Missouri charges 4% flat state income tax plus local taxes in some areas. Use the marriage tax calculator pre-loaded with Missouri rates.
Open Marriage Tax Calculator →Missouri's flat 4% state income tax interacts with federal brackets to create marriage bonuses or penalties that differ from the federal-only effect. Since Missouri uses a flat rate, the state tax does not create its own marriage penalty, but it does amplify the federal effect by adding to the total tax burden. Local income taxes in Missouri add yet another variable to the marriage tax equation. This calculator shows the combined federal and Missouri state marriage tax impact.
Missouri levies a flat 4% state income tax on all taxable income regardless of how much you earn. This makes tax planning straightforward: for every additional dollar you earn, 4 cents goes to Missouri. However, certain localities in Missouri impose their own income taxes, which effectively raise the combined state and local rate above 4%. Be sure to check whether your city or county adds a local income tax.
The table below shows what you actually keep at five salary levels in Missouri, accounting for federal tax, FICA, and Missouri's flat 4% state tax plus estimated local taxes.
See how Missouri compares to other Midwest states. Each link takes you to the marriage tax calculator landing page for that state.
For a comprehensive breakdown of Missouri’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Missouri take-home pay page.