Iowa Paycheck Calculator
Free take-home pay estimator for Iowa employees · 2026 tax rates · Updated January 2026
How Iowa paycheck taxes work
Iowa simplified to a flat 3.8% income tax in 2025 — one of the most dramatic tax cuts in the Midwest in recent years.
- Iowa replaced a 9-bracket graduated system (top rate 8.98%) with a flat 3.8% rate in 2025.
- The flat rate is scheduled to decline further in coming years.
- Iowa does not tax Social Security benefits for most filers.
Federal income tax withholding (2026)
Federal income tax withholding is calculated using the annualization method from IRS Publication 15-T. Your per-period gross pay is annualized, reduced by the standard deduction ($15,000 single / $30,000 married / $22,500 head of household in 2026), and then taxed at the applicable bracket rates. The resulting annual tax is divided by your number of pay periods.
2026 federal tax brackets
| Taxable Income (Single) | Rate |
|---|---|
| $0 – $11,925 | 10% |
| $11,926 – $48,475 | 12% |
| $48,476 – $103,350 | 22% |
| $103,351 – $197,300 | 24% |
| $197,301 – $250,525 | 32% |
| $250,526 – $626,350 | 35% |
| Over $626,350 | 37% |
FICA: Social Security & Medicare
FICA taxes are the same in every state. Social Security is withheld at 6.2% on wages up to $176,100 (2026 wage base). Once your wages reach that cap in a calendar year, Social Security withholding stops. Medicare is withheld at 1.45% with no wage cap. An additional 0.9% applies to wages above $200,000 (single) or $250,000 (married).
Iowa state income tax details
Iowa taxes all earned income at a flat 3.80% rate. This applies equally to all wage earners regardless of income level, making the calculation straightforward: multiply your taxable wages by 3.80%.
Pre-tax deductions and your paycheck
Traditional 401(k) contributions and employer-sponsored health insurance premiums (Section 125/cafeteria plan) reduce your federal and state taxable income, lowering your income tax withholding. However, 401(k) contributions do not reduce FICA (Social Security and Medicare) wages. Health insurance premiums under a Section 125 plan do reduce FICA wages. Use the "Show deductions" section above to model your specific situation.
Frequently asked questions
- Iowa has a flat state income tax rate of 3.80%. This rate applies to all taxable income equally, regardless of how much you earn.
- Social Security is a federal tax, not a state tax — the rate is 6.2% for all employees in every state, including Iowa. It applies to wages up to $176,100 in 2026. Once your wages exceed that cap in a calendar year, Social Security withholding stops.
- Start with your gross pay per paycheck. Subtract: (1) federal income tax based on your filing status and 2026 brackets; (2) Social Security at 6.2% up to the wage base; (3) Medicare at 1.45%; (4) Iowa state income tax. Any pre-tax deductions like 401(k) or health insurance reduce your taxable income further. The calculator above does this math instantly.
- Iowa's treatment of Social Security varies. Check the state's Department of Revenue for current exemption rules. At the federal level, up to 85% of Social Security benefits may be taxable depending on your total income.
- Medicare is a federal payroll tax with no state variation. The standard rate is 1.45% for employees in all states including Iowa. An additional 0.9% applies to wages over $200,000 for single filers ($250,000 for married filing jointly) — this is called the Additional Medicare Tax.
Last updated: January 2026 · Data source: IRS Publication 15-T (2026), Iowa Department of Revenue · This tool is for estimation only.