Iowa charges 3.8% flat state income tax. Use the w-4 withholding calculator pre-loaded with Iowa rates.
Open W-4 Withholding Calculator →Getting your W-4 right in Iowa is important because you need to coordinate federal withholding with Iowa's flat 3.8% state withholding. If your W-4 is set too conservatively, you lend the government an interest-free loan; too aggressively, and you face an underpayment penalty. This calculator helps you dial in the right federal withholding amount given your Iowa state tax situation.
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 w-4 withholding 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.