For families who’ve diligently funded 529 plans, an underappreciated challenge often emerges after the beneficiary graduates: what to do with unused 529 funds. 529 plan leftover funds are more common than many families expect. Whether investment performance exceeded expectations and boosted the account balance or a child was awarded a scholarship, chose a less expensive school, or skipped a four-year degree, you will want to give careful thought to what to do with the extra funds.
No single provision of the tax code solves the problem of recovering excess 529 funds without a penalty. The good news is that these funds aren’t trapped. So if you are sitting on an overfunded 529 plan, a comprehensive, multi-strategy approach can help you access the funds in a tax-efficient way. This might include rolling over funds into a Roth IRA or ABLE account, changing the 529 beneficiary to another family member, using the account for graduate school or other qualified education expenses down the road, or withdrawing excess 529 funds for noneducation expenses (which means paying taxes and a 10% penalty on earnings).
The right choice depends on the extra amount, your family’s tax and estate plans, and your long-term wealth goals.
When your 529 surplus exceeds the Roth rollover limit
Before choosing a strategy, it helps to frame the math clearly and understand how the rules apply. Let’s say your child has $250,000 remaining in their 529 plan after graduation, even after covering qualified education expenses. In situations like this, no single provision in the tax code fully solves the challenge of excess 529 assets.
The 529-to-Roth IRA rollover, introduced under the SECURE 2.0 Act, is often the first strategy families consider, and for good reason. But, it’s not a complete solution. With a $35,000 lifetime cap, it typically addresses only a small portion of a larger surplus. That’s why it’s important to look beyond any one approach. In this article, we explore five 529 plan strategies to help families navigate and make the most of a larger-than-expected balance.
1. Taking advantage of the 529-to-Roth-IRA rollover
The SECURE 2.0 Act 529 rollover rule creates a useful option that allows unused 529 funds to roll over directly to a Roth IRA for the beneficiary, and this option can bypass the income limits that often block high earners from contributing. It’s one of the most tax-efficient uses of excess 529 funds for the portion it covers — but it has restrictions.
Rules governing this rollover
- The 15-year rule: The 529 account must have been open for at least 15 years before any rollover can occur.
- The five-year contribution restriction: Contributions made in the last five years and earnings on those contributions aren’t eligible for a rollover.
- Lifetime and annual limits: The rollover is limited to a $35,000 lifetime maximum per beneficiary. Annual rollovers are further capped at the 2026 Roth IRA contribution limits ($7,500 for those under age 50; $8,600 for those 50 and older), meaning the full $35,000 must be transferred over no less than five years.
- Earned income requirement: The beneficiary must have earned income at least equal to the amount being rolled over in that tax year.
- Income limit exemption: The 529-to-Roth-IRA rollover is explicitly exempt from the Roth IRA income limits that normally restrict high earners. A beneficiary earning $400,000 a year can still get this rollover, making this option valuable for families with high-earning children.
Why this matters despite the $35,000 cap
A Roth IRA funded in a beneficiary’s mid-20s has 40-plus years to compound tax-free. Even at a conservative 7% annual growth rate, $35,000 contributed early in a beneficiary’s career can grow to well over $500,000 by traditional retirement age. Viewed through a multigenerational lens and as part of a long-term financial plan, this rollover represents meaningful value even if it addresses only a fraction of the total overage — particularly when it anchors a broader retirement income strategy for your child.
2. Beneficiary cascading 529 plans when there are larger balances
For families with multiple children, grandchildren, or other qualifying family members, the $35,000 lifetime limit can be multiplied through strategic 529 beneficiary changes. The limit applies per beneficiary, not per account. Beneficiary cascading 529 plans across a large family can put major assets to work.
How this works in practice
Suppose you have $200,000 left in a 529 plan. The plan was originally set up for your eldest child. You can roll $35,000 into that child’s Roth IRA over five or more years. You can then make a 529 beneficiary change to a younger sibling and roll an additional $35,000 into that child’s Roth IRA, provided the account has been open for 15 years and all other requirements are satisfied.
The same approach can be repeated for additional children, grandchildren, or other qualifying family members, including, in some cases, the account owner. For a family with three children and two grandchildren, this cascade approach could direct up to $175,000 into Roth IRAs, possibly tax- and penalty-free. It can also jumpstart retirement planning for the next generation.
Important caveat:
3. Multigenerational planning: preserving the 529 account for future generations
One of the most underused 529 plan strategies for substantial balances is keeping the excess 529 funds in the account and letting the plan serve as a multigenerational education vehicle. A 529 plan has no expiration date, so it can stay under active investment management for years, and it can be moved to 529 plans for grandchildren, great-grandchildren, or other family members. This helps meet education needs as they arise and is a key part of smart 529 multigenerational planning.
For ultra-high-net-worth (UHNW) families, generally defined as families having $30 million or more in investable assets, this approach has a particularly compelling estate planning dimension. Assets held inside a 529 plan are typically excluded from the account owner’s taxable estate, yet the owner retains indirect control over the funds and can redirect them at any time.
Unlike an irrevocable trust, a 529 plan allows the contributor to reclaim the principal (subject to taxes and penalties on earnings) if circumstances change. An estate planning attorney can help you assess how a retained 529 balance fits your broader estate structure.
If a grandchild is on the horizon, there may be little urgency to move the funds at all. A well-invested 529 balance today can contribute to a UHNW education savings strategy, potentially supporting future generations’ education costs at private university rates. A well-invested 529 balance today becomes a UHNW education savings strategy with an endowment for the next generation, potentially covering multiple grandchildren’s full education costs at private university rates.
4. Using the funds for additional qualified expenses
Before treating remaining funds as “excess,” it’s worth reviewing the full range of education savings account options — specifically, the qualified education expenses that can be paid from a 529 plan tax-free:
- Graduate and professional school: If your child plans to pursue an MBA, law degree, medical degree, or other advanced education, even years from now, the funds remain fully qualified. Graduate school costs at top programs now regularly exceed $100,000 per year.
- K-12 tuition for younger siblings: Up to $10,000 per year per beneficiary can fund private elementary or secondary school tuition according to SECURE 2.0 Act education provisions. If younger children are still in school, this can draw down the balance meaningfully over time.
- Student loan repayment: Up to $10,000 lifetime per beneficiary (and $10,000 for each of the beneficiary’s siblings) can go toward repaying qualified student loans — a useful outlet if the beneficiary carries any debt from school.
- Apprenticeship programs: Registered apprenticeship programs are qualified expenses, a provision that’s frequently overlooked.
A thorough accounting of upcoming qualified education expenses often reduces the “excess” balance more than families initially anticipate.
5. Nonqualified 529 withdrawals
For balances that exceed what any of the above 529 plan strategies can absorb, consider planning a nonqualified 529 withdrawal. While this type of withdrawal isn’t ideal, proactive tax planning can make the option much more tax-efficient than it seems.
Because your contributions are post-tax, the principal you contributed comes out tax- and penalty-free. For accounts with large contribution bases relative to earnings, which is especially likely when markets have been volatile or the account is relatively young, the actual tax cost may be modest.
Additionally, if the beneficiary is in a lower tax bracket, this can reduce the effective tax rate. This is often true for a child just starting a career. In that case, withdrawing extra 529 funds in the child’s name can greatly lower the effective tax rate. Tax-efficient investing principles apply here: Spreading withdrawals over several years and timing them to lower-income years can minimize the total cost.
If you are in a state that offers a deduction for 529 contributions, you may also have to account for a state tax recapture obligation. Your advisory team can model the true after-tax cost of a nonqualified 529 withdrawal against the alternatives.
529 estate planning — and the 529 plan and estate tax considerations for large balances
Families who super-funded 529 plans — taking advantage of the five-year gift tax election that 529 rules allow and contributing up to $95,000 per beneficiary in a single year in 2026 — should revisit the 529 estate planning implications of their remaining balances.
Because of favorable 529 plan and estate tax rules, a highly overfunded 529 plan can transfer wealth efficiently. It can also support a broader wealth management strategy. This includes estate planning, insurance planning, and retirement planning. Redirecting that 529 balance to grandchildren or later generations through beneficiary changes preserves the estate tax benefit while compounding the educational and financial value for the family.
Putting it all together: a framework for $200,000-$300,000 in excess funds
For a family with $250,000 remaining in an overfunded 529 plan, as an example, a comprehensive approach might look like this.
For a nonqualified 529 withdrawal, only the earnings portion is subject to income tax and the 10% penalty.
| Strategy | Approximate amount addressed |
|---|---|
| 529-to-Roth-IRA rollover for primary beneficiary | $35,000 over 5+ years |
| 529 beneficiary change + rollover for sibling | $35,000 over 5+ years |
| 529 multigenerational planning for grandchildren | $100,000+ retained and invested |
| Graduate school or qualified expenses | $50,000-$80,000 depending on plans |
| Nonqualified 529 withdrawal if needed | Remainder, spread over low-income years |
The optimal allocation depends on your family’s specific circumstances — the ages of children and grandchildren, income levels, estate size, and long-term legacy intentions.
Connecting with your advisory team
Navigating 529 plan leftover funds requires wealth management coordination across education planning, investment management, retirement planning, tax planning, and estate planning, and the right answer for your family depends on factors that interact in ways that are not always clear. This can be more complex when several beneficiaries, state tax rules, and 529 plan and estate tax issues apply.
That’s why integrated financial planning — with one financial team that understands your complete picture — can make a measurable difference. As a fiduciary RIA firm, Mercer Advisors brings your wealth advisor, tax professionals, and estate planning support together, and we deliver the financial planning solutions your distinct situation requires.
If you have a significantly overfunded 529 plan, our wealth management team can help.
We can model your education savings options. We can sequence 529 plan strategies. And we can execute a long-range financial plan that will align with your financial life planning goals.
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To roll over funds from a 529 plan to a Roth IRA, the 529 account must have been open for at least 15 years. You can transfer a lifetime maximum of $35,000 per beneficiary, but the transfers are subject to annual Roth IRA contribution limits ($7,500 in 2026 for those under 50). Additionally, the beneficiary must have earned income equal to or greater than the rollover amount for the year, and contributions made within the last five years cannot be transferred.
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The $35,000 lifetime limit applies to the specific beneficiary of the 529 plan, not the account owner. Because you are restricted by the annual Roth IRA contribution limits, it will take several years to reach the full $35,000 maximum. If you change the beneficiary of the 529 plan to another qualifying family member, that new beneficiary may also be eligible for a separate $35,000 lifetime limit.
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The right choice depends on your family’s educational and financial goals. If you have another family member who plans to attend college or private school, changing the beneficiary is often the simplest way to use the funds for the intended tax-free purpose. If all educational needs are met, rolling the funds into a Roth IRA could be a beneficial strategy for a beneficiary’s retirement savings, as it may offer tax advantages.
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Yes, it can be highly beneficial. Because 529 plan assets grow tax-deferred and Roth IRAs offer tax-free growth and withdrawals, this strategy preserves the tax advantages of your wealth. Even though it takes several years to move the maximum $35,000 because of annual contribution limits, the long-term compounded growth inside a Roth IRA can create a significant financial asset for your beneficiary’s future.
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A wealth advisor can help you integrate 529 plan strategies into your broader estate and tax planning. At Mercer Advisors, our teams coordinate investment management, tax, and estate planning to help ensure that strategies like the 529-to-Roth-IRA rollover align with your multigenerational wealth transfer goals. Contact your advisor to review your specific account history and eligibility.
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To initiate a rollover, you must request a direct trustee-to-trustee transfer from your 529 plan administrator to the beneficiary’s Roth IRA custodian. The Roth IRA must be established in the name of the 529 plan beneficiary. It is highly recommended to consult with your financial advisor and tax professional before initiating the transfer to ensure all 15-year holding periods and earned income requirements are properly documented.
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A 529-to-Roth-IRA rollover allows you to move up to $35,000 of unused education savings into a retirement account without paying taxes or penalties, preserving the tax-advantaged status of the funds. In contrast, a nonqualified withdrawal means you take the cash out for noneducational purposes. With a nonqualified withdrawal, the earnings portion of the distribution is subject to ordinary income tax plus a 10% penalty, which can significantly reduce the value of your accumulated wealth.
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A 529-to-Roth-IRA rollover counts toward the beneficiary’s annual Roth IRA contribution limit. For example, if the limit is $7,500 and you roll over $7,500 from a 529 plan, the beneficiary cannot make additional regular contributions to the Roth IRA that year. However, unlike regular Roth IRA contributions, the 529 rollover is not restricted by the beneficiary’s modified adjusted gross income (MAGI) limits, making it a valuable tool for high-earning beneficiaries who might otherwise be phased out of direct Roth contributions.
All expressions of opinion reflect the judgment of the author as of the date of publication and are subject to change. Some of the research and ratings shown in this presentation come from third parties that are not affiliated with Mercer Advisors. The information is believed to be accurate but is not guaranteed or warranted by Mercer Advisors. Content, research, tools and stock or option symbols are for educational and illustrative purposes only and do not imply a recommendation or solicitation to buy or sell a particular security or to engage in any particular investment strategy. Hypothetical examples are for illustrative purposes only.
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