A parent on r/personalfinance last week posted that their youngest daughter graduated debt-free, leaving roughly $35,000 sitting in a 529 plan opened when she was in kindergarten. Cashing it out means income tax on the earnings plus a 10% penalty on the growth. Rolling to a sibling has no takers. What almost nobody in that thread mentioned: the account has been open long enough to unlock the single most valuable feature in SECURE 2.0.
Rolled correctly, that $35,000 becomes roughly $524,000 in a Roth IRA by the beneficiary’s age 62. The math is straightforward, but families often trip on the execution.
The Rule That Rewrites the Math
The 529-to-Roth rollover has four gates. The 529 must have been open at least 15 years. Contributions (and their earnings) from the last five years are not eligible. Annual rollovers are capped at $7,500 for 2026, mirroring the Roth IRA contribution limit. And the lifetime maximum is $35,000 per beneficiary.
The $35,000 leftover in this scenario is not a coincidence. It matches the lifetime cap exactly. Roll $7,500 per year for roughly five years and the 529 empties into a Roth IRA in the beneficiary’s name with no 10% penalty and no income tax on the earnings. That is the entire mechanic.
The trap that catches most families: the beneficiary must have earned income at least equal to the rollover amount each year. A recent graduate working full-time clears the bar easily. A high schooler with a summer job qualifies only for a partial rollover, stretching the timeline.
Why $35,000 Grows to $524,000
Assume the daughter is 22, taking over the rollovers into her own Roth. By age 27, all $35,000 has moved. She does not touch the account until age 62.
At a 7% average annual return, $35,000 becomes $524,106 in 40 years. That is not an aggressive assumption. SPDR S&P 500 ETF Trust (NYSEARCA:SPY) has returned 240% over the past ten years alone, roughly 13% annualized. Using half that pace as the long-run projection leaves plenty of cushion for the drawdowns a 40-year holding period will absorb.
Compare that against the alternatives. The national average 12-month CD pays nearly 2%. The 10-year Treasury yields nearly 5%. Even at the Treasury rate, the same $35,000 would grow to roughly $220,000 over 40 years, less than half the equity outcome. The Fed’s stable roughly 4% policy rate means those fixed-income yields are not moving materially higher soon.
Where the Strategy Breaks
Three traps deserve attention before starting the paperwork.
- State tax recapture. If the parent claimed a state income-tax deduction on the original 529 contributions, some states claw that deduction back when funds move into a Roth IRA. Verify with the state’s 529 administrator before the first rollover; the recapture can eliminate the tax benefit of the deduction earned years ago.
- Beneficiary-change ambiguity. The IRS has not clarified whether the 15-year clock resets when the beneficiary is changed. Most advisers avoid changing beneficiaries within 15 years of an intended rollover to sidestep the risk. If the goal is to redirect the account to a younger grandchild, keep the original beneficiary and roll to her Roth instead.
- Contribution timing. Any dollars added to the 529 in the last five years, plus their earnings, are frozen out. Pull the account’s contribution history before scheduling the first rollover.
What to Do This Week
- Pull the 529 statement and confirm two dates: the account open date (must be at least 15 years ago) and the last contribution date (nothing from the past five years counts).
- Have the beneficiary open a Roth IRA at the same custodian holding the 529. Same-institution transfers avoid the paperwork errors that cause the IRS to treat rollovers as taxable distributions.
- Schedule five annual rollovers of $7,500 rather than one large request. Exceeding the annual cap disqualifies the excess and can create a 6% excess-contribution penalty inside the Roth.
The 62-year-old handing this down loses no retirement flexibility of their own. Their kid gains 40 years of tax-free compounding on money that was already earmarked for her future.
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