If your child doesn't go to college or doesn't need all the 529 funds, perhaps due to scholarships, you have a few options for using what's left. One is to transfer or roll over the 529 account to a new beneficiary. To be an income tax-free rollover, that person must be a member of the original beneficiary's family, such as siblings (including stepsiblings), parents, spouse, children, first cousins, nieces and nephews. You can also name yourself as a beneficiary (assuming you are a family member of the beneficiary) and use the funds for your own education or training, either in your current career or as a way to begin a new one. This strategy isn't possible, however, for custodial 529 plans — as that beneficiary designation is irrevocable.
If your child receives a scholarship, grant or attends a U.S. military academy, you may withdraw an amount equal to the scholarship/grant (or the costs of advanced education attributable to attendance at the military academy) from the 529 account without having to pay the 10% additional federal tax; you will owe only the federal ordinary income taxes on the earnings portion of the withdrawal. State and local income taxes may also apply. The 10% additional tax is also waived if the beneficiary dies or becomes disabled. You can also roll over a 529 into an ABLE account (a tax-advantaged savings account that benefits those who are disabled), subject to ABLE contribution limits. Beginning in 2024, you can also roll over 529 assets to a Roth IRA for the beneficiary if the 529 account has been open for at least 15 years and meets certain other conditions.
Also keep in mind that there aren't any distribution deadlines on 529 account assets, so assets can remain in an account and be used to fund the beneficiary's graduate or other schooling at a later date. Finally, you can close the account and take a non-qualified withdrawal. In that case, federal income taxes, state and local income taxes, and the potential additional 10% federal tax on earnings will apply.