What is credit?
Credit is the ability to borrow money now and pay it back later. When a bank gives you a credit card with a $1,000 limit, they're extending you credit — they trust you'll pay it back. Your track record of repaying what you borrow is called your credit history, and it's summarized in a number called your credit score.
How credit scores work
The most widely used credit score is the FICO score, which ranges from 300 to 850. The higher the number, the better your credit. It's calculated from five factors:
- Payment history (35%): Do you pay on time? This is the biggest factor. One missed payment can drop your score significantly.
- Amounts owed (30%): How much of your available credit are you using? Keeping this below 30% (called your credit utilization ratio) is important.
- Length of credit history (15%): How long have you had credit accounts? Older accounts help your score.
- Credit mix (10%): Do you have different types of credit — credit cards, auto loans, student loans? Variety helps.
- New credit (10%): How recently did you apply for new credit? Multiple applications in a short time can hurt your score.
Why your credit score matters
A credit score isn't just about getting a credit card. It affects major life decisions:
- Whether you're approved for an apartment rental
- The interest rate you get on a car loan or mortgage
- Whether some employers will hire you (yes, some check credit)
- Insurance premiums in many states
The difference between a good and poor credit score on a 30-year mortgage can cost you tens of thousands of dollars in extra interest.
The real cost of debt
When you borrow money and pay interest, you end up paying back far more than you borrowed. Here's a concrete example: if you carry a $3,000 balance on a credit card with an 24% APR and only make the minimum payment each month, it could take over 10 years to pay off and cost you more than $4,000 in interest alone — more than you originally charged.
This is why high-interest debt is so dangerous. The interest compounds monthly, meaning you're paying interest on your interest.
Using credit cards wisely
Credit cards aren't inherently bad — used correctly, they're actually powerful financial tools:
- Pay the full balance every month: If you pay in full, you pay zero interest. The credit card company still makes money from merchant fees, and you get the rewards for free.
- Never miss a payment: Even one missed payment damages your score and triggers penalty fees and higher rates.
- Keep utilization below 30%: Don't max out your card. If your limit is $1,000, keep your balance below $300.
- Don't open too many cards at once: Each new application creates a "hard inquiry" that temporarily lowers your score.
Types of debt
Not all debt is created equal. Understanding the difference helps you prioritize what to pay off first:
| Type | Typical rate | Priority |
|---|---|---|
| Credit card debt | 18–30% APR | Pay off first — extremely expensive |
| Personal loans | 6–20% APR | High priority |
| Auto loans | 4–10% APR | Medium priority |
| Student loans | 3–7% APR | Lower priority if federal — flexible repayment |
| Mortgage | 3–8% APR | Lowest — building equity, tax-deductible |
How to build credit from scratch
If you have no credit history, you're not invisible — you just need to start. Options:
- Secured credit card: You deposit $200–$500 as collateral, and that becomes your credit limit. Use it for small purchases and pay it off monthly. After 6–12 months of on-time payments, your score will begin building.
- Become an authorized user: A parent or trusted person adds you to their credit card. Their positive history can help boost your score even if you never use the card.
- Credit-builder loans: Some banks and credit unions offer these specifically to help people build credit with small installment payments.
Key vocabulary
| Term | Definition |
|---|---|
| Credit score | A number (300–850) representing your creditworthiness |
| FICO score | The most widely used credit scoring model |
| APR | Annual Percentage Rate — the yearly cost of borrowing money |
| Credit utilization | The percentage of your available credit you're using |
| Hard inquiry | A credit check that can temporarily lower your score (triggered by loan applications) |
| Minimum payment | The smallest amount you can pay to avoid a late fee — but interest still accrues on the rest |
| Secured credit card | A card backed by a cash deposit — used to build credit |
| Debt-to-income ratio | Monthly debt payments divided by monthly income — lenders use this to judge affordability |