Investing for Kids: Custodial Accounts vs. 529s vs. Roth IRAs

7 min read

Investing Fundamentals

Want to give a child a head start? The best gift isn't a savings account paying 0.01% — it's time in the market. But the account you choose determines how the money is taxed, who controls it, and whether it helps or hurts financial aid.

The Three Main Vehicles

	UTMA/UGMA	529 Plan	Roth IRA (for minors)
Purpose	Anything for the child	Education	Retirement (or later, education)
Who controls	Custodian until age 18–25	Account owner (usually parent)	Custodian until age of majority
Taxes	Child's rate (with limits)	Tax-free for education	Tax-free growth
Financial aid impact	High (child's asset)	Moderate	Low (retirement assets)

UTMA/UGMA: The Flexible Custodial Account

A custodial account (UTMA/UGMA, named after the laws that created them) lets you save and invest in a child's name. There are no contribution limits and no restriction on what the money is used for — it's the child's money, for their benefit, period.

The two big catches:

Control transfers automatically when the child reaches the age of majority (18 in most states, up to 21 or 25 depending on the state and account type). At that point, the money is theirs to do with as they please — tuition, a car, or a bad decision.
Financial aid impact. Custodial accounts are counted as the student's asset, which the FAFSA weighs much more heavily than parental assets. A large custodial account can meaningfully reduce need-based aid.

The tax treatment: the first portion of a child's investment income is tax-free, the next is taxed at the child's rate, and beyond that, the "kiddie tax" applies the parent's rate. For most families, this is a modestly tax-efficient way to invest a child's birthday and holiday money.

529 Plan: The Education-Specific Choice

A 529 grows tax-free and withdrawals are tax-free when used for qualified education expenses (college, trade school, some K-12). The parent (account owner) stays in control, can change beneficiaries, and many states offer a tax deduction for contributions.

The new flexibility: starting in 2024, up to $35,000 of unused 529 funds can be rolled over to a Roth IRA for the beneficiary — subject to annual contribution limits, a 15-year account holding period, and earned-income requirements. That removed the biggest historical objection to overfunding a 529: being "stuck" with the money if the child doesn't go to college.

Financial aid impact: a parent-owned 529 is treated as a parental asset, which is more favorable than a custodial account.

Roth IRA: The Retirement Head Start (If They Earn Income)

If a child has earned income (babysitting, a summer job, a family business), they can contribute to a Roth IRA up to the amount they earned, capped at $7,000 (2026). Because contributions are after-tax and growth is tax-free, a Roth opened at 15 can compound for 50 years — a nearly unbeatable head start. Contributions (not earnings) can also be withdrawn penalty-free for education.

The catch is the earned-income requirement: no income, no contribution.

How to Choose

Definitely want it for education? A 529 is the default — tax-free growth, parental control, and state deductions.
Want flexibility, and the child is young? A custodial account works, but plan for the control transfer at age 18.
Child has earned income? Fund a Roth IRA first. The long time horizon is priceless.
Doing a bit of everything? Many families use a 529 for the bulk, plus a small custodial account for gifts, plus a Roth if the child works.