529 Plan Tax Benefits Calculator 2025
Calculate 529 plan tax-free growth and state tax deduction savings. See how much your 529 grows tax-free versus a taxable account over the years until college.
$
Per year; gift tax limit is $19,000/year Years of contribution + growth
$0
529 Final Balance (Tax-Free)
$0
Taxable Account After-Tax
$0
Total Tax Advantage
$0
State Deduction Saving (Annual)
529 vs Taxable Account Projection
How to Use This 529 Tax Calculator
Enter your annual contribution, years until the funds will be used, and expected annual investment return. Select your state to see if a state income tax deduction is available. The calculator compares a 529 plan (tax-free growth + state deduction) versus a taxable investment account where gains are taxed annually and on withdrawal.
The Formula
529 Balance = Ξ£(Annual Contribution Γ (1 + r)^n) over contribution years
Taxable Balance = Same but growth taxed at federal + state rate each year
Tax Advantage = 529 Balance β Taxable After-Tax Balance
State Deduction Saving = Min(Contribution, State Deduction Limit) Γ State Rate
Total Benefit = Tax Advantage + Cumulative State Deduction Savings
Taxable Balance = Same but growth taxed at federal + state rate each year
Tax Advantage = 529 Balance β Taxable After-Tax Balance
State Deduction Saving = Min(Contribution, State Deduction Limit) Γ State Rate
Total Benefit = Tax Advantage + Cumulative State Deduction Savings
Example
Marcus, New York, $10,000/year, 15 years, 7% return, 22% federal + 6.85% state:
529 balance after 15 years: ~$250,000 (all tax-free)
Taxable account (after-tax growth): ~$215,000
Growth tax advantage: ~$35,000
Annual NY deduction: $5,000 Γ 6.85% = $343/year Γ 15 = $5,145
Total 529 benefit: ~$40,145
529 balance after 15 years: ~$250,000 (all tax-free)
Taxable account (after-tax growth): ~$215,000
Growth tax advantage: ~$35,000
Annual NY deduction: $5,000 Γ 6.85% = $343/year Γ 15 = $5,145
Total 529 benefit: ~$40,145
Extended
State Deduction Comparison
Compare 529 state income tax deductions across major states
State income tax deductions for 529 contributions in major states (2025).
$| State | Single Deduction | MFJ Deduction | State Tax Rate | Annual Saving (Single, $10K contrib) |
|---|---|---|---|---|
| TX, FL, NV, WA, etc. | No state income tax | No deduction (no tax) | ||
| CA, NJ, DE | Income tax exists | No 529 deduction | ||
529 Growth Projection (Year by Year)
| Year | 529 Balance | Taxable Balance | 529 Advantage |
|---|
Frequently Asked Questions
What is a 529 plan and what are its tax benefits?
A 529 plan is a tax-advantaged savings account designed for education expenses. Contributions grow tax-free, and withdrawals for qualified education expenses (tuition, fees, room and board, books, computers) are completely tax-free federally. Many states also offer a deduction or credit on state income taxes for contributions. There is no federal deduction for contributions.
Which states offer a 529 tax deduction?
About 34 states and DC offer a state income tax deduction or credit for 529 contributions. The amounts vary widely: some states (like New York, Illinois) allow deductions up to $10,000 ($20,000 married), while others (like Indiana) offer a tax credit instead. Seven states with income taxes offer no deduction (CA, DE, HI, KY, ME, NJ, NC). Nine states have no income tax at all.
What is the contribution limit for a 529 plan?
There is no annual contribution limit for 529 plans, but contributions are considered gifts for tax purposes. In 2025, you can contribute up to $19,000 per year per beneficiary without gift tax implications (the annual gift tax exclusion). You can also use five-year gift tax averaging (superfunding) to contribute up to $95,000 per beneficiary at once ($190,000 married), treating it as five years of gifts.
What happens to unused 529 funds?
If the beneficiary does not use all funds, you have several options: change the beneficiary to another family member, use up to $10,000 for student loan repayment, roll over up to $35,000 lifetime into a Roth IRA for the beneficiary (starting 2024, subject to conditions), or withdraw the funds and pay income tax plus a 10% penalty on earnings only. Rollovers to Roth IRAs require the 529 to have been open at least 15 years.
Can I use a 529 plan for K-12 education or student loans?
Yes, with limits. Up to $10,000 per year per beneficiary can be withdrawn tax-free for K-12 tuition (public, private or religious school). Up to $10,000 lifetime per beneficiary can be used tax-free for student loan repayment. Qualified apprenticeship programs are also covered. Not all states conform to these federal rules β some states still tax K-12 and loan repayment withdrawals.