Complete guide

529 vs. custodial account: how to save for a child or grandchild

There's more than one way to put money aside for a child — and the right one depends on what the money is for and how much control you want to keep. This is the overview of the main vehicles, how they compare, and how family gifting fits in. For the superfunding math, the calculator is linked below.

The main ways to save for a child

When parents and grandparents set money aside for a child, it usually lands in one of two places: a 529 college-savings plan or a UTMA/UGMA custodial account. They solve different problems. A 529 is built for education and carries the best tax treatment for that purpose; a custodial account is flexible money that becomes the child's outright at adulthood.

529 plans

A 529 is a tax-advantaged account for education. Contributions grow tax-free and come out tax-free when used for qualified education costs. The account owner (often a parent or grandparent) keeps control, names the beneficiary, and can change it. Many states add a deduction or credit for residents who contribute. The trade-off: money used for non-education purposes is taxed and penalized on the earnings.

UTMA / UGMA custodial accounts

A custodial account holds money or investments for a minor under an adult custodian until the child reaches the age of majority — at which point it becomes theirs to use for anything. It's far more flexible than a 529 (no education requirement), but you give up control at adulthood, and the earnings can be subject to the "kiddie tax," which taxes a child's investment income above a threshold at the parents' rate.

529 vs. custodial — the trade-off

 529 planUTMA / UGMA
Best forEducation costsFlexible, any purpose
Tax on growthTax-free for educationTaxable; kiddie-tax rules apply
Who controls itThe account owner, indefinitelyCustodian until the child's majority
When the child gets itOnly for qualified costs you approveOutright at adulthood
State tax breakOften yes, for residentsNo

Many families use both: a 529 for the education base, and a smaller custodial account for flexibility.

Gifting into a child's accounts

Money you put into a child's 529 or custodial account is a gift, so it counts against the $19,000 annual exclusion (2026). That's rarely a problem — but a 529 has a special perk: superfunding. The 5-year election lets you front-load up to five years of exclusions at once — up to $95,000 per donor ($190,000 per couple) per child — without using any lifetime exemption.

See exactly how much you can front-load and what it could grow to with the 529 Superfunding Calculator. To make sure family contributions stay within everyone's gift limits, the Gift Tax Calculator checks the exclusion across recipients.

Free college & gifting tools

Front-load a 529 the smart way, and keep family gifts within the limits.

Common questions

Is a 529 or a custodial account better?

A 529 is better for education-specific saving and tax-free growth; a custodial account is better when you want flexibility and don't mind the child taking control at adulthood. Many families use both.

Can grandparents open a 529?

Yes. Grandparents can open their own 529 for a grandchild or contribute to a parent-owned one. Contributions are gifts under the annual exclusion, and superfunding lets them front-load up to $95,000 in one year.

What is the kiddie tax?

A rule that taxes a child's investment income above an annual threshold at the parents' tax rate, which most affects UTMA/UGMA custodial accounts rather than 529s.

This guide is general information, not tax or legal advice. 529, custodial, and gift rules change and vary by state; verify current figures with the IRS and your state plan, and consult your CPA.

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