For more on how deductions change taxable wages, see our
pre-tax vs. post-tax deductions guide.
Missouri Paycheck Tax Calculator: How Missouri Withholding Works
A Missouri paycheck calculator has two local lines
to get right: the state income tax and, in two cities, the earnings
tax. On your pay stub the state tax usually appears as
SIT or MO state withholding
and the city tax as KCMO or STL earnings tax. Our
pay stub abbreviations list
explains the other codes.
Federal Withholding for Missouri Paychecks
Federal withholding uses your Form W-4 and the 2026 federal
brackets. The calculator supports filing status, Step 2(c), Step 3
credits and Step 4(a), 4(b) and 4(c). If you claim the new overtime
or tips deductions, our
W-4 Step 4(b) worksheet guide
shows how to enter them, and our
2026 federal tax withholding guide
covers the rest.
Working Across State Lines
Missouri has no reciprocal agreements. Many people cross the state
line around Kansas City: a
Kansas
resident working in Kansas City, Missouri has Missouri tax and the
1% city earnings tax withheld, then claims a credit on the Kansas
return. The same applies to
Illinois
residents working in St. Louis.
Bonuses
Employers can withhold a flat 4.7% on bonuses and other
supplemental pay, or add the bonus to regular wages and run the
formula on the total. Federal withholding (usually a flat 22%),
FICA and any city earnings tax apply too. See
why bonuses are taxed so high.
Employer Payroll Costs in Missouri
Employers pay state unemployment insurance
on the first $9,000 of each employee's wages in 2026. None of it
comes out of your pay. At year-end, our
W-2 form generator
can use the same wage and withholding totals.
Why Your Actual Missouri Paycheck May Differ
This calculator is a close estimate, not your employer's payroll
run. Your MO W-4 on file, whole-dollar rounding, whether your
employer withholds city earnings tax, benefit elections,
year-to-date wages and a 27th biweekly payday in some years can all
move the result a little.
Three-paycheck months
change monthly cash flow but not the tax on each check. For a full
checklist, see why your paycheck is lower than expected.
Official 2026 Missouri Payroll Sources
Payroll facts on this page are checked against the
2026 Missouri Withholding Tax Formula,
the Missouri Department of Labor minimum wage notice,
Missouri unemployment tax rates
and IRS Publication 15-T for 2026.
Reviewed September 25, 2026.