Guide to 529 Plans

The account nobody told her about

Maya is 23, a year out of school, and there’s roughly $18,000 sitting in a 529 her grandparents opened when she was eight. Scholarships and a cheaper-than-expected in-state degree left more in the account than anyone planned for. She’s been told, or just assumes, that she has two options: spend it on grad school, or eventually pull it out and eat income tax plus a 10% penalty. So she’s been doing nothing.

She’s wrong about both options. The money isn’t stuck, and the penalty is a last resort she’ll probably never need. Since 2024 there’s a third door: roll the leftover into her own Roth IRA, tax-free and penalty-free. Because the account has been open more than 15 years, that door is already open to her.

This guide is about that door. The audience here skews young-adult, which means most readers are the beneficiary of a 529, not the owner — if a parent or grandparent opened one for you and there’s a balance, this is what to do with it now. If you’re starting one for your own kids, the playbook for that is near the end.

What a 529 actually is

A 529 plan is a state-sponsored, tax-advantaged account built for education costs. Someone puts after-tax money in, the investments grow tax-free, and withdrawals for qualified expenses come out tax-free — tuition, fees, books, room and board, and a few newer categories.

The detail that matters for Maya: she doesn’t control the account. Whoever opened it, a parent or grandparent or aunt, is the owner, and the owner makes the calls on investments, withdrawals, and who the beneficiary is. Maya is the beneficiary, not the boss. That distinction sets up the one piece of friction in her plan, so hold onto it.

(There’s also an older, rarer type — prepaid tuition plans, where you pre-pay tomorrow’s tuition at today’s rates. They’re more restrictive, and several states have wound theirs down. Everything below is about the common savings-plan version.)

The old rule, and what changed in 2024

For most of the 529’s life, the deal was exactly what Maya thinks it is: use the money for school, or pay a price to get it back. Leftover funds meant a non-qualified withdrawal: income tax plus a 10% penalty on the growth, which is why “what if my kid doesn’t use it all?” kept people from funding these accounts in the first place.

That changed with SECURE 2.0. Starting in 2024, leftover 529 money can roll into the beneficiary’s Roth IRA. Same account, same dollars, a completely different exit — the 529 quietly went from “use it or pay penalties” to “education savings with a retirement exit ramp.” It’s the single most important thing to know about a 529 today, and it’s the rule almost nobody has heard of.

The rollover, in plain language

The rollover comes with five conditions: two clocks, the question of whose Roth the money lands in, and two dollar limits. One more constraint, earned income, trips up more young readers than any other; it comes just after the five.

• The account must have been open at least 15 years. This is the clock that decides whether the door is open at all. A 529 opened in your childhood has almost certainly cleared it; one opened recently has not.
• Only contributions at least 5 years old can roll. Money added in the last five years has to wait its turn — so a recent top-up doesn’t jump the line.
• The Roth IRA has to belong to the beneficiary — the same person the 529 is for. The rollover funds your retirement, not the owner’s.
• Each year’s rollover counts against that year’s IRA contribution limit ($7,500 in 2026 for under-50s) and can’t exceed it. This is the throttle: the money moves at the speed of one year’s IRA room at a time.
• There’s a lifetime cap of $35,000 in total rollovers per beneficiary.

There’s a catch inside that fourth rule. Your own Roth contributions share that same annual limit, so they eat into the rollover room. Picture a year where the beneficiary adds money on their own: $3,000 of their own dollars leaves only $4,500 of headroom to roll that year.

That sixth constraint: you can only roll up to your earned income for the year — wages or self-employment income, not gifts, loans, or investment returns. No earned income, no rollover that year; earn less than the limit, and you roll less, with the unused lifetime cap waiting for a future year.

So a 529 with $40,000 left after college can move $7,500/yr into the beneficiary’s Roth IRA, emptying $35,000 of it over roughly five years.

What this means in dollars

Two numbers make the stakes concrete — one for getting it wrong, one for getting it right.

Getting it wrong is the penalty Maya was bracing for. A non-qualified withdrawal owes income tax plus a 10% penalty, but only on the earnings portion, pro-rata, never on the contributions. If a $10,000 account is $6,000 contributions and $4,000 growth, a full non-qualified withdrawal triggers tax and penalty on the $4,000 growth portion; the $6,000 of contributions comes out clean. At a 22% bracket that’s about $880 in tax plus a $400 penalty — roughly $1,280 gone on a rule that no longer forces her hand.

Getting it right is the rollover. Maya’s $35,000 of lifetime rollover is five years of Roth contributions she couldn’t otherwise afford, landing in her lowest-tax years. Rolled in her mid-twenties and left alone, that grows to roughly $500,000 by 65 at a 7% real return — the same math the rest of this site runs on, where a dollar invested at 25 becomes about $15 by retirement. The dollars her grandparents set aside for tuition become the most flexible retirement money she’ll ever hold.

Your move as the leftover-529 beneficiary

You graduated, used some of the 529, and there’s a balance left. Here’s the sequence, and the order matters.

Open the Roth IRA first — today if you can. The rollover can’t open the Roth for you; it can only move money into one that already exists. Opening it now also starts the Roth’s own five-year clock, which runs independently of the rollover, so there’s no reason to wait. If you’ve never opened one, the IRA plans guide walks the account-opening flow.

Confirm the 15-year clock. When was the 529 opened? If it’s been open ≥15 years and the contributions you’d roll are ≥5 years old, the door is open. If it isn’t yet, sit tight — don’t move the account to a new provider chasing lower fees, because that may restart the clock.

Have the conversation with the owner. This is the real friction. Your parents or grandparents own the account, so they have to initiate the rollover — a direct trustee-to-trustee request to the 529 administrator, naming your already-open Roth IRA. If the owner doesn’t know the rule exists, you may need to bring this guide to the conversation.

Check your earned income. You can only roll up to the lower of your earned income for the year and the IRA limit ($7,500 in 2026). A year with no wages is a year with no rollover.

Plan the runway. $35,000 lifetime is roughly five years at full IRA limits. Start early — these are the years you’re in your lowest brackets and can least afford to max a Roth on your own.

What’s left after the cap

The $35,000 cap won’t drain a large balance on its own, and not everyone has the earned income to roll. When there’s money left over, the options run roughly in this order — penalty last, never first:

• Change the beneficiary to a sibling, cousin, future child, or grandchild. The IRS allows changes within the family tree without tax, and the account can sit and compound for decades waiting for the next person who needs it.
• Fund graduate school — same plan, same tax-free treatment.
• Pay off student loans — up to $10,000 lifetime per beneficiary, plus another $10,000 per sibling.
• Last resort: a non-qualified withdrawal. You’d owe income tax plus the 10% penalty on the earnings portion — the cost from the section above. Sometimes still the right call, depending on the math, but only after the family-tree exits are exhausted.

If you’re starting one

If you’re a parent or grandparent funding a 529 for a kid, the account works the same way — you’re just on the owner’s side of it now.

There’s no annual federal cap on contributions, only the gift-tax framework (anyone can give up to $19,000 per recipient per year without filing a gift-tax return) and a state-set lifetime aggregate.

A few decisions do most of the work:

• Pick a low-cost plan. You don’t have to use your own state’s. Utah, New York, California, and Nevada plans are commonly recommended for low expense ratios and broad fund choice, unless your state offers a meaningful income tax deduction tied to using its plan. (Texas and a handful of other states have no state income tax, so that lever doesn’t apply there.)
• Use the age-based portfolio. Most plans offer one; it shifts from stocks to bonds automatically as the kid nears college age. Set it and forget it.
• Don’t over-fund. Aim near the cost of in-state public tuition. The Roth rollover is a $35,000 safety valve for a modest over-shoot, but a $200K leftover isn’t recoverable through it — beneficiary changes (sibling, cousin, future grandchild) are the backstop for a big over-fund.
• Let relatives chip in. Most plans have a gifting portal family can use for birthdays and holidays — it compounds for decades, and a working teen should still have their own Roth IRA alongside the 529, not one instead of the other.

One more thing the 529 now covers: K–12 tuition at public, private, or religious schools, up to $20,000 per beneficiary per year as of 2026 (raised from $10,000 by the One Big Beautiful Bill Act). If private K-12 is in your family’s plan, the account reaches further than it used to.

Where this fits in the order of operations

In our Money Order of Operations, saving for kids’ college is Step 7 — after your own retirement is on a 15% track. The order isn’t arbitrary: you can borrow for college; you cannot borrow for retirement.

For the young-adult beneficiary, the rollover flips the script. It isn’t a new step at all — it’s a path straight to Step 5 (max your Roth IRA), funded by money someone else already set aside for you.

Back to Maya

Maya opens her Roth IRA this month, which starts its own five-year clock running today. She calls her grandmother to explain the rule and ask her to start the trustee-to-trustee transfer. Next year, with wages on her W-2 to cover it, the first $7,500 moves from the 529 into her Roth — and the year after that, and so on until the balance is gone.

The account her grandparents opened when she was eight becomes the most flexible retirement money she’ll ever have. Not because anyone planned it that way; the rule didn’t even exist when they opened it. She just found out the door was there before she walked away from it.