You want to save for a child. Two common vehicles exist, they look similar from the outside, and they differ in one respect that matters more than everything else combined: at the age of majority, one of them stops being yours to direct.
A custodial account becomes the child's property outright. Not a suggestion, not conditional on going to university — legally theirs, to spend on whatever they want. A 529 stays under the account owner's control indefinitely.
What changed in 2026
- 529 flexibility improved substantially. The Roth IRA rollover route for unused funds, subject to conditions, removed much of the over-funding objection that historically favoured custodial accounts.
- Qualified expenses stayed broad. Apprenticeships, student loan repayment, and certain K-12 costs widened what a 529 covers.
- Kiddie tax thresholds adjusted with inflation, moving the point at which custodial income hits parents' rates.
- Consumer apps made custodial accounts easy to open. More families opened them without encountering the control and tax implications first.
The comparison
|
UTMA / UGMA |
529 plan |
| Tax on growth |
Taxable annually |
Tax-deferred |
| Tax on withdrawal |
Capital gains as normal |
Tax-free if qualified |
| Kiddie tax applies |
Yes |
No |
| Use restrictions |
None |
Qualified education expenses |
| Who controls it |
Custodian until majority, then the child |
Account owner, indefinitely |
| Can change beneficiary |
No |
Yes |
| Financial aid treatment |
Student asset — assessed heavily |
Parent asset if parent-owned |
| State tax deduction |
No |
Often |
| Contribution limits |
Gift tax rules |
Gift tax rules, plus plan maximums |
Read the control row twice. At the age of majority — 18 or 21 depending on the state — a custodial account transfers to the child. They can withdraw all of it. There is no mechanism for the custodian to prevent it, no condition you can attach, and no way to claw it back if they decide to spend it on something other than what you intended.
That is not a criticism of custodial accounts; it is the legal nature of a gift to a minor. It is simply the thing to be certain about before choosing one.
Tax treatment in practice
529. Contributions are after-tax at the federal level, growth is untaxed, and withdrawals for qualified education expenses are untaxed. Many states offer a deduction or credit for contributions to their own plan. There is no annual tax reporting because there is no annual income to report.
UTMA. The account is the child's, so its income is the child's income, reportable annually. Dividends, interest, and realised gains are taxed each year — and above a threshold at the parents' marginal rate under the kiddie tax, which persists for full-time students into their early twenties. See the kiddie tax.
For education saving specifically, the 529 wins clearly on tax. The comparison only becomes interesting when the money is not for education.
Financial aid
Frequently overlooked and materially significant.
Aid formulas assess student-owned assets far more heavily than parent-owned ones. A custodial account is the student's asset by definition, so a large balance can reduce aid eligibility considerably. A parent-owned 529 is assessed as a parental asset at a much lower rate.
Grandparent-owned 529s have their own treatment, which has shifted in recent years in a favourable direction. If aid is likely to matter, confirm current rules rather than relying on older guidance, since this specific area has changed.
When a UTMA still makes sense
It is the right tool when the money is genuinely not earmarked for education and you are comfortable with the transfer at majority.
A general "start in life" fund — a car, a house deposit, starting a business, or simply capital — fits a custodial account and does not fit a 529, whose non-qualified withdrawals carry tax and a penalty on the earnings.
It is also simpler to understand and has no restrictions, which some families value.
The honest framing: choose a UTMA when unrestricted use matters more than tax efficiency and you accept giving up control. Choose a 529 when the money is for education. The old argument for custodial accounts — flexibility if the child does not attend university — has weakened considerably now that a 529 beneficiary can be changed and unused funds have a Roth rollover route.
Common mistakes
- Not understanding the transfer at majority. The most consequential misunderstanding in this comparison.
- Using a UTMA for education savings. Worse on tax, control, and aid.
- Assuming a 529 is only for university. Qualified uses are broader than they were.
- Realising large gains in a UTMA at once. Triggers kiddie tax at your rate.
- Ignoring state 529 benefits. Many states offer a deduction, usually only for their own plan.
- Over-funding without knowing the exits. Beneficiary changes and Roth rollovers exist and have conditions worth understanding.
FAQ
Can I move a UTMA into a 529?
You can liquidate and contribute to a custodial 529, and it remains the child's property with the same transfer-at-majority rule — you do not regain control. Liquidating also realises gains, which may trigger kiddie tax.
What if the child does not go to university?
Change the beneficiary to another qualifying family member, use it for an apprenticeship or student loan repayment, roll a limited amount to their Roth IRA subject to conditions, or withdraw and pay tax and a penalty on earnings only.
Can I have both?
Yes, and it is a reasonable combination — a 529 for education and a modest custodial account for general purposes, sized so the aid impact is limited.
Who pays the tax on a UTMA?
The child, on their return, with kiddie tax applying their parents' rate above the threshold. Some families can report it on the parents' return where eligibility rules permit.
Where to go next
For the tax rule that drives most of this comparison, read the kiddie tax. For accelerating 529 contributions, 529 superfunding, and for what counts as qualified, 529 plan withdrawal rules.
This is general information, not financial advice. Age of majority, state tax treatment, and aid formulas vary; confirm current rules for your state and situation.