Marriage Tax Calculator for Iowa

Iowa's flat 3.8% state income tax interacts with federal brackets to create marriage bonuses or penalties that differ from the federal-only effect. Since Iowa uses a flat rate, the state tax does not create its own marriage penalty, but it does amplify the federal effect by adding to the total tax burden. This calculator shows the combined federal and Iowa state marriage tax impact.

Iowa levies a flat 3.8% state income tax on all taxable income regardless of how much you earn. This makes tax planning straightforward: for every additional dollar you earn, 3.8 cents goes to Iowa. Iowa does not impose local income taxes, so the 3.8% flat rate is the only state-level income tax you owe.

The table below shows what you actually keep at five salary levels in Iowa, accounting for federal tax, FICA, and Iowa's flat 3.8% state tax.

See how Iowa compares to other Midwest states. Each link takes you to the marriage tax calculator landing page for that state.

For a comprehensive breakdown of Iowa’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Iowa take-home pay page.