Iowa Payroll · Flat 3.8% · IDR Four-Step Formula · IRS Publication 15-T
Iowa Paycheck Calculator 2025
Estimate your Iowa take-home pay for hourly or salaried work in a single form. The calculator deducts federal income tax withholding, Social Security, Medicare, and the Iowa income tax using the Iowa Department of Revenue four-step formula: subtract a marital-status deduction from the IA W-4, apply the flat 3.8 percent rate, then subtract the IA W-4 allowance credit. Uses 2025 IRS Publication 15-T and the 2025 Iowa withholding formula.
Pay Details
Check this on Form W-4 if you hold two jobs or your spouse also works. It switches to the higher Step 2 withholding schedule.
W-4 Adjustments (Optional)
Annual dependent credit total (e.g. $2,000 per child under 17)
Step 4c additional withholding per paycheck
Iowa Tax (IA W-4)
Sets the Iowa deduction: $12,000 single/other, $18,050 head of household, $24,050 married with a non-earning spouse (2025). If both spouses work, use Single / Other.
Each allowance is a $40/year withholding credit on the IA W-4. Leave at 1 if unsure.
Additional Iowa amount requested per paycheck on the IA W-4 (optional).
Enter your pay details and click Calculate to see your take-home pay breakdown.
Want the full Iowa payroll picture, including how the flat 3.8 percent rate reconciles on the IA 1040, the four-step withholding formula, the IA W-4 marital-status deduction, the Iowa-Illinois reciprocal agreement, and the employer unemployment obligations? Read the Iowa Payroll Taxes guide.
Iowa Payroll Taxes Guide →Short Answer
This Iowa paycheck calculator estimates net take-home pay after federal income tax withholding, Social Security (6.2%), Medicare (1.45%), and the Iowa income tax. Iowa withholds a single flat rate of 3.8 percent, applied after a deduction set by the marital status on your IA W-4 and reduced by a $40-per-allowance credit. For a single Iowa worker earning $65,000 per year paid biweekly, gross pay is about $2,500 per period, and net take-home is roughly $2,005 after about $227 of federal withholding, FICA, and about $76 of Iowa income tax. Iowa has no local wage tax and no state disability, family leave, or employee unemployment deduction.
Key Takeaways
- Iowa withholds a flat 3.8 percent income tax on every paycheck. This calculator applies the Iowa Department of Revenue four-step formula: subtract the IA W-4 deduction, multiply by 3.8 percent, subtract the allowance credit, then add any extra requested withholding.
- Iowa's main deduction is a flat annual dollar amount set by the marital status on the IA W-4, not a per-allowance wage exemption: $12,000 single or other, $18,050 head of household, $24,050 married with a non-earning spouse or qualifying surviving spouse (2025).
- A separate IA W-4 allowance credit reduces the tax by $40 per allowance claimed. It is small, so the marital-status deduction and the flat rate drive most of the Iowa line.
- Iowa moved to a single flat rate under Senate File 2442, effective January 1, 2025. The old graduated brackets are gone. The rate stays 3.8 percent for 2026, but the deduction amounts rose (to $13,000 / $19,500 / $26,000).
- Federal income tax uses the IRS Publication 15-T percentage method on annualized wages. Social Security is 6.2% up to the 2025 wage base of $176,100; Medicare is 1.45% with no cap plus a 0.9% surtax that employers withhold on wages above $200,000.
- Iowa has no municipal or county wage income tax, no state disability or family leave deduction, no employee unemployment deduction, and reciprocity with only Illinois. For supplemental pay such as bonuses and RSUs, use the Bonus Tax Calculator and RSU Tax Calculator.
2025 Iowa Payroll Tax Quick Reference
| Tax | Rate | Wage Base / Threshold | Notes |
|---|---|---|---|
| Federal Income Tax | 10%–37% | No cap | Graduated brackets. Based on W-4 filing status and Publication 15-T percentage method tables. |
| Social Security (OASDI) | 6.2% employee | $176,100 (2025) | Withholding stops at wage base. Employer matches 6.2%. |
| Medicare (HI) | 1.45% employee | No limit | Employer matches 1.45%. |
| Additional Medicare Tax | 0.9% | $200,000 single/HOH; $250,000 MFJ; $125,000 MFS | Employee only. Employer withholds once individual wages exceed $200,000 in the calendar year. |
| Iowa Income Tax | 3.8% flat (2025) | All taxable wages | Single flat rate under Senate File 2442, applied after the IA W-4 deduction. |
| IA W-4 deduction | – | $12,000 / $18,050 / $24,050 | Annual deduction by marital status: single/other, head of household, married non-earning spouse. |
| IA W-4 allowance credit | – | $40 per allowance | Subtracted from the Iowa tax as a credit, divided across pay periods. |
| Employee disability / family leave | None | – | No employee deduction. Iowa has no state disability or paid family leave program. |
| Employee unemployment (UI) | None | – | Unemployment is employer-funded; the 2026 taxable wage base is $20,400. |
| Local wage income tax | None | – | No city or county wage tax anywhere in Iowa. |
How This Calculator Works
Hourly Mode: Gross Pay Per Period
Gross pay per period equals the hourly rate multiplied by hours worked per week, then scaled to the pay period. For biweekly pay: hourly rate × hours per week × 2. For weekly: hourly rate × hours per week. For semi-monthly and monthly: hourly rate × hours per week × (52 ÷ periods per year).
Salary Mode: Gross Pay Per Period
Gross pay per period equals annual salary divided by the number of pay periods per year. Weekly: ÷ 52. Biweekly: ÷ 26. Semi-monthly: ÷ 24. Monthly: ÷ 12.
Social Security Tax
Social Security is 6.2% of annualized gross wages up to the $176,100 wage base for 2025. The per-period amount is the annualized Social Security tax divided by pay periods. This calculator does not track year-to-date cumulative wages, so for workers approaching the wage base, actual withholding will stop mid-year once the limit is reached.
Medicare Tax
Standard Medicare is 1.45% on all gross wages. The calculator adds the 0.9% Additional Medicare Tax on annualized wages above $200,000, matching the employer withholding rule in IRS Topic 560: employers withhold the surtax once wages exceed $200,000 in a calendar year regardless of filing status. Your final liability on Form 8959 uses filing-status thresholds ($200,000 single/HOH, $250,000 MFJ, $125,000 MFS), so married filers may reconcile the difference at filing.
Federal Income Tax Withholding
The calculator follows IRS Publication 15-T Worksheet 1A (Percentage Method for Automated Payroll Systems) for 2025:
- Annualize the per-period gross pay (multiply by pay periods per year) - line 1c.
- Add Step 4a other income; subtract Step 4b additional deductions - lines 1d-1f.
- Subtract the line 1g allowance: $12,900 for married filing jointly or $8,600 otherwise. If the W-4 Step 2 box is checked, subtract $0 instead. The result is the Adjusted Annual Wage Amount (line 1i).
- Apply the Annual Percentage Method table for the W-4 filing status - the STANDARD schedule, or the Step 2 Checkbox schedule when the Step 2 box is checked - to get the tentative annual withholding (line 2g), then divide by pay periods (line 2h).
- Subtract Step 3 dependent credits divided by pay periods (line 3c).
- Add Step 4c extra withholding per period (line 4b).
Iowa Income Tax Withholding
Iowa withholds income tax using the four-step formula in the Iowa Department of Revenue's Iowa Withholding Formula. Under Senate File 2442, Iowa applies a single flat rate to wages after a deduction, then subtracts an allowance credit. The steps are:
- Annualize the per-period gross pay (multiply by pay periods per year), then subtract the deduction (D) set by the marital status on the IA W-4. For 2025 the annual deduction is $12,000 for single or other, $18,050 for head of household, and $24,050 for married filing jointly with a spouse who has no earned income (or qualifying surviving spouse). This is step T1.
- Multiply T1 by the flat 3.8 percent rate. This is step T2.
- Subtract the total IA W-4 allowance amount, which is $40 per allowance claimed. This is step T3.
- Divide T3 across pay periods and add any extra Iowa withholding requested on the IA W-4 (step T4). If both spouses of a married couple have earned income, the employer uses the single-column deduction.
| Iowa 2025 withholding input | Single / Other | Head of Household | Married (spouse no income) |
|---|---|---|---|
| Flat tax rate | 3.8% | 3.8% | 3.8% |
| Annual deduction (D) | $12,000 | $18,050 | $24,050 |
| Allowance credit | $40 each | $40 each | $40 each |
These are the 2025 Iowa withholding figures from the Iowa Department of Revenue Iowa Withholding Formula effective January 1, 2025. Iowa also publishes withholding tables that build the same deduction and rate into each pay period; annualizing and dividing produces the same result. Applied to the department's own biweekly example of $2,100 wages with the single deduction and one allowance, the formula yields $1,600 taxable per period, $60.80 of tax, then $59.26 after the allowance credit for the 2026 figures; the same method with the 2025 deduction produces $60.72. Your final Iowa income tax is settled on the IA 1040, where the 3.8 percent flat rate applies. Because withholding is an estimate, small differences are reconciled at filing.
What Iowa Does Not Deduct
Iowa has no state disability insurance, no paid family leave payroll deduction, and no employee unemployment tax. Unemployment insurance is funded entirely by employers through Iowa Workforce Development. There is also no local wage tax anywhere in Iowa, so the only Iowa line on a pay stub is the state income tax.
Real-World Paycheck Scenarios
Scenario 1: Single Worker Paid Biweekly
Ava earns $65,000 per year at a firm in Des Moines. She is paid biweekly, files single on her W-4, uses the single Iowa deduction, and claims one IA W-4 allowance. Her biweekly gross is $65,000 ÷ 26 = $2,500.00.
Iowa income tax detail (annualized): the deduction is $12,000, so taxable wages are $65,000 − $12,000 = $53,000. The tax is $53,000 × 3.8% = $2,014.00, minus the $40 allowance credit = $1,974.00 for the year. Iowa withholding is $1,974.00 ÷ 26 = $75.92 per paycheck. There are no disability, family leave, or unemployment lines, money a worker in California or Washington would see deducted.
Scenario 2: Married Couple, One Earner, Paid Biweekly
Ben earns $95,000 per year in Cedar Rapids, is paid biweekly, files married filing jointly on his federal W-4, and uses the married (spouse no income) IA W-4 status with two allowances. His biweekly gross is $95,000 ÷ 26 = $3,653.85.
Ben's married deduction of $24,050 lowers taxable wages to $95,000 − $24,050 = $70,950. The tax is $70,950 × 3.8% = $2,696.10, minus $80 for two allowances = $2,616.10 for the year, or $100.62 per paycheck. The larger married deduction is worth about $459 a year in Iowa tax compared with the single deduction, so a couple should confirm the correct IA W-4 marital status. If both spouses had earned income, the single-column $12,000 deduction would apply instead.
Practitioner Insight
The Iowa question we field most since the flat tax took effect is why the state line barely moves when someone changes their allowances. The reason is that Iowa's main deduction is a fixed dollar amount tied to the IA W-4 marital status, not the allowance count. The allowances are a separate credit worth only $40 each per year, so adding or dropping one shifts the check by a few cents. What actually moves the Iowa line is the marital-status deduction, $12,000 single versus $24,050 for a married one-earner household in 2025, so that is the field we tell clients to get right.
The second pattern is the married status trap. A married couple where both spouses work should use the single-column deduction on each IA W-4, not the larger married figure, or the combined withholding falls short and they owe at filing. Iowa's formula spells this out: the $24,050 deduction is only for a married couple with a single earner. We see under-withholding most often when a two-income couple both mark the married box.
The third thing we flag for Iowa commuters is the Illinois reciprocal agreement. An Illinois resident working in Iowa files Form IA 44-016 so no Iowa tax is withheld, and pays Illinois instead. That agreement exists only with Illinois; a worker commuting from Minnesota, Wisconsin, Missouri, Nebraska, or South Dakota has full Iowa withholding and files a nonresident Iowa return.
When This Calculator Gives a Less Accurate Estimate
- Pre-tax deductions not entered: A 401(k) or 403(b) contribution and Section 125 medical premiums reduce the wages subject to both federal and Iowa income tax withholding. This calculator does not model pre-tax deductions, so actual income tax withholding is lower and net pay is typically higher than the estimate.
- 2026 deduction change: This calculator is labeled 2025 and uses the 2025 IA W-4 deductions ($12,000 / $18,050 / $24,050). For 2026 the rate stays 3.8 percent but the deductions rose to $13,000 / $19,500 / $26,000, so a 2026 paycheck withholds slightly less. The Iowa Payroll Taxes guide shows the 2026 figures.
- Illinois reciprocity: An Illinois resident working in Iowa who has filed Form IA 44-016 has no Iowa tax withheld. This calculator assumes Iowa withholding applies; set the Iowa tax to zero mentally if you are a covered Illinois commuter.
- Both spouses working: The married (spouse no income) deduction of $24,050 applies only to a single-earner married couple. If both spouses have earned income, choose Single / Other so the $12,000 deduction is used, matching the Iowa formula.
- Year-to-date Social Security cap: The calculator annualizes Social Security evenly. For a worker who passes the $176,100 wage base mid-year, actual Social Security withholding stops at that point rather than spreading across every paycheck.
- Supplemental wages: Bonuses, commissions, and other supplemental pay are withheld at Iowa's flat rate along with regular wages. For the federal supplemental math on a bonus, use the Bonus Tax Calculator.
Frequently Asked Questions
How is take-home pay calculated in Iowa?
Iowa take-home pay equals gross pay minus federal income tax withholding, Social Security (6.2%), Medicare (1.45%), and Iowa income tax withholding. Federal withholding uses IRS Publication 15-T. Iowa income tax is withheld with the Iowa Department of Revenue four-step formula: subtract a deduction set by the marital status on the IA W-4, multiply the result by the flat 3.8 percent rate, then subtract the IA W-4 allowance credit ($40 per allowance) and add any extra requested withholding. Iowa has no local wage income tax and no employee-paid disability, family leave, or unemployment contribution.
What is Iowa's income tax withholding rate for 2025?
For 2025 Iowa withholds a single flat rate of 3.8 percent on taxable wages. Iowa Senate File 2442 replaced the old graduated brackets with this flat rate beginning January 1, 2025. The flat rate applies after a deduction that depends on the marital status reported on the IA W-4 ($12,000 for single or other, $18,050 for head of household, $24,050 for married with a spouse who has no earned income, for 2025), and after subtracting an allowance credit worth $40 per allowance. The rate stays 3.8 percent for 2026.
How does the Iowa IA W-4 deduction work?
Iowa does not use a per-allowance wage exemption for its main deduction. Instead the four-step formula subtracts a flat annual deduction set by the marital status marked on the IA W-4, then applies the 3.8 percent rate, then subtracts a separate allowance credit of $40 per allowance claimed. For 2025 the deduction is $12,000 for single or other, $18,050 for head of household, and $24,050 for married filing jointly with a spouse who has no earned income (or qualifying surviving spouse). If both spouses of a married couple have earned income, the single-column deduction applies.
Does Iowa have a local city income tax?
No. Iowa has no municipal or county wage income tax withheld from employees anywhere in the state, including Des Moines, Cedar Rapids, Davenport, and Iowa City. An Iowa pay stub shows federal taxes and the flat state income tax, with no city or local wage line. This differs from states such as Ohio or Kentucky, where cities or counties layer a local income tax on top of the state tax. (Iowa school districts levy a surtax that is settled on the annual return, not withheld from wages.)
Does Iowa have income tax reciprocity with other states?
Iowa has a reciprocal agreement with only one state, Illinois. Wages earned in Iowa by an Illinois resident are taxable only to Illinois, and wages earned in Illinois by an Iowa resident are taxable only to Iowa. An Illinois resident working in Iowa files Form IA 44-016 with the employer to stop Iowa withholding. Iowa has no reciprocity with any other neighboring state, so a resident of Minnesota, Wisconsin, Missouri, Nebraska, or South Dakota who works in Iowa has Iowa tax withheld and files a nonresident Iowa return.
What is the Social Security wage base for 2025?
The Social Security wage base for 2025 is $176,100. Social Security tax at 6.2% applies to wages up to this amount, and withholding stops once cumulative wages exceed $176,100 for the year. Medicare has no wage base limit and continues at 1.45% on all wages. Employers withhold an additional 0.9% Medicare surtax on wages above $200,000 regardless of filing status; final liability thresholds are $250,000 for married filing jointly and $125,000 for married filing separately.
What To Do Next
If your Iowa paycheck estimate looks off, first confirm you have a current IA W-4 on file with your employer and that the marital status matches what you intended, since Iowa's deduction depends on that status, then check whether pre-tax benefit deductions (401k, health insurance) are lowering your taxable wages. If you are a married couple where both spouses work, use the single-column deduction to avoid under-withholding. If you commute from Illinois, file Form IA 44-016 to stop Iowa withholding. To see how your withholding connects to your year-end return, read the Iowa Payroll Taxes guide and our How Payroll Taxes Work guide.
For hourly workers who also receive overtime, the Hourly Paycheck Calculator lets you model specific hours and frequencies. For a generic multi-state view, use the Paycheck Calculator. To understand every line item on your Iowa pay stub, see our How to Read a Pay Stub guide.
If you have self-employment income in addition to wages, the 1099 Tax Calculator estimates your full federal tax burden including self-employment tax. If you need to estimate quarterly payments on that income, use the Quarterly Tax Calculator. To track a filed state or federal refund, use the Refund Tracker.
Sources & Editorial Disclosure
- Iowa Department of Revenue, Iowa Individual Income Tax Withholding Formula Effective January 1, 2025: the flat 3.8 percent rate (Senate File 2442), the four-step formula, the IA W-4 marital-status deduction amounts ($12,000 / $18,050 / $24,050), and the $40-per-allowance credit reproduced by this engine
- Iowa Department of Revenue, Iowa Individual Income Tax Withholding Formula Effective January 1, 2026: the 2026 deduction increase to $13,000 / $19,500 / $26,000 at the same 3.8 percent rate, and the biweekly worked example ($2,100 wages, single, $40 allowance) yielding $59.26
- Iowa Department of Revenue, Iowa-Illinois Reciprocal Agreement: the Illinois-only reciprocity and Form IA 44-016
- Iowa Workforce Development, Unemployment Insurance Taxes: 2026 taxable wage base $20,400 (Rate Table D), employer-funded, no employee unemployment contribution
- IRS Publication 15-T (2025), Employer's Tax Guide to Federal Income Tax Withholding
- IRS Topic 751, Social Security and Medicare Withholding Rates
- Social Security Administration, 2025 Wage Base ($176,100)
- Authored by Munib Ur Rehman · Reviewed by Nausheen Shahid, LMN Tax Inc. Not affiliated with the IRS or the Iowa Department of Revenue. For informational purposes only.