Iowa rewards college savers with a state income tax deduction for contributions to College Savings Iowa (and the advisor-sold IAdvisor 529 Plan), Iowa’s official 529 plans. Unlike many states, Iowa’s cap is per beneficiary, per taxpayer and is indexed for inflation each year. This calculator caps each beneficiary’s deduction, sums across beneficiaries, applies Iowa’s flat income tax rate, and shows the resulting state income tax saving.
How it works
The deduction lowers your Iowa taxable income, so the cash saving equals the deductible amount times your marginal rate:
Deductible per beneficiary = min(contribution per beneficiary, cap) Total deductible = sum across beneficiaries State tax saving = total deductible × marginal rate
For 2025 the per-beneficiary cap is roughly $5,800 and Iowa uses a flat 3.8% income tax. Because the cap is per taxpayer, a married couple who both own accounts can each claim the cap. Any contribution above the cap for a beneficiary is not deductible and cannot be carried forward.
Iowa 529 rules explained
- The deduction applies only to Iowa-sponsored plans (College Savings Iowa, IAdvisor 529) — out-of-state plans do not qualify.
- The cap is per beneficiary and per taxpayer, and is indexed annually for inflation.
- Iowa moved to a flat individual income tax of 3.8% in 2025, so most contributors apply that single rate.
- There is no carryforward of contributions above the cap.
Worked example
A married couple, both account owners, contribute $14,000 to one child’s College Savings Iowa account in 2025 (cap about $5,800 each):
- Spouse A deductible = min($7,000, $5,800) = $5,800
- Spouse B deductible = min($7,000, $5,800) = $5,800
- Total deductible = $11,600
- State tax saving = $11,600 × 3.8% = about $441
Note: This estimates the Iowa state income tax deduction only. It does not model federal tax-free growth, gift-tax limits, or recapture on non-qualified withdrawals. Verify the current indexed cap at tax.iowa.gov or with College Savings Iowa.