How to Build Credit at 18 Without Getting Into Debt
Under 21 you need your own income or a cosigner for a credit card. Safe beginner ways to build credit at 18, what your score is made of, and how to avoid debt.
In this guide
Credit sounds like a grown-up problem for later. But your credit history is what landlords, phone companies, car lenders and sometimes employers look at, and it starts the first time you borrow. Start right at 18 and by your early 20s you’ll have a solid score without ever paying a cent of interest.
Here’s how credit works, the safest ways to start, and the mistakes to avoid.
What a credit score is made of
A credit score is a number that tells lenders how likely you are to pay back what you borrow. The most common one, the FICO Score, is built from five parts. According to myFICO:
| Factor | Weight | In plain English |
|---|---|---|
| Payment history | 35% | Do you pay on time? |
| Amounts owed | 30% | How much of your available credit are you using? |
| Length of credit history | 15% | How long have you had credit? |
| New credit | 10% | Have you opened lots of accounts recently? |
| Credit mix | 10% | Different types, like cards and loans |
The takeaway: paying on time and not using too much of your limit make up two-thirds of your score. That’s good news, because both are completely in your control.
The under-21 rule
Turning 18 doesn’t mean any bank will hand you a credit card. A federal law, the Credit CARD Act, says that if you’re under 21, a card issuer can only open a credit card for you if you either show your own independent income to pay it back, or have a cosigner who is 21 or older and agrees to be responsible for the debt (15 U.S.C. 1637(c)(8)).
A part-time job counts as income. Your parents’ income generally doesn’t, unless they cosign.
5 ways to start building credit
1. Become an authorized user
A parent adds you to their credit card. You get a card with your name, but they’re responsible for the bill. If the card company reports authorized users to the credit bureaus, the account’s history can show up on your credit report.
The catch, according to the Consumer Financial Protection Bureau (CFPB): not all card issuers report authorized users, and if anyone on the account misses payments or maxes it out, it can hurt everyone’s credit. Only do this with a parent who pays on time.
2. Get a secured credit card
You put down a deposit, and that becomes your credit limit. The CFPB says deposits can range from $50 to $300. You use it like a normal card and pay it off, and many secured cards “graduate” to a regular card after a stretch of on-time payments. Ask the issuer if it reports to the credit bureaus, or it won’t help.
3. Try a credit builder loan
Offered mostly by credit unions. The CFPB explains that the lender puts a small “loan”, often $300 to $1,000, into a locked savings account. You pay it back in small amounts over 6 to 24 months, your payments get reported, and at the end you get the money. You’re basically saving while building credit.
4. A student credit card
Some cards are made for students with little or no history. They usually have low limits. Remember the under-21 rule: you’ll need your own income or a cosigner.
5. A store card (carefully)
The CFPB notes that store cards tend to be easier to get and have lower limits. Check the interest rate before you apply, and only use one if you’ll pay it off in full every month.
The habits that build great credit
- Pay the full balance every month. You build history and pay zero interest.
- Never miss a payment. Set up autopay for at least the minimum, then pay the rest yourself.
- Use only a little of your limit. The CFPB says experts advise keeping it at no more than 30% of your limit. On a $300 limit, that’s under $90.
- Don’t open lots of cards at once. Applying for many in a short time can lower your score.
- Keep your first card open. Its age helps your length of history.
Check your credit report for free
Your credit report is the record your score is built from. You can get yours from all three bureaus, Equifax, Experian and TransUnion, at AnnualCreditReport.com. The FTC says free weekly reports there are now permanent. It’s the only official site for this, so be careful of lookalikes that charge you.
If you find an account you didn’t open, tell a parent right away. It could be identity theft.
Mistakes to avoid
- Paying the full balance
- Autopay turned on
- Using under 30% of your limit
- Checking your report once in a while
- Paying only the minimum (interest piles up)
- Cosigning for a friend
- Maxing out your card
- Giving your card to someone else to use
- Opening a card just for a sign-up gift
Still under 18? Start with a debit card. It won’t build credit, but it builds the habits that matter: tracking what you spend and not spending money you don’t have.
