How to Build Credit at 18

At 18 you can legally hold a credit card in your own name, and the CARD Act requires anyone under 21 to show independent income or a co-signer. That is the only real obstacle. Everything else is a matter of picking a route and then doing something extremely boring for two years.

The boring part is the part that works: one small account, paid on time, every month.

Four routes, in order

Authorised user, with one warning

Being added to a parent's or guardian's existing card is the fastest start, because the account's history — which may be a decade old — can appear on your report. You do not need to use the card, or even hold it.

The warning is that it works in both directions. If they miss payments or run the balance to the limit, that lands on your file too. Only do this with someone who pays in full every month, and confirm the issuer actually reports authorised users, because not all of them do.

Your own card

An account in your own name is what you ultimately need, and at 18 that means a student card or a secured card. Enrolled students should try a student card first: no deposit, and often modest rewards. Everyone else should start with a secured card, which approves on the deposit rather than on a file you do not have. See how much deposit is required.

The income question catches people out. Under 21 you must show your own ability to pay — a part-time job, regular freelance work, a stipend. Report it honestly; issuers can ask for verification.

The four rules that do the work

1. Pay the statement in full, every month, on time. Payment history is the largest factor in the score, and a single 30-day late payment can stay on your report for seven years.
2. Use a small fraction of the limit. Under 30%, ideally under 10%. On a $300 limit, that is $30 to $90. Utilisation is the second largest factor.
3. Autopay the minimum, then pay in full manually. Autopay protects you from forgetting; paying in full protects you from interest.
4. Do not close the first card. Its age keeps counting, and closing it drops your total available credit.

A card used for one $25 subscription and cleared monthly builds credit exactly as well as one running through $2,000. There is no bonus for volume.

What goes wrong

• Applying to several cards at once. Each application is a hard inquiry, and with a thin file they weigh more heavily.
• Treating the limit as money. A $500 limit is not $500 of income; it is a $500 loan at an unpleasant rate.
• Paying only the minimum. It keeps the account current and starts the interest. See the minimum payment trap.
• Chasing rewards first. Cashback on a card you cannot get approved for is worth nothing. Approval, then habits, then rewards.

What to expect

A score roughly six months after the first account reports. Fair to good territory after a year or two of clean history. Around the two-year mark, a secured card can often be upgraded and the deposit returned — and by then the account's age is doing useful work on the score.

Related

The cards: best for no credit, best student cards. The mechanics: what score you need, Credit Score 101, your free report.

Investing before 21: best stock apps for teens.

Common questions

Can I get a credit card at 18?

Yes. Under 21 you must show independent income or have a co-signer under the CARD Act, which is why student and secured cards are the usual starting points.

Does being an authorised user build my credit?

It can, if the issuer reports authorised users to the bureaus. The account’s payment history — good or bad — then appears on your report.

How long does it take to build credit from nothing?

About six months to generate a score, and one to two years of on-time payments to reach good territory.

Do I need to carry a balance to build credit?

No. Carrying a balance only costs interest. Paying the statement in full each month builds credit just as effectively.