How Credit Scores Work and Why They Matter

One number that follows you everywhere

A commonly used FICO credit score is a three-digit number between 300 and 850 that estimates credit risk from report data. Lenders may use a score when deciding whether to offer credit and at what price; some landlords may use it in screening. Employers do not receive the score, although some may obtain a credit-related background report with written permission where the law allows.

One widely used model is the FICO score. FICO publishes five factor categories and approximate weights for the general population; the importance and effect of each category vary by individual credit profile:

Payment history (35%): Do you pay credit obligations on time? A late payment can hurt, but no fixed point loss applies to everyone.

Amounts owed / credit utilization (30%): How much of your revolving credit limit is reported as a balance? If a card reports a $900 balance against a $1,000 limit, its utilization is 90%. Lower utilization is generally better, but 30% is not a cliff, target, or guarantee.

Length of credit history (15%): How long have accounts been open, including the age of the oldest and newest accounts and the average age. More history can help evaluation, but a teen should not open an account merely to chase age; eligibility, fees, ability to pay, and actual need come first.

Credit mix (10%): The model considers experience with different account types. Do not borrow or pay interest merely to create a mix.

New credit (10%): Applications can create hard inquiries, and the category also considers newly opened accounts. The effect depends on the full file; no fixed point change or motive can be inferred from a particular number of applications.

Score ranges and what they mean

FICO publishes labels for commonly used base-score ranges: 800–850 Exceptional, 740–799 Very Good, 670–739 Good, 580–669 Fair, and below 580 Poor. These labels do not guarantee approval, denial, or a particular rate. Lenders choose models, cutoffs, and other underwriting criteria.

A stronger credit profile can qualify a borrower for a lower interest rate, but the dollar difference depends on the loan amount, term, rate offers, and market conditions. Compare actual loan estimates rather than relying on a generic lifetime-cost figure.

Why landlords and employers check credit

Landlords may use credit information, subject to applicable law, when assessing an application. Some employers may request a credit-related background report where the law permits. They must obtain written permission when using a background-reporting company, and the report does not include the credit score.

Checking your own credit does not hurt your score

A common misconception is that checking your credit damages it. Checking your own report is a "soft inquiry" and does not affect a credit score. A lender's credit check connected to an application may be a hard inquiry. Review your reports regularly and dispute inaccurate information.

Start early, benefit for decades

Your credit score is not just a score, it is a financial track record. The habits you build in the next few years become the foundation of that record. Pay on time, keep utilization low, and do not apply for credit you do not need. The compound effect of good credit habits built early is one of the clearest financial advantages available to teens.