What Happens When Your Child Turns 18: The Custodial Account Handoff

For years you've been the one logging in, contributing, and keeping an eye on your kid's accounts. Around their 18th birthday, several of those accounts change hands or change form — some all at once. Knowing what shifts, and when, turns a potentially jarring moment into a milestone you can actually plan for.

Account by account: what changes at 18

UTMA — it becomes their money

A custodial UTMA transfers to your child at the age of majority — 21 in most states, 18 in some, and a few let you specify up to 25. On that birthday, the account is legally theirs. They can log in, withdraw the balance, and do whatever they want with it. There's no approval step and no clawback. If the balance is large, this is the moment parents most wish they'd prepared for sooner.

Trump Account — it shifts into retirement-style treatment

The new federal Trump Account is designed to convert at 18 into a traditional-IRA-style account. The growth that built up tax-deferred keeps compounding, but the rules that govern it (and the tax on eventual withdrawals) start to look like a retirement account. The specifics live in our Trump Accounts guide — the headline for this milestone is simply that the account doesn't disappear — it graduates.

Custodial Roth IRA — it was always theirs

A custodial Roth IRA simply converts to a regular Roth IRA in your child's name. The money was always earmarked for them; now they're the account holder. Decades of tax-free compounding continue, and they take over the login. This is usually the smoothest handoff of the bunch.

529 — nothing forced changes

Unlike the others, a parent-owned 529 stays with you. Turning 18 doesn't transfer control. You decide when and how to use it for qualified education expenses, and you can still change the beneficiary. It's the one account on this list that doesn't flip.

The quick reference

What to prepare before the birthday

1. Know your state's majority age. 18 or 21 changes the timeline for the UTMA handoff entirely — confirm it so you're not caught off guard.
2. Get the logins and paperwork in order. Your child will need access to the accounts that become theirs. Sort out usernames, two-factor, and any custodian forms ahead of time, not in a scramble.
3. Have the conversation early — ideally years early. A teen who's watched the account grow and understands what's in it inherits context, not a surprise windfall. That difference is everything.
4. Right-size expectations on the UTMA. If a large balance transferring at 18 worries you, that's a planning conversation to have with a tax or financial professional before the date, not after.

Make it a milestone, not a surprise

The families who navigate this well all do the same thing: they make the money visible for years beforehand. When an 18-year-old has spent a decade glancing at their own account — seeing it grow, asking questions, connecting the balance to real decisions — the handoff is a graduation, not a shock. That long runway is exactly what MemoryBank is built to give them — starting with seeing all your kid’s investment accounts in one place.

What to do this week

1. Look up the age of majority in your state and mark the real handoff date — the kids’ accounts by state explorer shows it (plus your state’s 529 tax treatment) in one place.
2. Make a short list of which accounts transfer and what each one needs.
3. If your kid is a teen, start showing them the accounts now — give them runway.
4. Keep everything in one view in MemoryBank so the handoff is a continuation, not a cold start.

Frequently asked questions

What happens to a UTMA when my child turns 18?

It transfers to the child at the age of majority — 21 in most states, 18 in some, and a few states let you specify up to 25. They can log in, withdraw the balance, and use it for anything, with no approval step and no clawback.

What happens to a Trump Account at 18?

It converts into a traditional-IRA-style account. The tax-deferred growth keeps compounding under retirement-account rules — the account graduates, it doesn't disappear.

Does a custodial Roth IRA change at 18?

It simply becomes a regular Roth in the child's name — the smoothest handoff of the bunch, since the money was always theirs.

Does a 529 transfer to the child at 18?

No. A parent-owned 529 doesn't change at 18 — you keep control and can still change the beneficiary. It's the one account that doesn't flip.

How do I prepare for the custodial account handoff?

Confirm your state's age of majority, get logins and any custodian paperwork in order ahead of time, and have the conversation early so a teen inherits context, not a shock.