When would a custodial account make more sense than a 529 for a child's future?

A UTMA or UGMA custodial account can be the better tool when the goal isn't specifically college. Because the money can fund anything that benefits the child, a car, a first apartment, a business, or a wedding, it offers flexibility a 529 doesn't, since non-qualified 529 withdrawals owe income tax plus a 10% penalty on earnings. Custodial accounts also let you gift appreciated assets to a child in a lower tax bracket, and there's no penalty if the child skips college. The downsides are real: no tax-free growth, heavier financial-aid impact as a student asset, and the child gains full control at the age of majority. If you're confident the money is for education, a 529 is usually superior; if you want an all-purpose head-start fund, a custodial account fits.