A 529 plan is a tax-advantaged savings account designed for education expenses. You contribute after-tax dollars, the money grows tax-free, and withdrawals are also tax-free when used for qualified education expenses. No federal income tax applies at any point on the growth, as long as the money is used as intended.
Tax Advantages
Contributions to a 529 are made with after-tax money, so there is no federal deduction on the way in. The advantage is on the growth and withdrawal side. Investment gains in a 529 are never subject to federal income tax if used for qualified expenses. In many states, contributions also receive a state income tax deduction or credit, which can meaningfully improve the math.
For example, a state offering a 5% income tax deduction on up to $10,000 in 529 contributions per year saves you $500 in state taxes. Over 18 years, that adds up.
Qualified Expenses
Qualified expenses include:
- Tuition, fees, and room and board at accredited colleges and universities
- K-12 tuition up to $10,000 per year (federal law; state treatment varies)
- Apprenticeship programs registered with the Department of Labor
- Student loan repayment up to $10,000 (lifetime limit per beneficiary)
- Computers and technology required for enrollment
Non-qualified withdrawals are subject to income tax plus a 10% penalty on the earnings portion only, not the principal you contributed.
Who Can Contribute
Anyone can contribute to a 529 on behalf of a beneficiary: parents, grandparents, aunts, uncles, family friends. There is no income limit for contributions. Contribution limits are set by each state and are generally high (many states allow over $300,000 total per beneficiary). Annual gift tax exclusion rules apply: in 2025, each contributor can give up to $18,000 per year without triggering gift tax reporting.
A notable change under recent FAFSA rules: grandparent-owned 529 accounts no longer count against financial aid eligibility under the simplified FAFSA. This removed one of the main reasons grandparents hesitated to use 529s directly.
What Happens to Unused Funds
Previously, unused 529 funds represented a real concern: overfund a plan and you face taxes plus a penalty to get the money out. Several options now exist:
- Change the beneficiary to another family member (sibling, cousin, even yourself) at no cost
- Use for graduate or professional school (qualified expenses include graduate programs)
- Roll over to a Roth IRA under SECURE 2.0: after 15 years, up to $35,000 in a 529 can be rolled into the beneficiary's Roth IRA, subject to annual Roth contribution limits
The Roth rollover provision significantly reduces the downside risk of overfunding a 529.
Age-Based Investment Options
Most 529 plans offer age-based portfolios that automatically shift from aggressive to conservative as the beneficiary approaches college age. When the child is young, the portfolio holds mostly equities. As college approaches, it shifts toward bonds and stable funds to protect against short-term market downturns.
You can also build your own allocation from the plan's fund menu, though most families use the age-based option for simplicity.
How Much to Save
Rough benchmarks for four-year public in-state tuition (room, board, and fees included):
Current average annual cost: ~$28,000/year = ~$112,000 total
Private four-year college: ~$60,000/year = ~$240,000 total
Costs have historically risen at 3% to 5% per year. Starting early and investing in equity-heavy age-based funds gives the longest compounding runway. Contributing $200 to $400 per month from birth can get a family most of the way to a four-year public university cost by age 18.
Project Your 529 Growth
To model how contributions and investment returns will grow over your target savings period, use the 529 Growth Calculator.