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Your Credit Score at 18 -- What It Is, Why It Matters, and How to Not Destroy It Before You Start

Nobody taught you this. Credit is one of the most consequential systems you'll interact with as an adult, and you're about to enter it at 18 with zero preparation. You'll be offered credit cards, car loans, store financing, and "buy now pay later" deals within weeks of your birthday, all by companies that profit when you don't understand how the system works. The people extending you credit are not doing you a favor. They're making a bet that you'll misuse it and pay them interest for years. Here it is.

Here's How It Works

A credit score is a number between 300 and 850 that represents how likely you are to pay back borrowed money. Lenders, landlords, insurance companies, and sometimes employers use this number to make decisions about you. A high score (generally 700+) means lower interest rates on loans, easier apartment applications, better insurance rates, and more options. A low score (below 580) means higher costs on everything that involves borrowing, difficulty renting an apartment, and limited financial flexibility. According to FICO, the company that created the most widely used scoring model, the median credit score in the U.S. is around 717. You don't start at 717. You start with no score at all, which in some ways is worse than a low one, because lenders have nothing to evaluate.

Your credit score is calculated from five factors, and knowing the weight of each one tells you exactly where to focus. Payment history makes up 35% of your score -- the single largest factor. This measures whether you pay your bills on time. One missed payment can drop your score significantly and stay on your credit report for seven years. Amounts owed accounts for 30% -- this is how much of your available credit you're using (called your credit utilization ratio). Length of credit history is 15% -- how long your accounts have been open. New credit is 10% -- how many new accounts you've recently applied for. Credit mix is 10% -- whether you have different types of credit (credit cards, loans, etc.). For someone just starting, the message is simple: pay on time, every time, and keep your balances low. Those two things control 65% of your score.

At 18, you have two main options for starting to build credit. The first is a secured credit card. With a secured card, you deposit money upfront -- typically $200-$500 -- and that deposit becomes your credit limit. If you deposit $300, your limit is $300. You use the card, you pay it off, and the card issuer reports your activity to the credit bureaus (Equifax, Experian, and TransUnion). It's training wheels for credit. Discover and Capital One both offer secured cards with no annual fees that eventually convert to regular unsecured cards once you've demonstrated responsible use. [VERIFY: current secured card offers and conversion policies at Discover and Capital One.]

The second option, if it's available to you, is becoming an authorized user on a responsible adult's credit card. When someone adds you as an authorized user, their account history for that card can appear on your credit report. If the primary cardholder has a long history of on-time payments and low utilization, that positive history benefits your score. This doesn't require you to ever use the card. But it requires a trusted adult with good credit habits, and not everyone has that. If you do, it's one of the fastest ways to build a credit foundation.

There's only one way to use a credit card responsibly at 18. Buy one small recurring expense on it each month -- gas, a streaming subscription, your phone bill. Pay the full statement balance before the due date. Never carry a balance from one month to the next. Treat the card as a debit card that reports to credit bureaus. The purpose of having it isn't to borrow money. The purpose is to generate a record of reliable payment behavior that builds your score over time. If you can't trust yourself to follow this rule, don't get the card yet. A nonexistent credit history is better than a damaged one.

The Mistakes Everyone Makes

The first mistake is opening a store credit card because the cashier offered you 15% off. Store credit cards -- the ones offered at checkout by retailers -- typically carry interest rates of 25-30% APR. According to the Federal Reserve's data on consumer credit, the average store card APR is significantly higher than the average general-purpose credit card. That 15% discount on a $50 purchase saves you $7.50. If you carry even a small balance on that card for a few months, the interest will eat that discount several times over. The math never works in your favor.

The second mistake is using "buy now, pay later" services like Afterpay, Klarna, or Affirm without understanding the consequences. These services split a purchase into installments and make spending money you don't have feel frictionless. They're marketed as free and easy, but missed payments can incur late fees, and an increasing number of BNPL services now report to credit bureaus. According to a CFPB report on BNPL lending, users of these services are more likely to carry credit card balances and show signs of financial distress than non-users. The product is designed to increase your spending, not to help you manage it.

The third mistake is only paying the minimum on a credit card balance. If you owe $500 on a credit card with a 24% APR and you pay only the minimum (typically $25 or 2% of the balance, whichever is greater), it will take you over five years to pay off and cost you more than $200 in interest -- on a $500 purchase. The credit card company is required to print this information on your statement. Read it. The minimum payment is designed to maximize the amount of interest you pay over time. It is the worst possible repayment strategy, and it's presented as the default option because it's the most profitable one for the lender.

The fourth mistake is checking your credit score on a site that charges you. You never need to pay to see your credit report or score. AnnualCreditReport.com gives you free access to your credit reports from all three bureaus. Credit Karma provides free credit score monitoring. Many banks and credit card companies now show your credit score in their app. The companies that charge for credit monitoring are selling you something you can get for free.

The Move

When you turn 18, check your credit report at AnnualCreditReport.com. Even if you've never had credit, it's worth checking because errors and identity theft can create records you didn't know existed. If someone opened an account using your Social Security number before you turned 18 -- and this happens more often than you'd think, including by family members -- you need to know about it now, not when you apply for your first apartment.

If your report is clean and empty, which is the most likely scenario, apply for a secured credit card. Put down the smallest deposit the card allows. Set up one small recurring charge on the card. Set up autopay for the full statement balance so you never miss a payment. Then forget about it. Let the card do its work quietly in the background while you focus on the rest of your financial foundation -- your emergency fund, your budget, your income.

If your report has errors or accounts you didn't open, you have the right to dispute them. File a dispute online through the credit bureau's website (Equifax, Experian, or TransUnion). The bureau has 30 days to investigate. If they can't verify the account, they must remove it. If you're dealing with identity theft, file a report at IdentityTheft.gov, which is the FTC's official resource.

Your credit score at 18 is not going to be impressive. It takes time to build history, and history length is 15% of your score. But the moves you make in the first two years -- paying on time, keeping utilization low, avoiding unnecessary hard inquiries -- set the trajectory. A 22-year-old with four years of perfect payment history and a score of 740 has access to financial options that a 22-year-old with two missed payments and a score of 580 simply doesn't. Both of them started at 18. The difference is what they did with those four years.

This is part 5 of the Money When You Have None series. Previous: The $500 Emergency Fund That Changes Your Entire Life | Next: Debt Is Not Normal

Related reading: Your First Paycheck Is a Lie | Compound Interest -- The Math That Makes Rich People Rich | How to Budget When Your Income Is Inconsistent