of the score.7myFICO. What’s in Your Credit Score Payment history is 35%. A single 30-day late payment can drop a good score by 60 to 100 points. Amounts owed — how much of your available credit you are using — is another 30%. The standard advice is to keep utilization below 30%; the best scores sit under 10%. The remaining 35% comes from length of history (15%), new credit and hard inquiries (10%), and credit mix (10%).
Pay every bill on time and keep card balances low relative to your limits, and you are directly controlling 65% of your score. Those two habits move the number in the right direction even if you cannot change your history length or the types of accounts you have.
How Long Damage Lasts
Most negative marks — late payments, collections, charge-offs — stay on your report for seven years from the delinquency. Bankruptcies stay up to ten.8Consumer Financial Protection Bureau. How Long Does Information Stay on My Credit Report Their pull weakens over time; a late payment from six years ago costs you far less than one from six months ago. Positive information generally stays as long as the account is open, and closed accounts in good standing usually remain for about ten years, which is why keeping old cards open helps.
Checking and Fixing Your Reports
Equifax, Experian, and TransUnion each keep a separate report on you, and the information does not always match because they collect from different sources.9Federal Trade Commission (FTC). Free Credit Reports You can pull all three every week for free at AnnualCreditReport.com, a program the bureaus have made permanent. Equifax offers six additional free reports per year through 2026.
If you find an error — a payment marked late that was not, an account that isn’t yours, a wrong balance — dispute it directly with the bureau. It must investigate within 30 days and notify you of the results within five business days of finishing. That window can stretch to 45 days if you file after receiving your free annual report or submit added information mid-investigation.10Consumer Financial Protection Bureau. How Long Does It Take to Repair an Error on a Credit Report Errors do not fix themselves. Checking your reports at least once a year is the minimum, and catching a mistake early keeps it from silently costing you money on every loan, policy, and deposit for years.