What Happens to a Custodial Roth IRA When Your Child Turns 18?

You opened a custodial Roth IRA when your child was young, contributed faithfully for years, and now there’s a milestone approaching: their 18th birthday. Parents ask me some version of this question constantly — “what actually happens to the account when my kid turns 18? Does the money just… become theirs?”

The short answer: the money was always theirs. What changes at the age of majority is who controls the account. Here’s exactly how the transition works, what each major brokerage requires, and what to do (and avoid) as the date approaches.

First, a Key Point: It Was Never Your Money

A custodial Roth IRA is opened for the benefit of the minor. The child is the legal owner of every dollar from day one; the custodian (usually a parent) simply has the authority — and the obligation — to manage it in the child’s interest until they legally become an adult. Turning 18 doesn’t “give” your child the account. It removes the training wheels.

This matters because some parents hope to quietly keep control past 18, or to claw the money back for other purposes. Neither is legally an option. Once the child reaches the age of majority, they are entitled to full control of the account.

What Age Does the Transfer Actually Happen?

“Age of majority” is set by state law, not by the IRS or the brokerage:

• 18 — the age of majority in the large majority of U.S. states
• 19 — Alabama and Nebraska
• 21 — Mississippi

One common point of confusion: UTMA/UGMA custodial brokerage accounts often terminate at a different (later) age than custodial IRAs. Many states let UTMA custodianships run to 21 — or even 25 by election in some states. A custodial Roth IRA, by contrast, generally transfers at your state’s age of majority. If your child has both account types (say, a Vanguard UTMA account and a custodial Roth IRA), don’t be surprised if they hand over control in different years.

What Actually Happens Mechanically

The transition is administrative, not financial:

1. The account is re-registered — from “Parent as custodian for Child” to simply “Child.” Depending on the brokerage this happens through an online workflow or a change-of-ownership form.
2. Investments transfer in-kind — the index funds, ETFs, or stocks move as-is. Nothing is liquidated.
3. No tax event occurs — this is not a distribution, a conversion, or a sale. The IRS doesn’t even hear about it.
4. The Roth five-year clock keeps running — the account’s original start date carries over, which is one of the quiet superpowers of opening a Roth for a child early. An 18-year-old whose account was opened at 13 has already satisfied the five-year rule.
5. Contribution history is preserved — contributions remain withdrawable tax- and penalty-free at any time, just as before.

What Happens to a Vanguard Custodial Account When Your Child Turns 18?

Since this is the version of the question I hear most often, here’s the Vanguard process specifically:

• Vanguard tracks the minor’s date of birth and will send a notification as the child approaches the age of majority in your state.
• The now-adult child sets up their own Vanguard login (if they don’t already have one) and completes an ownership transfer, which re-registers the custodial Roth IRA into a Roth IRA in their sole name. In some cases Vanguard asks for a short form instead.
• The holdings — VTI, VTSAX, or whatever you invested in — move over untouched.
• If the child also has a Vanguard UTMA/UGMA brokerage account, that account follows your state’s UTMA termination age, which may be later than 18.

If you’re still deciding where to open an account, our complete guide to the Vanguard custodial Roth IRA covers the setup process from the beginning.

Fidelity and Schwab: The Same Idea, Slightly Different Paperwork

Fidelity

Fidelity’s custodial Roth IRA (marketed as the “Roth IRA for Kids”) is designed to convert to a standard Roth IRA once the child reaches the age required by their state. Fidelity contacts the account holders as the date approaches; the child opens or confirms their own Roth IRA and the assets are moved across. If the transition paperwork is ignored for long enough, Fidelity can restrict activity in the custodial account until it’s completed.

Schwab

At Schwab, the custodian initiates a change-of-ownership request once the child reaches majority — typically a short form plus the new adult’s own account application. As with the others, holdings transfer in-kind and no tax consequences result.

What If You Do Nothing?

The account doesn’t vanish, and the money doesn’t go anywhere. But three things happen over time:

• Your legal authority as custodian lapses. After the age of majority you’re no longer entitled to direct the account, even if the brokerage’s systems still let you log in.
• The brokerage may restrict the account. Once a brokerage’s records show the minor has reached majority, it can freeze trading or new contributions until the re-registration is completed.
• Contributions get awkward. New contributions for a working 18-year-old belong in their own Roth IRA, under their own login, tied to their own income documentation.

None of this is catastrophic — but it’s an easy piece of administration to knock out within a few weeks of the birthday.

A Transition Checklist for Parents

1. Before the birthday: tell your child the account exists (surprisingly often they don’t know), what’s in it, and what it’s for. Walk them through the statements.
2. At the birthday: complete the brokerage’s re-registration process promptly. Have your child set up their own login and two-factor authentication.
3. Right after: have them name a beneficiary — custodial accounts often don’t carry one over, and an 18-year-old’s estate shouldn’t depend on state intestacy rules.
4. Ongoing: if they have earned income, encourage them to keep contributing — up to the lesser of their earned income or the annual limit ($7,500 for 2026). Some parents offer a match (“I’ll add a dollar for every dollar you contribute”) to keep the habit alive through college.

Frequently Asked Questions

Does my child pay taxes when the custodial Roth IRA transfers to them?

No. Re-registration at the age of majority is not a taxable event. The account simply changes registration; the Roth tax treatment is unaffected.

Can I stay on the account after my child turns 18?

Not as custodian. If your child wants your continued help, they can grant you authorized-agent or view-only access on the new account — that’s their choice to make, which is rather the point.

Can my child cash the whole thing out at 18?

Yes — and this is the honest risk of the custodial structure. At majority it’s fully their money. They can withdraw contributions tax- and penalty-free at any time (earnings withdrawals may owe tax and a 10% penalty). The best protection isn’t legal, it’s educational: children who understand what compounding is doing for them rarely raid the account. This is a good moment for The Little Book of Common Sense Investing by John Bogle as a graduation gift.

My child is over 18 and I never opened anything — is it too late?

Not at all, but a custodial account is no longer the right tool. An adult child opens their own Roth IRA; you can still gift money to fund it as long as they have earned income to match. See our guide to choosing a Roth IRA for your adult child.