How to Build Credit for Your Child Before They Turn 18

Most parents assume credit building starts at 18 — when a young adult can finally open an account in their own name. But by the time your child turns 18, their peers who started early could already have two or three years of positive credit history on file.

That head start matters. A college sophomore with a 680 credit score gets approved for their first apartment. One with no credit history gets turned down, or pays a larger deposit, or has to ask a parent to co-sign. The difference between those two outcomes often starts years earlier — with a decision a parent made when the child was 15 or 16.

The good news: you don't need to wait until they're 18. You can start building their credit history today, using your own accounts.

The most effective way to build credit for a child before they turn 18 is to add them as an authorized user on one of your existing credit card accounts. For the step-by-step process, see our walkthrough.

Here's what happens when you do this: the credit card issuer begins reporting the account's history to the credit bureaus in your child's name. If your card has a clean payment record, low utilization, and has been open for several years, all of that history transfers to your child's credit file — immediately.

A child added as an authorized user at 16 on a card that was opened in 2018 doesn't just start building credit at 16. They inherit the account history going back to 2018. By the time they turn 18, they could have a credit file that looks like it's been active for years.

What you need for this to work: Your card must report authorized users to the credit bureaus — most major issuers do, but it's worth confirming. Your own payment history on the card should be clean — no late payments, low balance relative to the limit. The older the account, the better. A card you've had for five years is more valuable than one you opened last year.

What you don't have to do: give your child the physical card or let them make purchases. You can add them as an authorized user purely for credit-building purposes, keep the card yourself, and they still get the benefit.

Most major card issuers allow authorized users under 18, though minimum age requirements vary:

No minimum age: Chase, Bank of America, Citi, Discover Minimum age 13: American Express, Capital One Minimum age 15: Some smaller issuers — check your card's policy directly

Call the number on the back of your card and ask specifically about adding a minor as an authorized user. Most can be added online in your account settings in under five minutes.

The authorized user strategy works both ways. Your good credit behavior builds your child's credit. But missed payments, high balances, or account problems will appear on their credit file too.

Only use a card where you are confident the payment history will stay clean. If you're carrying a balance close to the limit, the high utilization will actually hurt your child's score rather than help it. The ideal card for this strategy has a low balance, a high limit, and has never had a late payment.

Also be aware: not every card issuer reports authorized user activity to all three bureaus. And monitor your child's credit file — child identity theft is a real and growing problem, and you should check for unfamiliar accounts at least annually. Ask your issuer whether they report to Experian, Equifax, and TransUnion. Ideally you want all three.

When your child turns 18, they become eligible to open credit accounts in their own name. This is when the full roadmap kicks in — their own secured card, potentially a credit builder loan, and eventually unsecured cards as their score grows.

Because they've been an authorized user on your account, they're not starting from zero. They may already have a credit score. When they apply for their first card or their first apartment, lenders can see a real credit history — not a blank file.

At this point you can choose to keep them as an authorized user on your card or remove them. Many parents keep the authorized user relationship active for a few more years, particularly if the child doesn't yet have enough accounts of their own to maintain a strong score. Once they have two or three accounts in their own name with at least 12 months of history, the authorized user account matters less.

A credit history without financial habits is only half the equation. As you're building your child's credit file, it's worth having the conversations about how credit works — what utilization means, why payment history matters most, how applying for new accounts affects a score.

Kids who understand the mechanics of credit are far less likely to make the mistakes that are hardest to recover from: maxing out a first card, missing a payment, or applying for five cards in a single month because they got pre-approved offers in the mail.

The goal isn't just a good credit score at 18. It's a young adult who knows how to maintain and grow it.

Think of building credit for your child in two phases:

Before 18: Authorized user strategy. Add them to your best card. Keep the account clean. Let the history accumulate. This phase requires almost no effort from your child — it runs in the background.

At 18: Hand them a personalized roadmap. Based on where their credit file stands on their 18th birthday — what accounts exist, what the score looks like, what gaps are there — they get a specific plan: which account to open first, what utilization to target, which actions will move the score fastest in the first six months.

The combination of a running head start and a clear plan at 18 is what produces a 700+ score by 20 or 21 — the score that makes early adulthood significantly easier.