529 State Tax Deduction Calculator
Find out exactly how much you can save on your state income taxes by contributing to a 529 College Savings Plan. Rules, limits, and benefits vary wildly depending on the state you live in.
Last updated: May 2026
Estimated State Tax Savings
Max Deductible Amount
$10,000
Your state allows a tax deduction up to $10,000 per year for your filing status. The estimated savings uses an average state income tax bracket rate.
Reviewed by Sneha Iyer, CFP
•Certified Financial PlannerSpecializing in wealth management and retirement planning. Sneha validates the investment projection models and compound interest algorithms used across our financial tools. All mathematical models and regulatory data points have been verified for the current 2026 fiscal period.
What is the 529 State Tax Deduction?
While contributions to a 529 plan are not deductible on your federal income taxes, more than 30 US states offer a full or partial tax deduction (or tax credit) for your contributions on your state tax return.
Because each state sets its own rules, the maximum deductible amount depends entirely on where you live and your filing status. For example, New York allows a $10,000 deduction for married couples, while Indiana offers a flat 20% tax credit.
How to use this calculator
- 1Select Your State — Choose the state where you pay state income taxes. Some states require you to use the in-state 529 plan to get the deduction, while others offer 'tax parity'.
- 2Choose Filing Status — Married couples filing jointly often get double the deduction limit of single filers.
- 3Enter Annual Contribution — Input how much you plan to deposit into the 529 plan over the calendar year.
- 4See Your Tax Savings — The calculator applies your state's maximum deduction limits and average tax rates to estimate your actual cash savings at tax time.
Formula & example
Estimated Tax Savings = Min(Contribution, State Limit) × State Income Tax Rate
Example: A married couple in New York contributes $15,000 to a NY 529 plan.
- NY Joint Deduction Limit: $10,000
- Deductible Amount: $10,000 (the remaining $5k is not deductible)
- Assuming ~5.5% NY State Tax Rate.
- Estimated Tax Savings: ~$550
Benefits
Immediate ROI
Getting a state tax deduction provides an immediate guaranteed 'return' on your investment in year one.
Federal Tax-Free Growth
Regardless of state rules, all money in a 529 grows federal tax-free, and withdrawals for education are tax-free.
Roth IRA Rollover
As of 2024, unused 529 funds (up to $35k) can be rolled over to the beneficiary's Roth IRA.
Use cases
Year-End Tax Planning
Making a lump-sum contribution in December specifically to lower your state tax bill before the year closes.
Grandparents Contributing
Grandparents looking to reduce their state taxable estate while funding their grandchildren's education.
Frequently asked questions
Do I have to use my own state's 529 plan?+
Usually, yes. Most states that offer a tax deduction require you to invest in their specific state-sponsored 529 plan. However, about 9 states offer 'tax parity', meaning you get the deduction even if you invest in an out-of-state plan.
What happens if I live in Texas, Florida, or Washington?+
Since these states do not have a state income tax, there are no state tax deductions available. You still get the massive federal tax-free growth benefits, though.
Can I carry forward excess contributions?+
A few states, like Ohio and Virginia, allow you to carry forward excess contributions to deduct in future tax years. Most states, however, have a strict use-it-or-lose-it annual limit.