529 College Savings Plan State Tax & Growth Calculator
Calculate college funding trajectory, measure annual state tax refund savings, and compare 529 tax-free compounding against a taxable brokerage account.
1. Timeline & Savings Inputs
Contributions2. State Income Tax Deduction
50-State Rules$238,420 (149% of Goal)
$107,000
Your Out-of-Pocket+$131,420
Pure Compound Growth+$26,284
vs Taxable Brokerage$35,000
Max Lifetime RolloverIf your child receives scholarships or attends a cheaper in-state university, you can roll up to $35,000 in unused 529 funds directly into their Roth IRA penalty-free, giving them a 30-year head start on retirement!
College Wealth: 529 Plan vs. Taxable Brokerage
Illustrating annual capital gains and dividend tax drag (15% Fed + state)Click "Run AI 529 Strategy Audit" to evaluate FAFSA financial aid asset treatment (5.64% parent rate vs 20% student rate), age-based target date glide paths, and Grandparent 529 non-reporting loopholes.
Zero Data Access: Your family savings and contribution values execute 100% locally in your browser. Processed on-device
What This Calculator Does
This calculator projects the future value of your 529 college savings plan while measuring the exact state income tax refunds you can earn based on your local residency. It is designed for parents, grandparents, and guardians who want to model the compounding advantage of tax-free growth over standard brokerage accounts.
By inputting your child's age, monthly contribution, and expected college costs, the tool automatically calculates your state tax deduction for the 2026 tax year. It also illustrates how the tax drag in a taxable brokerage account—where dividends and capital gains are taxed annually—reduces your net wealth over time compared to a 100% tax-free 529 plan.
How the Math Works
The mathematical advantage of a 529 plan relies on statutory protections outlined in IRC §529. The calculator models two distinct financial environments over your chosen time horizon.
First, the 529 plan balance compounds monthly without any annual tax drag, ensuring that 100% of the growth remains invested. Second, the taxable brokerage model applies an estimated 1.5% to 2.5% annual tax drag to simulate the taxation of dividends and internal capital gains. The state tax savings are computed using 2026 statutory deduction caps for your selected state. For example, New York allows up to a $10,000 state income tax deduction for married couples filing jointly, producing an immediate state tax refund that effectively subsidizes your contribution.
Worked Example
Consider a married couple in Pennsylvania starting a 529 plan for their 5-year-old child with an initial balance of $15,000 and monthly contributions of $800. They expect a 7.0% annual return and a target college cost of $160,000 by age 18.
- Inputs: Age 5, $15k initial, $800/mo, 7.0% return, PA residency.
- Contributions: Over 13 years, they contribute a total of $124,800 out of pocket.
- Tax-Free Growth: The balance grows to approximately $252,668 by age 18, generating over $112,000 in pure tax-free compounding.
- Tax Drag Saved: Compared to a taxable brokerage account experiencing a 1.6% annual dividend/gains tax drag, the 529 plan saves over $24,000 in lost wealth.
- State Tax Benefit: Pennsylvania's 3.07% flat tax rate yields about $294 in state tax savings every single year.
Frequently Asked Questions
What happens if my child doesn't go to college?
Under the SECURE 2.0 Act (effective 2024 and beyond), up to $35,000 of unused 529 funds can be rolled over tax-free and penalty-free into a Roth IRA for the beneficiary, provided the account has been open for 15 years. You can also transfer the funds to another family member.
Do I have to use my own state's 529 plan?
No, you can invest in any state's 529 plan. However, to claim a state income tax deduction, you typically must use your home state's plan (though a few states, like Pennsylvania and Arizona, offer tax parity for out-of-state plans).
Are 529 plans only for four-year universities?
No. You can use 529 funds for community college, trade schools, vocational programs, apprenticeships, up to $10,000 per year for K-12 private tuition, and a lifetime limit of $10,000 to repay student loans.
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Disclaimer: This tool provides educational and scenario analysis only. It is not intended as tax, legal, or investment advice. You should consult a licensed CPA or financial advisor regarding your specific situation. All figures reflect 2026 statutory limits and may change.
Built and verified by The Core-AI Engineering Desk — last reviewed 2026-08-31. Calibrated strictly to 2026 statutory figures.