529 Plan Growth Calculator (Tax-Free + State Deduction)
LiveA 529 plan is the most common tax-advantaged college savings vehicle in the US. Contributions are made with after-tax dollars but grow federal-tax-free, and qualified withdrawals (tuition, fees, room and board, books at eligible institutions) are also federal-tax-free. Most states also allow a state income tax deduction on contributions, up to a state-specific annual cap, providing an immediate tax benefit on top of the long-term tax-free growth.
This calculator takes the initial deposit, ongoing monthly contribution, years until college, expected annual investment return, your state tax rate, and your state's annual deduction cap. It projects the balance at college start, total contributed, investment earnings, and the estimated annual and lifetime state tax savings from the deduction.
A rough sanity check: $5,000 initial plus $400 per month for 18 years at 6.5 percent annual return reaches roughly $173,000 at college start, of which $91,400 is contributions and $81,600 is investment earnings. A New York resident at the 6.85 percent state tax rate with the $5,000 single-filer cap saves about $342 per year in state tax on contributions, totalling $6,160 over 18 years. The combination of tax-free federal growth plus annual state tax savings makes 529 plans particularly attractive for high-tax states.
Most states allow you to invest in any state's 529 plan but only give the state tax deduction for contributions to that state's own plan. Out-of-state plans may offer better investment options or lower fees, in which case the tradeoff between deduction and fund quality is worth evaluating. The most popular plans (NY 529 Direct Plan, Utah my529, Nevada Vanguard) have institutional-quality Vanguard or BlackRock funds at expense ratios near 0.10 percent annually.
Qualified withdrawals are not subject to federal income tax. Non-qualified withdrawals are taxed on the earnings portion at ordinary income rates plus a 10 percent penalty. The penalty is waived for certain exceptions (scholarship offset, disability, military academy attendance, death of the beneficiary). The SECURE Act 2.0 allows up to $35,000 of unused 529 funds to be rolled into a Roth IRA in the beneficiary's name (with conditions), providing flexibility if college costs less than expected.
How 529 plans grow tax-free
When you contribute to a 529 plan, the money is invested in age-based portfolios (which automatically shift from stocks to bonds as the beneficiary approaches college age) or in custom portfolios you select. The investments grow without paying federal income tax on dividends, interest, or capital gains while inside the plan.
When the beneficiary attends an eligible educational institution, withdrawals for qualified expenses (tuition, fees, room and board, books, supplies, special-needs accommodations) come out federal-tax-free. The tax savings on the earnings portion is the primary value proposition: at a 22 percent marginal tax bracket, $50,000 of earnings inside a 529 saves $11,000 in federal tax compared to the same growth in a taxable brokerage account.
State tax treatment varies. Most states with income tax allow a deduction on contributions to that state's plan, with caps ranging from a few thousand dollars to unlimited (PA, IL). A handful of states (CA, HI, KY, ME, NH, NJ) have no state tax deduction even though they have state income tax. Florida, Texas, Washington, Nevada, Tennessee, South Dakota, Wyoming, and Alaska have no state income tax, so no state deduction is relevant.
State tax deduction caps (representative)
New York: $5,000 single / $10,000 married joint, deduction at NY state rate. Virginia: $4,000 per account, deduction at VA state rate, carryforward of excess. Illinois: $10,000 single / $20,000 married joint. Pennsylvania: any amount, no cap, deduction at PA flat 3.07 percent rate; PA also allows contributions to any state's 529 plan to qualify (state-agnostic). Georgia: $4,000 single / $8,000 married joint. Massachusetts: $1,000 single / $2,000 married joint. New Jersey: $10,000 per taxpayer.
The calculator's annualStateCapDollars input lets you enter your specific state's cap. Set to 0 if your state has no deduction.
Age-based vs custom investment options
Most 529 plans offer age-based portfolios that automatically rebalance toward bonds as the beneficiary nears college age. A typical glide path: 80 to 90 percent stocks at age 0 to 8, gradually shifting to 50 to 60 percent stocks at age 13 to 16, and 20 to 30 percent stocks at age 17 to 18. The transition reduces volatility just when you need the money.
Custom portfolios let you pick specific index funds and rebalance manually. This is appropriate for parents comfortable with investment selection who want different equity exposure than the age-based default. Most parents are better off in the age-based option.
Fees matter. The best state plans have expense ratios of 0.10 to 0.20 percent annually on age-based portfolios. Lower-quality plans charge 0.50 to 1.00 percent, which over 18 years compounds to a significant drag on returns. Compare expense ratios on Saving for College's plan rankings before choosing.
Front-loading and superfunding
Front-loading a 529 (contributing a large amount early) maximises compounding time. The most aggressive form is superfunding: making 5 years of gift-tax annual exclusion contributions in a single year. For 2025, the annual gift tax exclusion is $19,000 per recipient; a superfunded contribution can be $95,000 (5 years times $19,000) to one beneficiary, with the gifts spread retroactively over 5 years on a Form 709 election. A married couple can superfund $190,000.
Front-loading is mathematically optimal for compounding but requires available cash. Parents who can afford to superfund at the beneficiary's birth can typically meet the full college funding goal with that single contribution plus modest ongoing contributions.
SECURE Act 2.0 Roth IRA rollover
The SECURE Act 2.0 (enacted December 2022) added an option to roll up to $35,000 of unused 529 funds into a Roth IRA for the beneficiary, starting in 2024. Requirements: the 529 must be at least 15 years old, the rolled-over amount must have been in the account at least 5 years, and the rollover is subject to the annual Roth IRA contribution limit ($7,000 in 2024 and 2025). The provision dramatically reduces the downside of overfunding a 529; excess funds can convert to retirement savings for the beneficiary rather than taking a penalty.
What this calculator does not include
Front-loaded or superfunded contribution scenarios. Specific state-plan investment options and their expense ratios. The Roth IRA rollover option (treats balance as committed to education). Tuition inflation (uses constant dollars; tuition has inflated at roughly 5 percent per year, faster than CPI). Multiple beneficiaries on the same account. Coverdell ESA comparison. Prepaid tuition plans (separate product). Financial aid impact of 529 ownership (parental-owned 529s are assessed at up to 5.64 percent of value in FAFSA; grandparent-owned 529s used to be assessed harder but FAFSA Simplification (2023-24 cycle onward) eliminated this disadvantage). For comprehensive college funding planning, combine this calculator with the college-savings-goal calculator and the college-ROI calculator on this site.
Frequently asked questions
Often yes, but not always. Calculate the lifetime state tax savings from the deduction against the lifetime expense-ratio drag of the home state plan. A 0.30 percent fee difference over 18 years compounds to roughly 5 percent of final balance; a $5,000 annual state tax deduction at 6 percent state rate saves $300 per year, or $5,400 over 18 years. Compare both numbers explicitly before deciding.
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