Iowa Capital Gains Tax Calculator
Iowa taxes capital gains as ordinary income at the state level, which means a gain on selling shares, property or other investments is added to your other income and taxed using the Iowa income tax brackets, with no separate preferential long-term rate like the federal system provides. This calculator estimates the Iowa state tax on a capital gain by stacking the gain on top of your other taxable income and applying the sourced Iowa Department of Revenue brackets for tax year 2025, then taking the difference. Enter your gain, your other annual taxable income and your filing status to see the state tax attributable to the gain and the effective rate on it. The result is the Iowa state portion only; federal capital gains tax, which has separate short-term and long-term rates set by the IRS, is calculated separately. Because the gain stacks on your other income, the same gain is taxed at a higher rate the more you already earn. Some states provide specific exclusions or preferential treatment for certain gains; this tool uses the standard ordinary-income method and links the Iowa Department of Revenue so you can confirm any special rule that applies to you.
Iowa taxes capital gains as ordinary income. A $20,000.00 gain on top of $60,000.00 of other income (single) adds about $780.00 in Iowa state tax, an effective rate on the gain of 3.90%.
How Iowa taxes capital gains
Iowa taxes capital gains as ordinary income, so the gain is added to your other income and taxed at the Iowa bracket rates.
state tax on gain = state income tax on (other income + gain) - state income tax on (other income)
effective rate on gain = state tax on gain / gain x 100
Iowa capital gains tax: frequently asked questions
How are capital gains taxed in Iowa?
Iowa taxes capital gains as ordinary income at the state level: the gain is added to your other taxable income and taxed using the Iowa income tax brackets published by the Iowa Department of Revenue. This calculator applies those brackets to your gain. Some states provide specific exclusions or rates for particular gains; confirm your situation with the Iowa Department of Revenue.
How much state tax will I pay on a $20,000.00 capital gain in Iowa?
Stacked on $60,000.00 of other income, a $20,000.00 gain adds about $780.00 of Iowa state income tax for a single filer, an effective rate on the gain of 3.90%. Your figure depends on your total income and filing status; enter them above.
Does Iowa have a separate long-term capital gains rate?
Most states, including the default treatment here, tax long-term and short-term capital gains at the same ordinary income rates, unlike the federal system which has preferential long-term rates. Any state-specific exclusion or preferential rate is set by the Iowa Department of Revenue; this calculator uses the ordinary income method and links the source.
What is Iowa's income tax rate for 2025?
Iowa imposes a flat income tax rate of 3.9% on all taxable income for tax year 2025. The rate applies to every dollar of taxable income regardless of how much you earn or how you file.
What happened to Iowa's old graduated income tax brackets?
Iowa previously used a graduated system with up to nine brackets and a top rate of 8.98%. Senate File 2342, signed in 2022, set out a multi-year phase-down of those brackets. Each year the rates and thresholds were compressed until, on January 1, 2025, the final transition to a single flat rate of 3.9% was complete.
When did Iowa's flat income tax take effect?
The flat 3.9% rate took effect for tax years beginning on or after January 1, 2025. For tax year 2024, Iowa used a transitional schedule with a reduced number of brackets and lower rates than prior years, but the fully flat structure only applies from 2025 onward.
What standard deduction can Iowa filers claim?
Iowa conforms to the federal standard deduction. For tax year 2025, filers use the same standard deduction amounts set by the IRS: $14,600 for single filers, $29,200 for married filing jointly, $21,900 for head of household, and $14,600 for married filing separately. These amounts are indexed annually for inflation.
Official sources
- Iowa income tax rates applied to capital gains (tax year 2025): Iowa Department of Revenue, as at Jun 12, 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. General information, not financial or tax advice. State-specific exclusions, if any, are set by the Iowa Department of Revenue.