How much will I take home from a $5,000 bonus in Iowa?

On a $5,000 bonus: federal 22% = $1,100; Social Security 6.2% = $310; Medicare 1.45% = $72.50; Iowa 3.8% = $190.00. That leaves about $3327.50 take-home (before 401(k) or benefits). Use the calculator for your own amount.

Why is so much tax taken out of my bonus?

Bonuses use the IRS flat "supplemental wage" withholding rate of 22% rather than your normal paycheck rate, which can look high if your marginal rate is below 22%. It is only withholding — if too much is withheld, you get it back when you file your annual return.

Is my data sent anywhere when I use this calculator?

No. All calculations run entirely in your browser using JavaScript. No amounts, inputs, or personal data are ever transmitted to any server.

Iowa Bonus Tax Calculator 2025 — 3.8% Supplemental Rate

Work out the tax on a bonus in Iowa — federal 22%, FICA, and a 3.8% state supplemental rate. Instant, in your browser.

Free Iowa bonus tax calculator for 2025. Enter a bonus to see federal supplemental withholding (22%, or 37% above $1,000,000), Social Security and Medicare (FICA), and Iowa state withholding (3.8%) — with your real take-home pay. Runs entirely in your browser; no data sent to any server.

What is the bonus tax rate in Iowa for 2025?

Iowa withholds supplemental wages such as bonuses at a flat 3.8% for 2025. That is on top of the federal flat supplemental rate of 22% (37% on the portion above $1,000,000) and FICA.

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Iowa Bonus Tax Calculator 2025

A bonus is a supplemental wage, and it is taxed differently from a normal paycheck. The federal government withholds a flat 22% on supplemental wages up to $1,000,000 in a year (37% on anything above that), plus FICA. Iowa withholds supplemental wages such as bonuses at a flat 3.8%.

Enter your bonus below. The calculator shows federal supplemental withholding, Social Security (6.2% up to the $176,100 wage base) and Medicare (1.45%, plus 0.9% above $200,000), the Iowa state portion, and your real take-home. Everything runs in your browser — no amounts or personal data are transmitted.

Important: Iowa moved to a flat 3.8% income tax for 2025, which applies to supplemental wages. Verify the current figure with the Iowa Department of Revenue.