Credit and debt shape nearly every major financial milestone, from renting an apartment to buying a home. A credit score is a three-digit number, typically ranging from 300 to 850, that summarizes creditworthiness based on factors such as payment history and credit utilization. Lenders use this score to assess the risk of lending money. Under the FICO model, payment history accounts for 35% of the score, amounts owed or credit utilization for 30%, length of credit history for 15%, new credit for 10%, and credit mix for the remaining 10%. Paying bills on time and keeping balances low relative to credit limits are the most reliable ways to maintain a strong score.
Not all debt is created equal. Good debt builds wealth or improves earning potential, such as a mortgage or a student loan for a marketable degree. Bad debt finances depreciating assets or pure consumption without producing returns, with high-interest credit card balances being the classic example. Because high-interest debt at 15-25% APR grows rapidly and consumes income, eliminating it first saves substantial money and frees up cash flow for saving and investing.
Credit cards allow borrowing up to a set limit for purchases, repaid monthly. Used responsibly, they build credit history and offer consumer protections, but carrying a balance triggers high interest charges. For people with poor or no credit history, secured credit cards require a cash deposit as collateral that sets the credit limit, allowing the cardholder to demonstrate responsible use while limiting the issuer's risk. Student loans, available through federal programs with fixed rates and forgiveness options or through private lenders with variable rates, fund education that can raise lifetime earnings.
For most households, the largest debt is a mortgage, a loan secured by real property repaid over 15 to 30 years and typically structured around principal, interest, taxes, and insurance (PITI). A down payment, usually 3% to 20% of the purchase price, reduces the loan amount, total interest, and the need for private mortgage insurance (PMI). PMI protects lenders on conventional loans with less than 20% down and costs roughly 0.5% to 1% of the loan annually until equity reaches 20%. Renting offers flexibility and lower upfront costs without maintenance responsibilities, while buying builds equity and offers tax benefits at the price of reduced mobility and exposure to market risk.