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.
Are you on track? Projected savings vs projected college cost
The hardest question a 529 owner asks isn't 'how much will my savings grow to' — it's 'will it be enough?'. The projected 4-year cost table below shows that figure for the three most common college types, at 5% tuition inflation (close to the long-run College Board average).
Walked example: a parent saving $300/month for 18 years at 6% reaches about $130,890 (the calculator output above). The projected 4-year cost of an in-state public college in 18 years is about $299,152 — so the $130,890 covers roughly 44% of the bill. For out-of-state public ($484,722) or private ($626,726), the same savings cover 27% and 21% respectively.
There are three levers to close the gap: contribute more (raising $300 to $700/month brings the in-state cost into reach), start earlier (every extra year is roughly an extra ~6% in real terms), and aim for the right cost tier (in-state public colleges remain dramatically cheaper than private).
State tax deduction: a big and variable second benefit
On top of federal tax-free growth and tax-free qualified withdrawals, more than 30 US states offer a state income tax deduction or credit for 529 contributions. The size varies dramatically: New York deducts up to $5,000/$10,000 (single/joint) of contributions per year; Illinois deducts up to $10,000/$20,000; Pennsylvania deducts contributions to any state's 529; California gives no deduction at all.
Most states limit the deduction to contributions made to the state's own plan — Pennsylvania, Arizona, Kansas, Minnesota, Missouri, Montana, and Ohio are notable exceptions that allow deductions for any state's plan (sometimes called 'tax parity' states).
When choosing between an in-state plan and a cheaper out-of-state plan, the comparison is: 'state tax saving on contributions' vs 'lower fund fees over the investment horizon'. For high-cost in-state plans with generous deductions, the deduction usually wins for the first few years of contributions and the cheaper plan wins over longer horizons; for low-cost in-state plans (Utah, New York, Nevada, Illinois — all under 0.20% all-in), the in-state plan typically wins on both counts.
Roth IRA rollover (SECURE 2.0): the new escape hatch for leftover 529s
Starting in 2024, the SECURE 2.0 Act lets owners roll over unused 529 funds into the beneficiary's Roth IRA, removing one of the historical worries — 'what if my child doesn't go to college?'.
Rules to know: the 529 must have been open at least 15 years; rollovers are capped at $35,000 over the beneficiary's lifetime; annual Roth contribution limits apply (so $7,000/year currently means it takes at least 5 years to move the full $35,000); the beneficiary must have earned income equal to the rollover amount; and contributions/earnings made in the last 5 years can't be rolled over.
Several states have not yet conformed to this federal treatment, so the rollover may still be subject to state income tax and recapture of prior state deductions until they update. Check your state's response before relying on this strategy.
Age-based portfolios and the glide path
Most 529 plans offer an 'age-based' or 'enrollment-year' portfolio that starts heavily in equities when the beneficiary is young and gradually shifts to bonds and cash as college approaches. This is the default choice for most savers and serves the dual purposes of maximising growth early and protecting the balance in the last few years before withdrawal.
A typical glide path: 90% equities at birth, falling to about 50% by age 10, 25% by age 15, and 5–10% by age 18. The exact path varies by plan — some plans offer 'conservative', 'moderate', and 'aggressive' glide paths for the same age, and some let you build your own static allocation.
The risk this manages is sequence-of-returns: a 30% market drop is recoverable when the child is 5 but devastating when they're 17 and tuition is due in months. The age-based path is the simple, robust default; only override it if you have a specific reason.
Qualified expenses & the penalty for non-qualified withdrawals
Federal-tax-free withdrawals cover: tuition, mandatory fees, books and required supplies, computers and software, room and board (if enrolled at least half-time), up to $10,000/year of K-12 tuition (federal — some states have not conformed), apprenticeship costs, and a $10,000 lifetime cap on student-loan principal/interest repayment.
Non-qualified withdrawals owe ordinary income tax PLUS a 10% federal penalty on the earnings portion only (contributions come out tax- and penalty-free anyway, because they went in after-tax). The 10% penalty is waived if the beneficiary receives a scholarship (up to the scholarship amount), attends a US military academy, becomes disabled, or dies.
Three common pivots that avoid the penalty entirely: change the beneficiary to another family member (broadly defined — siblings, cousins, parents, the owner themselves); use the Roth IRA rollover (above); or hold the balance for the beneficiary's future graduate school or for a grandchild.
Projected 4-year college cost (5% tuition inflation)
Current full 4-year costs (2024–25, College Board Trends in College Pricing): in-state public $28,840/yr, out-of-state public $46,730/yr, private nonprofit $60,420/yr. Projected forward at 5% tuition inflation per year. The figure shown is the TOTAL 4-year cost paid out during the four enrollment years.
| Years until college | In-state public 4-yr | Out-of-state public 4-yr | Private nonprofit 4-yr |
|---|---|---|---|
| 10 years | $202,478 | $328,079 | $424,193 |
| 15 years | $258,419 | $418,721 | $541,390 |
| 18 years (newborn today) | $299,152 | $484,722 | $626,726 |
| 22 years (newborn + grad school) | $363,622 | $589,183 | $761,790 |
Tuition inflation has historically exceeded general CPI. The 5% assumption is consistent with the long-run College Board average; recent years have ranged 2–6% depending on sector. These are sticker prices before scholarships and need-based aid; net cost for many families is materially lower.
529 plan vs other ways to save for education
The 529's federal tax-free growth + tax-free qualified withdrawals make it the default for most college-saving families. But it isn't the only option — and for some situations another vehicle fits better.
| Aspect | 529 Plan | Coverdell ESA | Roth IRA (parent's) | Taxable brokerage / UGMA |
|---|---|---|---|---|
| Annual contribution limit | High aggregate (>$300k by state); 5-yr gift election available | $2,000 per beneficiary per year | $7,000/year ($8,000 if 50+) Roth limit | Unlimited |
| Tax on growth | Tax-free if qualified | Tax-free if qualified | Tax-deferred; tax-free after 59½ | Annual tax on dividends + cap gains on sale |
| Use restrictions | Education (K-12 capped) or Roth rollover | K-12 + higher ed | Originally retirement; up to $10k of earnings penalty-free for first home | None |
| State tax deduction | Yes in most states (varies) | No federal/state deduction | No | No |
| Impact on financial aid (FAFSA) | Parent asset — minimal hit (~5.64%) | Parent asset — minimal hit | Retirement asset — not counted; withdrawals count as income | Custodial: child asset — 20% hit; parent: ~5.64% |
| Best when | You're confident the child is college-bound | Funding K-12 private tuition and college | Hedging — money you might need for retirement instead | Flexibility matters more than tax savings |
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.
References & Authoritative Sources
- IRS — Publication 970 — Tax Benefits for Education · consulted May 31, 2026 · Federal definitions of qualified expenses, contribution rules, gift-tax 5-year election, non-qualified withdrawal penalty
- SEC — Securities and Exchange Commission — Investor Bulletin: An Introduction to 529 Plans · consulted May 31, 2026 · Federal investor-protection authority's overview of 529 plan types and fees
- College Board — Trends in College Pricing and Student Aid 2024 · consulted May 31, 2026 · Source of the current average 4-year cost figures and historical tuition inflation
- Congress.gov — SECURE 2.0 Act of 2022 — Section 126 (529 to Roth IRA rollover) · consulted May 31, 2026 · Statutory basis for the $35,000 lifetime 529-to-Roth-IRA rollover provision effective 2024
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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.
Reviewed according to the CalcDomain Editorial Policy & Calculator Methodology. We document formulas, edge cases, sources, update dates, and correction paths for calculator pages.
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