US 529 Plan Calculator: Tax-Free Education Savings Growth
Estimate what a US 529 plan grows to from a starting balance plus regular monthly contributions — the tax-advantaged college-savings account where investment growth is tax-free when used for qualified education expenses.
Adjust the inputs and select Calculate for a full breakdown.
Year-by-year growth schedule
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Future value | Total contributions | Total interest earned |
|---|---|---|---|
| $5k + $300/mo · 6% · 18yr | $130,889.79 | $69,800.00 | $61,089.79 |
| $0 + $200/mo · 6% · 18yr | $77,470.64 | $43,200.00 | $34,270.64 |
| $10k + $500/mo · 7% · 15yr | $186,970.62 | $100,000.00 | $86,970.62 |
| $2k + $150/mo · 5% · 10yr | $26,586.36 | $20,000.00 | $6,586.36 |
How This Calculator Works
Enter your current 529 balance, monthly contribution, the return you expect, and the years until the money is needed. The calculator compounds the balance monthly and shows the projected value and the tax-free growth. In a 529 plan, investments grow tax-deferred and withdrawals are entirely federal-tax-free when spent on qualified education costs.
The Formula
Future Value with Regular Contributions
P = starting amount, PMT = monthly contribution, r = monthly rate (annual ÷ 12), n = number of months
Worked Example
A $5,000 balance plus $300 a month for 18 years at 6% grows to about $130,890, with roughly $61,090 of that being tax-free growth. A 529 plan (named after the tax-code section) is a state-sponsored, tax-advantaged account for education savings. Contributions are made with after-tax dollars, but earnings grow tax-deferred and come out completely federal-tax-free when used for qualified expenses — tuition, fees, books, and room and board for college, plus up to a yearly limit for K-12 tuition. Many states also offer a state income-tax deduction or credit for contributions.
Key Insight
The 529 plan is the workhorse of US education saving, and its tax treatment is the whole point. The federal benefit: contributions go in after-tax (no federal deduction), but earnings grow tax-deferred and qualified withdrawals are 100% federal-tax-free — a powerful shelter over an 18-year horizon, much like a Roth for education. Many states sweeten it with a state income-tax deduction or credit for contributions (often only if you use your own state's plan), so checking your state's rules can add immediate value. 'Qualified expenses' are broad and have expanded: college tuition, mandatory fees, books, computers, and room and board (if enrolled at least half-time), plus up to a capped annual amount for K-12 tuition, apprenticeship costs, and a lifetime limit for student-loan repayment. The catch this calculator omits: if you withdraw earnings for non-qualified expenses, the earnings portion is taxed as ordinary income plus a 10% penalty (the penalty is waived in cases like scholarships, disability, or death). Flexibility features worth knowing: you can change the beneficiary to another family member, and under recent rules a limited amount of leftover 529 funds can be rolled into the beneficiary's Roth IRA (subject to conditions and caps), easing the 'what if they don't go to college' worry. Estate-planning angle: contributions are completed gifts, and a special election lets you front-load five years' worth of annual gift-tax exclusion at once. Costs matter — plan and fund fees vary widely between states' plans, and you don't have to use your home state's plan (except to get its tax break), so low-cost plans are favoured. This calculator gives a gross, constant-return projection and omits fees; in practice favour a low-cost plan, capture any state deduction, keep withdrawals qualified to preserve the tax-free benefit, and remember markets vary.
Frequently Asked Questions
How is 529 plan growth calculated?
Your balance and monthly contributions compound at the expected return (annual rate ÷ 12 per month). $5,000 plus $300/month for 18 years at 6% grows to about $130,890, with roughly $61,090 of tax-free growth — before plan and fund fees.
What is a 529 plan?
A state-sponsored, tax-advantaged account for education savings, named after the tax-code section. Contributions are after-tax, but earnings grow tax-deferred and qualified withdrawals are completely federal-tax-free. Many states also offer a state income-tax deduction or credit for contributions.
What counts as a qualified expense?
College tuition, mandatory fees, books, computers, and room and board (if at least half-time), plus up to a capped annual amount for K-12 tuition, apprenticeship costs, and a lifetime limit for student-loan repayment. Spending on these keeps the withdrawal federal-tax-free.
What if the money isn't used for education?
Non-qualified withdrawals of earnings are taxed as ordinary income plus a 10% penalty (waived for scholarships, disability, or death). You can also change the beneficiary to another family member, or roll a limited amount of leftover funds into the beneficiary's Roth IRA under recent rules, subject to caps.
Do I have to use my own state's 529 plan?
No — you can invest in almost any state's plan. But to claim a state income-tax deduction or credit you usually must use your own state's plan. Since plan and fund fees vary widely, many savers compare a low-cost out-of-state plan against the value of their home-state tax break.
Related Calculators
Methodology & Review
The future value compounds a starting balance plus a fixed monthly contribution at the annual return, compounded monthly. It assumes a constant return and end-of-month deposits, and does not model plan/fund fees, state contribution limits, or the tax and penalty that apply if funds are used for non-qualified expenses.
Written by Ugo Candido · Last updated May 22, 2026.