529 State Tax Deduction Real Value Calculator
Example: Annual 529 contribution: 6000 $ · State 529 deduction limit per year (single filer): 5000 $ · State income tax rate: 5 % · Years until college: 15 · Expected annual investment return: 7 %
| Total compounded value of state deduction | $6,722 |
| State tax saved this year | $250 |
| Compounded value of annual tax savings reinvested | $6,722 |
| Effective cost of this year's contribution after deduction | $5,750 |
Worked example
Contributing $6,000/year to a 529 with a $5,000 state deduction limit at a 5% state rate saves $250 in year 1 ($5,000 × 5%). Reinvested at 7% for 15 years, that $250 becomes about $690. Do the same every year for 15 years and the compounded total of all reinvested tax savings reaches approximately $6,600 — real money from a deduction that looks like 'only $250 a year' on the state return.
Frequently asked questions
Which states offer the best 529 deductions?
States with no dollar cap on 529 deductions (like New York for in-state plans, up to $5,000/$10,000 MFJ) or high deduction limits relative to state income tax rates offer the most value. Several states — including California, Delaware, Hawaii, and Massachusetts — offer no state deduction at all, making 529s purely a federal/investment play for residents there.
Can I deduct contributions to another state's 529?
Most states require contributions to their own plan to qualify for the deduction. A handful of states (including Arizona, Arkansas, Kansas, Minnesota, Missouri, Montana, and Pennsylvania) offer deductions for contributions to any state's plan. Check your state's rules before choosing a plan solely on investment lineup.
What if my child does not go to college?
529 funds can be rolled over to a Roth IRA for the beneficiary (up to $35,000 lifetime, subject to annual IRA limits, per SECURE 2.0 rules effective 2024). They can also be transferred to another family member. Non-qualified withdrawals face income tax + 10% penalty only on the earnings portion, not your contributions.