How a 529 Plan Works: Rules, Flexibility, and Common Questions

Key points

• A 529 plan is an education savings account. Growth and withdrawals for qualified education expenses are free of federal income tax, and many states add a tax deduction.

• It covers far more than college tuition: room and board, books, computers, K-12 expenses up to $20,000 a year starting in 2026, apprenticeships, credential programs, and up to $10,000 of student loan repayment.

• Each account has one beneficiary at a time. You can change the beneficiary to another family member without tax, so one account can serve several people one after another, but not at the same time.

• Unused money isn't stuck: under conditions, up to $35,000 can be rolled into the beneficiary's Roth IRA over their lifetime.

• A 529 can still make sense a few years before college, and it can be used at many universities abroad.

My two 529 accounts, one for each of my kids, are with Illinois's plan, because I lived in Chicago when I opened them. I wrote about why I'm not contributing to them right now, and how I think about college versus retirement, in Saving for Retirement or Your Kids' College: Which Comes First?. This post is about the account itself: how it works, what it can pay for, and how flexible it really is.

What a 529 Plan Is

A 529 plan is a state-sponsored education savings account, named after the section of the tax code that created it (IRS). Two roles matter:

• The account owner, usually a parent or grandparent, controls the account: how it's invested, when money comes out, and who the beneficiary is.

• The beneficiary is the student the money is for. It can be your child, a grandchild, another relative, or even yourself.

You don't have to use your own state's plan. You can open a plan from almost any state, and you can keep it if you move. The main reason to look at your own state first is its tax deduction, covered below.

The Tax Benefits

• Federal: money in a 529 grows without yearly tax, and withdrawals for qualified education expenses are tax-free (IRS). There's no federal deduction for contributions.

• State: many states give a state income tax deduction or credit for contributions, often only for their own state's plan. Some, like California, don't offer one at all. Check your state's rules.

What a 529 Can Pay For

College and other postsecondary schools (IRS):

• Tuition and fees.

• Books, supplies, and required equipment.

• Computers, software, and internet access used by the student.

• Room and board, if the student is enrolled at least half-time, generally up to the school's cost-of-attendance allowance or the actual cost of on-campus housing.

• Expenses for a student with special needs.

Beyond traditional college:

• K-12: up to $20,000 per student per year starting in 2026, up from $10,000. Since July 2025, it covers more than tuition, including curriculum materials, books, tutoring, standardized test fees, and dual-enrollment fees (26 U.S.C. §529). These changes come from the 2025 tax law.

• Registered apprenticeships (IRS) and, since July 2025, recognized postsecondary credential programs, such as professional licenses and certifications (26 U.S.C. §529).

• Student loan repayment: up to $10,000 over the beneficiary's lifetime, plus up to $10,000 for each of the beneficiary's siblings (IRS).

Not every state follows the federal K-12 and credential changes, so a withdrawal that's tax-free federally could still be taxed by your state. California, for example, doesn't treat K-12 withdrawals as qualified for state tax (FTB). Check your plan.

Transportation, health insurance, and general living costs outside room and board generally don't qualify. You also can't use the same expenses for both a 529 withdrawal and an education tax credit, and student loan interest paid with tax-free 529 money can't also be deducted (IRS).

A practical note: take withdrawals in the same tax year as the expenses they pay for, and keep receipts. The plan reports each withdrawal on Form 1099-Q, and you need records showing it went to qualified expenses (IRS).

Can I use a 529 for a university abroad?

Yes, if the school participates in U.S. federal student aid programs (IRS). Many universities abroad do. You can check a school by searching for its Federal School Code on StudentAid.gov. A study-abroad semester through an eligible U.S. school also qualifies. At a foreign school without a Federal School Code, withdrawals aren't qualified.

One Beneficiary at a Time: Changing It and Sharing It

Each 529 account has one beneficiary at a time, and withdrawals are meant for that person's qualified expenses. That has practical consequences:

• Kids in college at the same time: give each child their own account. One account can't pay for two students in the same period.

• Kids in college at different times: one account can serve them one after another. You change the beneficiary to the next child when the first one is done.

• Opening an account before there's a beneficiary in mind: you can open a 529 with yourself as the beneficiary and change it to your child later.

Changing the beneficiary is tax-free if the new beneficiary is a member of the current beneficiary's family (IRS). That includes children and their descendants, stepchildren and foster children, siblings and step-siblings, parents and stepparents, aunts and uncles, nieces and nephews, first cousins, in-laws, and the spouses of these relatives; Pub 970 has the full list (IRS). If you might use the Roth rollover described below, note that a beneficiary change may restart its 15-year clock. A change to someone outside that circle is treated as a withdrawal that isn't for education, which is taxed as described below.

Passing it on: because the beneficiary can change, the same account can later go to a grandchild, as long as they're a member of the current beneficiary's family. Most plans also let the owner name a successor owner, who takes over the account if the owner dies. Check how your plan handles this.

If the Money Isn't Used for Education

A withdrawal that isn't for qualified education expenses isn't a disaster, but it costs something. Each withdrawal is split proportionally between your contributions, which come back tax-free, and earnings, which are taxed as income plus a 10% penalty (IRS). The penalty doesn't apply in some cases: when the beneficiary receives a tax-free scholarship (up to the scholarship amount), attends a U.S. military academy, becomes disabled, or dies, or when the expenses were used for an education tax credit instead. Income tax on the earnings still applies in those cases.

Your state can add its own cost. California, for example, adds a 2.5% tax on the earnings of a non-qualified withdrawal (FTB), and states that gave you a deduction may take it back.

Rolling unused money into a Roth IRA

Since 2024, unused 529 money can move into a Roth IRA for the beneficiary, under these conditions (26 U.S.C. §529).

• The Roth IRA belongs to the beneficiary, not the account owner.

• Lifetime limit: $35,000 per beneficiary, across all rollovers.

• The 529 must have been maintained for the beneficiary for at least 15 years. The IRS hasn't issued final guidance on whether changing the beneficiary restarts that clock, so check with your plan before relying on an older account or changing the beneficiary.

• Recent money doesn't qualify: contributions made in the last five years, and the earnings on them, can't be rolled over.

• Yearly limit: each year's rollover counts toward the beneficiary's IRA contribution limit, $7,500 in 2026 (IRS), together with any other IRA contributions they make that year. Reaching $35,000 takes about five years.

• Earned income: the beneficiary needs taxable compensation at least equal to the rollover that year.

• No income limit: the usual Roth IRA income limits don't apply to these rollovers.

• It has to move directly from the 529 plan to the Roth IRA.

• Your state may not follow. California treats the rollover as a non-qualified withdrawal: the earnings are subject to California income tax plus its additional 2.5% tax (FTB).

How a Roth IRA works, and why it's worth having, is covered in Roth IRA or Roth 401(k)? How They Differ and Which One to Fund First.

How Much You Can Put In

• No federal yearly limit, but contributions count as gifts to the beneficiary. Most people keep yearly contributions within the annual gift tax exclusion, $19,000 per beneficiary in 2026 (IRS), to avoid paperwork.

• Front-loading: you can put in up to five years' worth of the exclusion at once, $95,000 per beneficiary in 2026, or $190,000 for a married couple, and spread it over five years for gift tax purposes. This requires filing a gift tax return (Form 709), and if you die within the five years, part of the amount can count toward your estate (26 U.S.C. §529). This is an advanced move; check with a tax professional.

• Each plan sets a lifetime maximum balance per beneficiary, often several hundred thousand dollars.

• Anyone can contribute, including grandparents and other relatives.

How a 529 Affects Financial Aid

On the FAFSA, the federal financial aid application, a 529 owned by a parent counts as a parent asset, which has a much smaller effect on aid than student assets. A 529 owned by a grandparent isn't reported. Many private colleges also use their own form, the CSS Profile, which can count 529s differently, including grandparent-owned ones. I cover how this compares with retirement accounts in Saving for Retirement or Your Kids' College: Which Comes First?

Is It Too Late If My Child Starts College Soon?

Not necessarily. If your child starts college in two to four years:

• A state tax deduction can still be worth it, even if the money is spent soon. Check whether your state has rules on how soon money can come out after you contribute and still keep the deduction.

• There's less time for tax-free growth, so the main benefit is the deduction and tax-free withdrawals, not decades of compounding.

• College usually lasts several years, so money added now can still grow until the later years, or for graduate school or a younger sibling.

• Shorter time, more conservative investments. Many plans offer age-based portfolios that shift toward safer investments as college approaches.

Pros and Cons

Here's how the main advantages and drawbacks of a 529 plan compare, side by side.

Sources: IRS Publication 970; 26 U.S.C. §529; IRS, 2026 IRA limit.

How to Think About It

• If your own retirement savings are on track, a 529 is a tax-efficient way to save for education.

• If your state offers a deduction, start by comparing your own state's plan with others. Either way, compare plans on fees and investment options, not only on tax benefits.

• If you have more than one child who may be in school at the same time, a separate account for each keeps things simple.

• If you're worried the money won't be used, remember the options: changing the beneficiary, the Roth rollover, and penalty exceptions such as scholarships.

• If college is only a few years away, focus on the state deduction and conservative investments.

Summary

A 529 plan lets education savings grow and come out tax-free for a wide range of expenses, from college and K-12 to apprenticeships, credentials, and some student loans, and it can be used at many universities abroad. Each account has one beneficiary at a time, but that beneficiary can change within the family, and unused money can partly move to a Roth IRA. Check your state's rules on deductions and on the newer federal changes before you open or use one.

FAQs

What can a 529 plan pay for? College tuition, fees, books, computers, and room and board for at least half-time students; K-12 expenses up to $20,000 a year starting in 2026; apprenticeships and credential programs; and up to $10,000 of student loan repayment over the beneficiary's lifetime (IRS; 26 U.S.C. §529).

Can one 529 account be used for two children? Yes, one after another, by changing the beneficiary. Not at the same time: an account has one beneficiary at a time, so children in school at the same time are better served by separate accounts.

Can I change the beneficiary of a 529? Yes, tax-free, if the new beneficiary is a member of the current beneficiary's family, which includes siblings, children, cousins, and in-laws (IRS).

Can I use a 529 for a university abroad? Yes, if the school participates in U.S. federal student aid programs. Check for its Federal School Code on StudentAid.gov.

What happens to unused 529 money? You can change the beneficiary, roll up to $35,000 over the beneficiary's lifetime into their Roth IRA under strict conditions, or withdraw it. A non-qualified withdrawal taxes the earnings and adds a 10% penalty, with exceptions such as scholarships (IRS).

Is it too late to open a 529 if college starts in a few years? Not necessarily. A state tax deduction and tax-free withdrawals can still make it worthwhile, even with little time for growth.

Transparency Note: I'm the human behind the keyboard — the ideas, stories, and decisions here are mine. I collaborate with AI throughout the writing process: brainstorming, drafting, smoothing out grammar and flow, assisting with research, and creating the visuals you see throughout my posts.

Disclaimer: The information provided in this blog post is for educational and informational purposes only. I am an AFC® (Accredited Financial Counselor) Candidate, not a Certified Financial Planner (CFP®), Certified Public Accountant (CPA), tax advisor, attorney, or Investment Adviser Representative (IAR). The content herein is not intended to be a substitute for investment, tax, or legal advice from a licensed professional. Always seek the advice of a qualified professional with any questions you may have regarding your individual financial situation. The opinions expressed are my own and do not represent the views of my current or former employer.