How a 529 Plan Works: Tax-Free Savings for Education, and the Roth Rollover

A 529 plan is the main US account for education savings. You pay in money that was already taxed, it grows with no tax, and it comes out with no federal tax when you spend it on school: college, university, trade school and, within limits, private school before college. Many states also give you a deduction on your state return. This guide explains how the account works, what counts as an education cost, and what happens if the child does not need the money. All figures are for 2026.

How a 529 plan works

Each state runs its own 529 plan, and most accept savers from any state. You open the account as the owner, and you name a beneficiary: your child, a grandchild, a niece, a friend, or yourself. Anyone can then pay in, such as parents, grandparents or family friends.

• On the way in. No federal deduction. But more than 30 states give a deduction or a credit on the state return, often only for their own state's plan. This is the main reason to look at your home state's plan first.
• While it grows. No tax on dividends or gains.
• On the way out. No federal tax (and usually no state tax) on a withdrawal spent on qualified education costs.

You, the owner, keep control of the money, not the child. You decide when to pay out, and you can change the beneficiary to another family member at any time with no tax. The rules are in the IRS questions and answers on 529 plans and IRS Topic 313.

How you invest it

You choose from the plan menu. Most plans offer age-based portfolios, which move from stocks to bonds and cash as the child gets closer to college, and a set of index funds. You can change the investments in your account twice a year.

What counts as a qualified education cost

Keep the receipts, and make the withdrawal in the same year as the cost. Your plan sends you a Form 1099-Q for each year with a withdrawal.

How much you can put in

There is no federal yearly limit. Each state sets a total limit per beneficiary, usually between about $235,000 and more than $600,000. Once the account reaches it, you cannot pay in more.

The real limit for most families is the gift tax. A payment into a 529 is a gift to the beneficiary. In 2026, you can give up to $19,000 per person per year with no gift-tax return (a couple can give $38,000). Above that, you file a return, but you pay no gift tax unless your lifetime gifts are above the estate-tax exclusion of $15,000,000.

Front-loading five years at once

A special rule lets you put five years of gifts into a 529 at once: up to $95,000 per person ($190,000 for a couple) for one beneficiary, treated as if you spread it over five years. You file a gift-tax return to make the choice, and you cannot give that beneficiary more in the next four years without using part of your lifetime exclusion. Grandparents often use this rule to give a large sum early, so it has more years to grow.

If the child does not use the money

This is the question most parents ask, and the answer is better than many expect.

1. Change the beneficiary. Move the account to a brother or sister, a cousin, a future grandchild, or yourself. No tax.
2. Keep it. The account has no time limit. It can wait for graduate school, or for the next generation.
3. Roll it over to a Roth IRA. See the next section.
4. Take it out. Only the earnings are taxed, as ordinary income of the person who receives the money, plus a 10% additional tax. Your contributions come back free. The 10% does not apply if the child gets a scholarship (up to its amount), goes to a US military academy, becomes disabled or dies.

The rollover to a Roth IRA

Since 2024, unused 529 money can move to a Roth IRA for the beneficiary, with no tax and no penalty. The conditions:

• the 529 account has been open for at least 15 years;
• money paid in during the last five years (and its earnings) cannot be rolled over;
• the yearly Roth IRA limit applies ($7,500 in 2026), and the beneficiary must have earned income at least equal to the amount;
• a lifetime maximum of $35,000 per beneficiary.

At $7,500 a year, it takes about five years to move the full $35,000. That gives a child a large start on retirement savings. Read how a Roth IRA works. Because of the 15-year rule, it helps to open a 529 early, even with a small amount.

529 plans and financial aid

On the FAFSA, a 529 owned by a parent counts as a parent asset, which reduces aid by at most about 5.6% of its value. A 529 owned by a grandparent is not reported at all under the current FAFSA. This is better than a custodial account in the child's name, which counts as a student asset at a much higher rate. Read how a UTMA account works.

Foreign withholding inside a 529

One cost the account cannot remove: tax that a foreign country withholds on its dividends. A 529 cannot claim the foreign tax credit, and it does not get the treaty exemption that some retirement accounts have, because it is not a retirement account. So that withholding is lost for good. Read more in what is dividend withholding tax.

Track your 529 plan with the rest of your portfolio in Cadances

A 529 plan is a family account: you may have one per child, at different state plans, next to your own 401(k), IRAs and taxable account. Cadances is a portfolio tracker: it puts all of them in one place and gives you one total, one allocation and one performance figure.

• An account type priced the way the law prices it. On the Portfolios screen, the 529 plan is its own account type, next to the IRAs, the 401(k), the HSA and your taxable accounts. Dividends and gains inside it show as untaxed, so your income forecast is not cut by a tax you do not pay.
• The rules, made visible. For US residents, the Tax screen tells you there is no federal yearly limit, and prices what a non-qualified withdrawal would cost today: tax on the earnings only, because your contributions come back free.
• One portfolio per child. Keep each 529 in its own portfolio, so you can follow each child's savings separately, and see your family's total in one view. Import the export file from your plan, or add the funds by hand.
• Performance and allocation. On Performance, compare each 529 with the S&P 500 over the window you pick. Set allocation rules on each portfolio (for example, bonds at least 50% when college is five years away) and see when the mix drifts away from your target.

Two limits to keep in mind: Cadances does not know your state, so it does not show your state's total limit or your state deduction. And it does not keep the full history of your contributions, so it cannot check the 15-year and five-year tests of the Roth rollover for you.

Start free. Create your Cadances account: no card, no time limit. The Free plan holds one portfolio of up to 15 holdings, which is enough for one 529 plan. To track a 529 for each child next to your own accounts, compare the paid plans.

The bottom line

• A 529 grows with no tax and pays out with no federal tax for qualified education costs.
• Look at your home state's plan first for a state deduction.
• There is no federal yearly limit; the gift-tax exclusion is $19,000 per person in 2026, and you can front-load five years.
• K-12 private school tuition counts up to $20,000 a year from 2026.
• Unused money can change beneficiary, wait, or roll over to a Roth IRA (up to $35,000 after 15 years).
• A non-qualified withdrawal taxes only the earnings, plus 10%.

Each monthly payment is dollar-cost averaging by design, and a diversified mix inside the account matters as much as the amount you put in.

This article is general information, not tax or legal advice. Your plan documents and your state's rules decide what applies to you.