Iowa charges 3.8% flat state income tax. Use the quarterly tax estimator pre-loaded with Iowa rates.
Open Quarterly Tax Estimator →Quarterly estimated payments in Iowa must cover both your federal and state obligations. Iowa applies a flat 3.8% rate, and most states require their own quarterly payment schedule that may differ from the IRS dates. This estimator pre-loads Iowa's tax rates so you can calculate both federal and state quarterly amounts in one place, avoiding underpayment penalties at both levels.
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 quarterly tax estimator 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.