A 529 plan is a tax advantaged account for saving toward education. You put in money that has already been taxed, it grows without being taxed year to year, and withdrawals come out free of federal tax as long as you spend them on qualified education costs. Its legal name is a qualified tuition program, after the section of the tax code that created it in 1996.

That core deal, tax free growth for education, has not changed. What has changed for 2026 is the flexibility around the edges: a higher limit on K-12 spending, a route to roll leftover money into a Roth IRA, and the usual annual gift tax figures. Here is how it works now.

The two types, and the tax deal

There are two kinds of 529. A prepaid tuition plan lets you lock in future tuition at today's prices, usually at in state public colleges. An education savings plan, the far more common type, works more like a retirement account: you choose from a menu of investment options, and the balance rises or falls with the markets. Each state runs its own plan, and you are not limited to your home state's.

The tax treatment is the point. The IRS says earnings in a 529 "are not subject to federal tax and generally not subject to state tax" when used for qualified education expenses. Contributions are not deductible on your federal return, though many states offer a state income tax deduction or credit for using their plan, which is the main reason it often pays to look at your home state's plan first. If you take money out for something that does not qualify, the earnings portion is taxed as income and generally hit with a 10% penalty, though the penalty is waived in specific cases such as a scholarship or the beneficiary's death or disability.

What counts as a qualified expense

Qualified expenses are broader than tuition. They include fees, books, supplies and equipment, and room and board for students enrolled at least half time. They also cover computers, software and internet access used by the student. Beyond college, a 529 can pay for registered apprenticeship program costs and up to $10,000 over a lifetime toward student loan repayment for the beneficiary.

K-12 is where 2026 brings a change. The IRS has long allowed up to $10,000 a year from a 529 for tuition at elementary and secondary schools. Tax advisers report that under the One Big Beautiful Bill Act, the federal limit for K-12 expenses rises to $20,000 per beneficiary beginning in 2026, with a wider set of eligible costs such as tutoring and testing. State tax treatment does not always follow the federal rules, so a withdrawal that is qualified federally can still be treated differently by your state.

Contribution limits and the gift tax angle

There is no federal annual contribution cap on a 529. Instead, each state sets a high aggregate limit per beneficiary, often several hundred thousand dollars, after which no more contributions are allowed.

The practical limit most families run into is the gift tax. Contributions count as gifts to the beneficiary. The IRS set the 2026 annual gift tax exclusion at $19,000 per recipient, or $38,000 for a married couple splitting the gift, and contributions up to that amount raise no gift tax issue. A special 529 rule lets you front load five years of gifts at once, up to $95,000 from one person or $190,000 from a couple, without triggering gift tax, as long as you file the right form and make no other gifts to that person for five years.

The Roth rollover for leftover money

One worry that keeps families from funding a 529 is what happens to money left over if the child does not need it all. A rule from the SECURE 2.0 law addresses that. Starting in 2024, you can roll unused 529 money into a Roth IRA for the same beneficiary, up to a $35,000 lifetime cap. The 529 account must have been open at least 15 years, the rollovers count against the beneficiary's normal annual Roth contribution limit, and other conditions apply. It is not a loophole for unlimited transfers, but it does soften the risk of overfunding.

How it fits your wider plan

A 529 is one tax advantaged account among several, and it is worth seeing where it sits. The tax free compounding is the heart of the case, and the longer the money has to grow, the more it matters, a point our explainer on compound interest lays out. For families weighing education saving against retirement, our comparison of a Roth IRA versus a 401(k) is a useful companion, because advisers generally caution against shortchanging retirement to overfund a 529.

The bottom line

For money you are confident will go toward education, a 529 plan offers a genuinely strong tax benefit, and the 2026 changes make leftover funds easier to repurpose. The caveats are the ones that always apply to tax advantaged accounts: the break only works for qualified spending, non-qualified withdrawals face tax plus a penalty on earnings, and your own state's rules may differ from the federal ones. Check your state's deduction and the current limits before you commit, and weigh a 529 against your other goals rather than in isolation. This is general information, not personal financial advice.