529 College Savings Plans: State Tax Deductions, Rollovers, and the SECURE 2.0 Roth Rollover

If you're saving for a child's college education, the 529 plan is the single most tax-advantaged account available to most American families. Earnings grow tax-deferred, withdrawals are tax-free when used for qualified education expenses, and roughly 35 states offer a state tax deduction or credit on top. Recent changes — the $10,000-per-year K-12 expansion in 2018, the $10,000 student-loan repayment provision in 2019, and the SECURE 2.0 provision allowing up to $35,000 of unused 529 funds to roll into a Roth IRA starting in 2024 — have turned what used to be a fairly rigid account into a flexible, multi-purpose savings vehicle. This guide walks through what 529s are, how the tax treatment works, the qualified expenses, the 2024 rule changes, and the strategies that make a real dollar difference.

What is a 529 plan?

A 529 plan is a state-sponsored, tax-advantaged investment account designed to encourage saving for education. The name comes from Section 529 of the Internal Revenue Code (IRC §529), which authorizes "qualified tuition programs." The first 529 plans were created in 1996, when Congress added §529 to the code via the Small Business Job Protection Act. They replaced earlier "state prepaid tuition" plans that had been authorized by §529's predecessor provisions in the Deficit Reduction Act of 1984.

Every U.S. state now offers at least one 529 plan, and you can enroll in any state's plan regardless of where you live. The state sponsor sets the rules for investment options, fees, and any state tax incentives. The federal tax treatment — tax-free growth and tax-free qualified withdrawals — is the same regardless of which state's plan you use. The IRS describes the program in detail on its 529 Plans: Questions and Answers page.

A 529 is a custodial account with a single account owner and a single beneficiary. The account owner (typically a parent or grandparent) controls the account, decides when to take distributions, and can change the beneficiary at any time. The beneficiary (typically the child) is the person for whose benefit the funds are intended. There's no income limit for contributions and no annual contribution cap, but contributions are considered gifts for federal gift tax purposes (so the $18,000 annual gift exclusion in 2024 applies, with a special 5-year election that lets a couple front-load up to $180,000 in a single year). Each state also sets a lifetime contribution cap, typically $300,000–$550,000 per beneficiary.

Savings plans vs. prepaid tuition

There are two types of 529 plans:

1. Savings plans work like a 401(k) for college. You contribute after-tax dollars, choose from a menu of investment options (typically age-based target-enrollment portfolios and a selection of index funds), and the account grows tax-deferred. Withdrawals are tax-free if used for qualified education expenses. As of 2024, total 529 savings plan assets exceed $450 billion across more than 16 million accounts, with an average balance of about $28,000.

2. Prepaid tuition plans let you lock in today's tuition rates at participating in-state public colleges. You buy "tuition units" or "credits" now, redeemable later for tuition at the locked-in rate. If the beneficiary attends a non-participating school, the plan typically pays out an equivalent amount based on average in-state tuition. Prepaid plans are offered by about a dozen states (Florida, Maryland, Massachusetts, Michigan, Mississippi, Nevada, Pennsylvania, Texas, Virginia, Washington, and others) and by the Private College 529 Plan, a consortium of about 200 private colleges.

Prepaid plans have declined in popularity over the past decade because tuition increases have slowed and investment markets have boomed. For most families today, the savings plan is the better default choice. The exception is a family with strong in-state public college preference and certainty that the beneficiary will attend a participating school.

Tax treatment: federal and state

The tax treatment of 529 plans has three layers: federal contribution, federal growth, and state tax.

Federal contribution: Contributions are made with after-tax dollars. There is no federal tax deduction for contributions. This is the key difference from a Traditional IRA or 401(k), and it's the reason most financial planners describe 529s as "tax-free growth, not tax-deductible contributions."

Federal growth: Earnings grow tax-deferred inside the account. No capital gains tax, no dividend tax, no tax on rebalancing. Over an 18-year horizon, tax-free compounding can add tens of thousands of dollars compared to a taxable brokerage account.

Federal qualified withdrawals: Withdrawals used for qualified education expenses are 100% tax-free at the federal level — no income tax on the earnings portion. This is the major benefit. Without it, the 529 would be just a tax-deferred account like a non-deductible IRA.

State tax: States vary widely. About 35 states (plus the District of Columbia) offer a state income tax deduction or credit for 529 contributions. Most restrict the deduction to contributions made to that state's plan, but a handful — including Arizona, Arkansas, Kansas, Minnesota, Missouri, Montana, and Pennsylvania — allow deductions for contributions to any state's 529. Seven states have no income tax at all (Alaska, Florida, Nevada, South Dakota, Texas, Washington, Wyoming) and therefore no state tax benefit. California offers no state deduction for 529 contributions despite having a state income tax.

Qualified expenses: tuition, fees, books, room & board

For withdrawals to be tax-free, they must be used for qualified higher education expenses (QHEE) at an eligible institution. IRC §529(e)(3) defines QHEE to include:

• Tuition and fees at any eligible post-secondary institution — including community colleges, trade schools, and most foreign institutions that participate in U.S. federal student aid programs.
• Books, supplies, and equipment required for enrollment or attendance.
• Room and board — but only up to the lesser of (a) the school's posted cost of attendance for room and board, or (b) the actual amount charged if the student lives in school-owned housing. For off-campus students, the school's posted "cost of attendance" figure is the cap.
• Computer technology, peripherals, software, and internet access used primarily by the beneficiary during enrollment.
• Special needs services for a beneficiary with special needs.

"Eligible institution" is broad: it includes any college, university, vocational school, or other post-secondary educational institution eligible to participate in federal student aid programs under Title IV of the Higher Education Act. That covers essentially every accredited U.S. college and many foreign institutions. Savingforcollege.com maintains a searchable database of eligible schools.

Keep receipts and the school's published cost-of-attendance figures for the year withdrawals are made. The IRS can request documentation of how 529 withdrawals were used. Best practice: deposit 529 distributions into a separate checking account dedicated to education expenses, and pay qualified expenses directly from that account. The paper trail will save headaches if the IRS ever asks.

K-12 expansion and student loan repayment

Two legislative changes expanded what counts as a qualified expense:

K-12 tuition (TCJA 2017). The Tax Cuts and Jobs Act of 2017 expanded QHEE to include up to $10,000 per year per beneficiary in tuition at a public, private, or religious elementary or secondary school. The $10,000 is per beneficiary, not per contributor — so if two sets of grandparents each have a 529 for the same child, the combined K-12 limit is still $10,000/year.

Student loan repayment (SECURE Act 2019). The Setting Every Community Up for Retirement Enhancement (SECURE) Act of 2019 added a lifetime cap of $10,000 in 529 distributions to repay qualified education loans for the beneficiary or the beneficiary's sibling. The $10,000 is a lifetime limit per beneficiary, not per year, and applies separately to each sibling.

Worked example: Your daughter graduates with $30,000 in federal student loans. You can take a $10,000 tax-free distribution from her 529 to pay down the principal. The remaining $20,000 must be repaid from other sources, but the $10,000 from the 529 saves the federal income tax and the 10% penalty that would otherwise apply to non-qualified withdrawals. If her younger brother also has student loans, you can take another $10,000 from his 529 — the lifetime cap is per beneficiary.

SECURE 2.0: the Roth IRA rollover (effective 2024)

The biggest recent change to 529 plans is the SECURE 2.0 Act of 2022, which created a new pathway for unused 529 funds. Starting January 1, 2024, you can roll over up to $35,000 lifetime from a 529 into a Roth IRA owned by the beneficiary, penalty- and tax-free. The conditions:

• The 529 account must have been open for at least 15 years.
• Contributions made within the last 5 years (and their earnings) are not eligible.
• The beneficiary of the 529 must be the same as the owner of the Roth IRA.
• The $35,000 limit is a lifetime limit per beneficiary.
• Rollovers are still subject to the annual Roth IRA contribution limit ($7,000 in 2024 for under-50). So you'd typically roll ~$7,000 per year for 5 years to use up the $35,000.
• The beneficiary's income must be within Roth IRA limits for the year (single filer with modified AGI under $161,000 in 2024; married joint under $240,000).

This change addressed the long-standing criticism that 529 plans were too rigid: if your child didn't go to college, you were stuck with penalties or scrambling to find another qualified beneficiary. The Roth rollover provides a clean escape valve.

Worked example: You opened a 529 for your son in 2009. By 2024, when he's 18, the account has $50,000 — but he's gotten a full-ride scholarship and doesn't need the money. Under the old rules, you'd have to either (a) change the beneficiary to another family member, (b) take a non-qualified withdrawal and pay income tax + 10% penalty on earnings, or (c) leave the money indefinitely. Under SECURE 2.0, you can roll $35,000 into a Roth IRA in his name ($7,000/year for 5 years starting in 2024, 2025, 2026, 2027, 2028) and use the remaining $15,000 for another qualified purpose — perhaps a future graduate degree, or by changing the beneficiary to a younger sibling.

Worked example: starting at birth vs. starting at age 10

The single most powerful variable in 529 planning is time. Consider two families, each saving $250/month for college, each earning a 7% average annual return:

Family A contributes 2.25× as much as Family B but ends up with 3.2× the money — and earnings are 5.5× higher. The difference (about $75,000) is the power of compounding over 18 years versus 8.

Now let's compare the cost of paying for college from a 529 versus from taxable savings or from student loans:

Funding from a 529 saves roughly $2,250 in taxes compared to taxable savings, and roughly $15,000 in interest compared to loans. Add the years of tax-free growth on contributions, and a 529 can be worth $20,000–$50,000 more than the alternatives for the same out-of-pocket contribution.

State tax deductions: which states offer them

State tax treatment is where the real planning opportunity lies. As of 2024, roughly 35 states (plus D.C.) offer a state income tax deduction or credit for 529 contributions:

• States with deductions capped at a specific amount — e.g., New York ($5,000 single / $10,000 joint), Illinois ($10,000 single / $20,000 joint), Virginia ($4,000 per account), Pennsylvania ($18,000 single / $36,000 joint per beneficiary), Ohio ($4,000 per beneficiary).
• States with credits — e.g., Indiana (20% credit up to $1,500), Minnesota (matching contribution up to $700), Utah (4.65% credit up to $87 for single / $174 joint per beneficiary).
• States with no income tax (Alaska, Florida, Nevada, South Dakota, Texas, Washington, Wyoming) — no state tax benefit, but the federal tax-free growth still applies.
• States with income tax but no 529 deduction — California is the largest. Also: North Carolina, New Jersey (no deduction but offers a matching grant for low-income families), Delaware, Hawaii, Kentucky.

For residents of states that require using the in-state plan (most of them), the decision is simple: use your own state's plan and capture the deduction. For residents of states that allow deductions for any state's plan (Arizona, Arkansas, Kansas, Minnesota, Missouri, Montana, Pennsylvania), shop based on fees and investment quality. Utah's my529 and New York's 529 Direct are routinely ranked among the best low-cost plans by Savingforcollege.com.

A common tax-saving tactic: even if your state's plan is mediocre, the state tax deduction can outweigh the fee difference. Example: A New York couple in the 6.85% state bracket contributing $10,000/year saves $685 in state tax. If the in-state plan charges 0.20% more in fees than a competing plan, the annual fee drag on a $50,000 balance is $100. The deduction wins easily — and the gap widens as the balance grows, since the deduction is per-year while the fee drag scales with assets.

Grandparent 529s and the FAFSA change

For decades, grandparent-owned 529 plans created a FAFSA problem. Under the old FAFSA rules, distributions from a grandparent-owned 529 counted as "untaxed income" to the student, which reduced financial aid eligibility by up to 50% of the distribution. A $10,000 grandparent distribution could reduce aid by $5,000.

The Faster FAFSA changes, phased in starting with the 2024-25 award year, eliminated this problem entirely. The new FAFSA (officially the FAFSA Simplification Act, implemented for the 2024-25 cycle) no longer asks about grandparent 529 distributions or other "cash support" from non-parents. Grandparent 529 distributions now have zero impact on federal financial aid eligibility.

The Faster FAFSA also changed the base year. The 2024-25 FAFSA uses tax data from two years prior (2022) instead of one year prior. That means distributions taken in the years covered by the FAFSA look-back — for example, the senior year of high school and the freshman and sophomore years of college — no longer appear on the form when the student applies for aid for the junior and senior years.

For the 2024-25 award year and beyond: a grandparent 529 is one of the best ways to help pay for a grandchild's college. The money is no longer counted against the student on the FAFSA. The grandparent retains control; the beneficiary gets tax-free money for college; and the parents' financial aid is unaffected.

Note that this FAFSA change applies only to the federal aid formula. A small number of private colleges use the CSS Profile, which still asks about grandparent 529 assets. If your grandchild is applying to a selective private school, check that institution's financial aid form before assuming grandparent distributions are invisible.

Changing beneficiaries and rollovers

One of the most useful features of a 529 is its flexibility in changing beneficiaries. You can change the beneficiary at any time without tax consequences, as long as the new beneficiary is a "member of the family" of the old beneficiary, as defined in IRC §529(e)(2). That includes:

• Siblings, half-siblings, and step-siblings
• Children, grandchildren, and step-children
• Parents, grandparents, and step-parents
• Aunts, uncles, nieces, nephews, and first cousins
• Spouses of any of the above
• The account owner themselves or their spouse

You can also roll over funds from one 529 to another, with the same family-member restriction. The IRS limits rollovers to one per 12-month period per beneficiary, but this is easily avoided by changing the beneficiary instead of rolling over.

Strategically, this means a 529 is rarely "wasted." If your oldest child doesn't need the money, you can move it to a younger sibling. If neither child needs it, you can roll up to $35,000 to a Roth IRA in the beneficiary's name. If you have leftover funds after both kids finish school, you can name yourself as beneficiary and use it for your own continuing education. The combination of beneficiary changes and the Roth rollover makes the "use it or lose it" fear of 529 plans largely obsolete.

Penalties for non-qualified withdrawals

If you take a non-qualified withdrawal — meaning you use the money for something other than QHEE — the earnings portion of the distribution is subject to federal income tax at your ordinary rate plus a 10% additional tax under IRC §529(c)(6). The principal portion comes back tax-free (since contributions were made with after-tax dollars).

Example: You have a 529 with $30,000 in contributions and $20,000 in earnings ($50,000 total). You take a $10,000 non-qualified distribution. The prorated earnings portion is $4,000 (40% of $10,000). At a 22% federal marginal rate plus 10% penalty, you owe $4,000 × 32% = $1,280 in tax. You receive $8,720 net.

Exceptions to the 10% penalty (but not the income tax) include:

• The beneficiary's death or disability
• The beneficiary receives a tax-free scholarship, Veterans' educational assistance, or employer assistance — the penalty is waived up to the amount of the tax-free benefit
• The beneficiary attends a U.S. service academy — penalty waived up to the academy's cost of attendance

State tax may also apply. Most states that granted a deduction for contributions will "recapture" that deduction on non-qualified withdrawals. If you took a $5,000 state deduction in 2022 and took a non-qualified withdrawal in 2024, the state may add the $5,000 back to your 2024 taxable income. Check your state's specific recapture rules before taking a non-qualified distribution.

Takeaways

For most American families with college-bound children, a 529 plan is the right primary savings vehicle. The combination of tax-free growth, tax-free qualified withdrawals, and state tax deductions creates a cumulative advantage of $20,000–$50,000 over alternatives for the same out-of-pocket contribution. The 2017–2024 legislative changes — K-12 expansion, student loan repayment, and the Roth IRA rollover — have made the account flexible enough that leftover funds are no longer a major concern. If you're a grandparent, the 2024-25 FAFSA changes mean a grandparent 529 is now one of the cleanest ways to help pay for a grandchild's college without affecting financial aid. The two decisions that matter most: (1) start early — compounding over 18 years versus 8 years more than doubles the result; (2) capture your state tax deduction if your state offers one.