What Happens to a 529 Plan When Your Child Turns 18?

When your child turns 18, nothing automatic happens to a 529 plan you opened for them. You still own the account, you still decide when money comes out and where it goes, and the beneficiary has no new rights to the funds. What changes at 18 is practical rather than legal: your child is likely heading into college, an apprenticeship, or another path that finally puts the account to work.

The one situation where 18 matters legally is a custodial 529 opened under UGMA or UTMA rules. Everything else about the account keeps running the way it did the day you opened it.

You Still Own the Account

Federal law separates the account owner from the beneficiary. The owner opens the plan, contributes to it, and directs every transaction. The beneficiary is just the person whose education the money is earmarked for. The owner’s authority isn’t tied to the beneficiary’s age at all. A parent who opened a 529 at their child’s birth has the same control at 18, 25, or 40.¹

That control is broader than many parents realize. You can change the beneficiary to another qualifying family member with no tax consequences. You can take a non-qualified withdrawal and keep the money yourself, accepting the tax cost on the earnings. A standard 529 is not a trust fund the child inherits at a set age. It stays with you unless you choose to move it.

The Custodial 529 Exception

Custodial 529 accounts work differently. When a 529 is opened under a state’s Uniform Gifts to Minors Act or Uniform Transfers to Minors Act, the contributions are irrevocable gifts to the child from the moment they’re made. An adult acts as custodian, but the assets legally belong to the child the whole time.

The age at which the beneficiary takes over depends on state law. In many states it’s 18, some set it at 21, and a few allow up to 25.² Once your child hits that age, you hand over control. They can then spend the money however they want, though the same tax rules on qualified versus non-qualified withdrawals still apply. If you’re not sure which type of account you have, check the application paperwork or ask the plan administrator; a regular 529 will not say “UGMA” or “UTMA” anywhere on it.

What the Money Can Pay For Now

With the beneficiary approaching or starting school, you can begin taking tax-free distributions for qualified higher education expenses. That covers tuition, fees, books, supplies, and equipment required for enrollment. Room and board also qualify, but only if the student is enrolled at least half-time.¹

Computers, printers and other peripherals, internet access, and educational software all qualify as long as the beneficiary uses them while enrolled at an eligible school. Equipment used mainly for entertainment doesn’t count.³

The SECURE Act of 2019 opened two additional uses that matter for an 18-year-old who isn’t headed to a four-year college:

Registered apprenticeship costs. Fees, textbooks, supplies, and required tools for programs certified by the U.S. Department of Labor qualify for tax-free distributions.
Student loan repayment. Up to $10,000 in 529 funds can go toward the beneficiary’s student loans over their lifetime, with a separate $10,000 available for each of the beneficiary’s siblings.

Eligible schools aren’t limited to U.S. institutions. Foreign universities that participate in federal student aid programs and have a Federal School Code count too. You can confirm a school’s status through the Department of Education’s school code lookup.

Getting Withdrawals Right

The most expensive mistake families make once they start pulling money is a timing mismatch. Distributions and the expenses they pay for have to fall in the same calendar year, not the same academic year. If you pay a spring tuition bill in December but request the 529 withdrawal in January, that gap can turn a tax-free distribution into a taxable one.

You have flexibility in how the money moves. Payments can go directly to the school, to you as reimbursement, or to the beneficiary’s bank account. All three work. What matters is keeping receipts and billing statements that tie each distribution to real qualified expenses in the same tax year.

Coordinating With Education Tax Credits

You can’t use 529 funds and claim an education tax credit like the American Opportunity Tax Credit for the same dollar of expense. But you can claim both benefits in the same year if you split expenses carefully.

The AOTC is worth up to $2,500 per student and only needs $4,000 in qualifying tuition and fees to max out. A common approach is to pay at least $4,000 in tuition from non-529 sources to claim the full credit, then use the 529 for everything else: remaining tuition, room and board, books, computers, and supplies. Room and board qualify for tax-free 529 distributions but don’t count toward the AOTC, so there’s no overlap risk there.

The Lifetime Learning Credit works the same way. Any expense you use for a credit has to come out of the 529 tax-free calculation. Accidental overlap makes part of your 529 distribution taxable.

If Your Child Isn’t Going to College

If the beneficiary skips college, wins a full scholarship, or finishes school with money left over, the account can stay open indefinitely. You have several options that don’t cost you anything in taxes or penalties.

Change the Beneficiary

You can move the funds to another qualifying family member with no tax hit. The IRS defines family broadly: siblings, parents, children, first cousins, nieces, nephews, aunts, uncles, and their spouses all qualify.¹ You can even name yourself as the new beneficiary if you want to go back to school. Tax-advantaged growth continues without interruption.

Roll Funds Into a Roth IRA

Starting in 2024, the SECURE 2.0 Act created a way to move unused 529 money into a Roth IRA in the beneficiary’s name. The rules are strict:

The 529 must have been open for at least 15 years.
The lifetime cap per beneficiary is $35,000.
Each year’s rollover cannot exceed that year’s Roth IRA contribution limit. In 2026, the limit is $7,500 for individuals under 50.⁴
Contributions made in the five years before the rollover, plus their earnings, are not eligible.
The beneficiary needs earned income at least equal to the rollover amount for the year.

Reaching the $35,000 lifetime cap takes at least five years of rollovers. It’s a useful exit for families who overfunded, but it needs planning years ahead.

Take a Non-Qualified Withdrawal

You can always pull the money out for anything. The earnings portion gets taxed as ordinary income plus a 10% federal penalty; your original contributions come back tax-free and penalty-free.¹

A few situations waive the 10% penalty while still taxing the earnings:

The beneficiary receives a scholarship. You can withdraw up to the scholarship amount penalty-free.
The beneficiary becomes disabled.
The beneficiary dies.
The beneficiary attends a U.S. military academy, up to the equivalent cost of attendance.

Some states also recapture state income tax deductions previously claimed on contributions if you take a non-qualified withdrawal. Check your state plan’s rules before pulling money out for something other than education.

How the 529 Affects Financial Aid Now

For a dependent student filing the FAFSA, a parent-owned 529 is reported as a parent asset. The federal aid formula assesses parent assets at a maximum of about 5.64% of value, so a $50,000 balance might reduce aid by roughly $2,800.

A custodial 529 owned by a dependent student is also treated as a parent asset on the FAFSA, not a student asset, regardless of who serves as custodian. The higher 20% student-asset rate only applies if the student files as independent, which is uncommon for traditional undergraduates.

Grandparent-owned 529 plans used to hurt aid eligibility because distributions counted as student income. That rule ended with the simplified FAFSA that took effect for the 2024-2025 academic year; distributions and cash support from a grandparent’s 529 no longer have to be reported. Some private colleges still ask about relatives’ 529 accounts on the CSS Profile used for institutional aid.

One Housekeeping Task Worth Doing

Name a successor owner if you haven’t. If you die without one, the 529 can pass through probate and end up controlled by your estate plan rather than by someone positioned to manage it for the beneficiary. Most plans let you name one or two successor owners through a short form, and it takes about five minutes.

1
Office of the Law Revision Counsel. 26 USC 529 – Qualified Tuition Programs
2
Social Security Administration. POMS SI SEA01120.205 – The Legal Age of Majority for UTMA
3
Internal Revenue Service. 529 Plans – Questions and Answers
4
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500