Missouri Bonus Pay Tax Calculator

2026 Missouri bonus withholding

Missouri Bonus Pay Tax Calculator

Estimate a Missouri employee's net bonus with the state's 2026 separate-payment or aggregate rules, Kansas City and St. Louis earnings taxes, federal supplemental-wage methods, FICA thresholds, employer costs, and net-to-gross planning.

Calculate a Missouri paycheck Explore TimeTrex payroll

Bonus inputs

Use gross-to-net for a planned bonus or net-to-gross when a take-home amount was promised.

Gross bonus amount Enter the taxable bonus to be paid.

Supplemental pay type

Federal withholding method

Payment presentation Payment presentation controls federal eligibility and Missouri treatment independently. Missouri requires aggregate treatment whenever the bonus shares a payment with regular wages.

Regular wages had federal income tax withheld

The optional 22% federal flat method generally depends on regular wages having had income tax withheld in the current or prior year.

Pay frequency

YTD Social Security wages from this employer Used only for the 2026 $184,500 Social Security wage-base check.

YTD Medicare wages from this employer Used for the employer's $200,000 Additional Medicare withholding threshold.

YTD supplemental wages before bonus Include supplemental wages paid in 2026 by this employer and businesses under common control for the $1 million federal test.

Regular wages for this pay period Used for aggregate withholding comparisons.

Federal W-4 settings

Federal filing status

Use higher W-4 Step 2 checkbox tables

Annual credits from W-4 Step 3

Annual other income from W-4 Step 4(a)

Annual deductions from W-4 Step 4(b)

Extra federal withholding per regular check

Extra federal withholding on this bonus

Missouri withholding settings

Missouri withholding profile Missouri has no income-tax reciprocity agreements. Nonresident sourcing and Missouri-resident out-of-state work can require forms MO W-4A or MO W-4C.

Missouri income-tax withholding applies

The profile sets this control, but it remains editable for a documented exception. Do not clear it merely because the bonus is separately paid.

Missouri bonus withholding method The flat option is available only for a separate payment when Missouri tax was withheld from regular wages. Otherwise the calculator forces aggregate treatment.

Regular wages had Missouri income tax withheld

This is separate from the federal eligibility checkbox. Clear it when Missouri withholding on the referenced regular wages was zero.

Missouri-taxable bonus percentage Use 100% for a fully Missouri-taxable bonus. A nonresident working inside and outside Missouri should use the Form MO W-4A sourcing fraction.

Regular Missouri-taxable wages for comparison period Used by the aggregate method with the selected payroll frequency.

Form MO W-4 filing status This selects the 2026 annual standard deduction used by the Missouri aggregate formula.

Regular-pay Missouri tax subtraction The official aggregate method subtracts the tax already withheld from regular wages. Actual paystub withholding is most precise.

Actual Missouri tax withheld from regular wages Used only when the preceding selector is set to actual. Missouri withholding is rounded to whole dollars.

Form MO W-4 treatment for this payment Line 3 can replace the standard calculation with a specific amount. Confirm how the employer applies it to a separately paid bonus.

Specific Missouri withholding for this bonus payment Used only with the specific/reduced treatment. If an entered amount exceeds available pay, the standard calculation may apply instead.

Additional Missouri withholding on this payment Optional additional amount requested under Form MO W-4 Line 2; ignored when the specific/reduced treatment is selected.

Kansas City and St. Louis earnings-tax settings

Employee city earnings tax Kansas City means Kansas City, Missouri. St. Louis City is distinct from St. Louis County. Do not stack both cities automatically on the same earnings.

Employee city earnings-tax rate Kansas City and St. Louis City each use 1%. The field remains editable for a documented payroll treatment.

City-taxable bonus percentage Residents generally use 100%. Nonresidents use the share earned from services inside the selected city across the bonus performance period.

Employer cost estimate settings

2026 Missouri UI rate preset Experienced employers should use the assigned DES rate rather than a new-employer preset.

YTD Missouri UI-taxable wages before bonus Used only for the employer-side Missouri unemployment estimate.

Missouri UI wage base The official 2026 taxable wage base is $9,000 per employee.

Missouri UI employer rate The default is the published 2026 ordinary new-employer rate including applicable adjustments.

Missouri UI-covered bonus percentage UI localization can differ from income-tax sourcing. Bonuses are reportable wages in covered Missouri employment.

Include St. Louis employer payroll-expense tax

This 0.5% employer tax applies to compensation attributable to work or services in St. Louis City. It never reduces employee take-home.

St. Louis work allocation for employer tax A St. Louis resident working outside the city can owe the employee tax while the employer payroll-expense allocation remains 0%.

St. Louis employer payroll-expense rate The current city rate is 0.5% of covered gross compensation, including bonuses.

YTD FUTA wages before bonus Used only for the employer-side $7,000 FUTA wage-base estimate.

Estimated net FUTA rate Default assumes the full 5.4% state credit. Final 2026 credit-reduction status is determined after November 10.

Estimated net bonus

Federal flat method with Missouri's 4.7% separate-payment option.

Net bonus $0.00 Tax withholding estimate updates as inputs change.

Gross bonus $0.00

Total withheld $0.00

Effective withholding 0.00%

Employer cost estimate $0.00

Withholding line	Amount

Method comparison

Method	Net bonus	Total withheld

What this calculator includes

Missouri method enforcement

Use the 4.7% separate-payment option only when eligible, or calculate the official 2026 aggregate difference with MO W-4 status and actual regular-pay withholding.

Two city layers

Model the 1% Kansas City or St. Louis employee earnings tax and keep St. Louis's separate 0.5% employer payroll-expense tax outside net pay.

Federal and employer thresholds

Test the federal 22%/37% and aggregate methods, Social Security, Additional Medicare, Missouri UI, and FUTA against separate year-to-date inputs.

This is a 2026 withholding estimate for an ordinary taxable cash bonus paid to a W-2 employee. Pretax deductions, other-state credits, Form MO W-4A or MO W-4C allocations, city return credits, employer withholding practices, prior same-period supplemental pay, wage exclusions, successor-employer rules, common-paymaster rules, special occupations, and payroll-provider rounding can change the paycheck. St. Louis City is not St. Louis County, and Kansas City means Kansas City, Missouri.

Missouri bonus withholding FAQ

Does Missouri tax every bonus at 4.7%?

No. The 4.7% is an optional withholding method for an eligible separate payment, not the employee's final Missouri tax rate.

When is the Missouri aggregate method required?

Use it when the bonus is paid with regular wages or when no Missouri income tax was withheld from the referenced regular wages. It may also be chosen for an eligible separate payment.

How does Missouri aggregate withholding work?

Calculate 2026 Missouri withholding on regular wages plus the Missouri-taxable bonus for one payroll period, then subtract the tax actually withheld from regular wages.

Does Missouri have income-tax reciprocity?

No. Nonresident allocation and Missouri residents working in another state can require state-specific sourcing, credits, and Forms MO W-4A or MO W-4C.

Do Kansas City and St. Louis tax bonuses?

Yes. Each city imposes a 1% earnings tax on applicable employee compensation, expressly including bonuses. Residents and nonresidents can have different allocation rules.

What is the St. Louis employer payroll tax?

It is a separate 0.5% employer expense on compensation attributable to work or services in St. Louis City. It belongs in employer cost, not employee withholding.

Does Missouri unemployment insurance reduce the bonus?

No. Missouri UI is employer-paid. The estimate uses the $9,000 wage base and an editable assigned or new-employer rate.

Can this calculator gross up a promised net bonus?

Yes. Net-to-gross mode solves across federal, Missouri, applicable city, Social Security, Medicare, and Additional Medicare withholding.

Research sources

Rates and formulas are based on primary official material checked on July 20, 2026. Recheck year-specific guides, assigned UI rates, local rules, and federal updates before later-year payroll.

Missouri Department of Revenue2026 Employer's Tax Guide: supplemental wages and MO W-4

Missouri Department of Revenue2026 Withholding Tax Formula

Missouri Department of RevenueWithholding scope and no-reciprocity guidance

Missouri DES2026 unemployment rates and $9,000 wage base

Missouri DESBonuses as reportable UI wages

Kansas City, Missouri1% earnings tax and employer forms

Kansas City, MissouriEarnings and Profits Tax Regulations

City of St. LouisEmployer withholding and payroll-expense tax

City of St. LouisBonus taxability for employee and employer taxes

IRSPublication 15 (Circular E), 2026

IRSPublication 15-T, 2026

IRSAdditional Medicare Tax

IRSFUTA credit-reduction timing

Social Security Administration2026 contribution and benefit base

TimeTrexMissouri payroll tax calculator

Move from a bonus estimate to a complete Missouri paycheck

Need the full paycheck picture? Estimate regular wages, federal withholding, Missouri income tax, applicable city earnings tax, Social Security, and Medicare with TimeTrex's free Missouri Payroll Tax Calculator, or connect approved earnings and payroll records in one workflow.

Calculate a Missouri paycheck Explore TimeTrex payroll

Disclaimer: This calculator provides 2026 payroll estimates for regular taxable cash bonuses paid to W-2 employees based on standard federal withholding rules, Missouri Department of Revenue guidelines (including the optional 4.7% separate-payment rate), and local Kansas City or St. Louis City earnings tax ordinances. Actual paycheck amounts may vary based on Form MO W-4 elections or specific amount entries, non-resident work allocations (Form MO W-4A), FICA wage caps and Additional Medicare thresholds, local employer payroll-expense taxes, or assigned Missouri unemployment insurance rates. These calculations are offered strictly for planning and illustrative purposes and do not constitute formal tax, legal, or accounting advice; employers should verify current state withholding formulas, municipal tax rules, and employee payroll records prior to issuing checks.

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Disclaimer: The content provided on this webpage is for informational purposes only and is not intended to be a substitute for professional advice. While we strive to ensure the accuracy and timeliness of the information presented here, the details may change over time or vary in different jurisdictions. Therefore, we do not guarantee the completeness, reliability, or absolute accuracy of this information. The information on this page should not be used as a basis for making legal, financial, or any other key decisions. We strongly advise consulting with a qualified professional or expert in the relevant field for specific advice, guidance, or services. By using this webpage, you acknowledge that the information is offered “as is” and that we are not liable for any errors, omissions, or inaccuracies in the content, nor for any actions taken based on the information provided. We shall not be held liable for any direct, indirect, incidental, consequential, or punitive damages arising out of your access to, use of, or reliance on any content on this page.

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Missouri Bonus Pay Tax Calculator