Side Income Tax Calculator for Missouri

Side income in Missouri is subject to federal income tax at your marginal rate, self-employment tax if applicable, and up to 4.8% Missouri state income tax. Because side income typically stacks on top of your W-2 salary, it is often taxed at your highest marginal rates. Local income taxes in some Missouri jurisdictions add further cost. The combined marginal rate on side income can easily exceed 40% for mid-to-high earners. This calculator breaks down exactly what you keep from each dollar of side income in Missouri.

Missouri uses a graduated income tax with brackets ranging from 2-4.8%. Lower income is taxed at lower rates, with the 4.8% top rate applying only to income in the highest bracket. This progressive structure means your effective state tax rate is always lower than the top marginal rate. In addition, some Missouri localities impose their own income tax, which stacks on top of the state rate. This is especially notable in areas like certain cities and counties. Always check your local rate when calculating total tax liability.

The table below shows what you actually keep at five salary levels in Missouri, accounting for federal tax, FICA, and Missouri's graduated (2-4.8%) state tax plus estimated local taxes.

See how Missouri compares to other Midwest states. Each link takes you to the side income 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.