Missouri Self-Employed Tax Calculator: What the Show-Me State Takes From Freelance Profit

Missouri is moderate — until the city tax arrives

Missouri sits comfortably in the middle of the state tax league table: a graduated income tax with a 4.7% top rate that works out to roughly 4% on a typical freelance income. Nothing about that is alarming. What makes Missouri freelancers underpay is the same thing that catches freelancers everywhere — the federal SE tax they did not plan for — plus one genuinely local twist: the 1% earnings tax in Kansas City and St. Louis applies to self-employed profit, filed separately, and ignored at your peril.

Run the full stack on $90,000 of profit and the picture is sobering: around $12,700 of federal SE tax, $10,000 of federal income tax, $2,900 to Missouri and $900 to your city if you live in either of the big two. That is roughly 29 cents of every profit dollar, which is why a 20% reserve — the number passed around freelance forums — leaves you short every single year.

This guide walks a complete Missouri example line by line, shows the combined bill at five profit levels, and explains the border question that matters more here than almost anywhere else: which side of the Kansas line you live on changes both your state return and whether a city earnings tax applies.

How to calculate your Missouri self-employed taxes in five steps

1. 01

   Calculate net profit before any tax

   Every layer of Missouri freelance tax starts from net profit — client payments minus deductible business expenses. A freelancer billing $105,000 with $15,000 of software, equipment, insurance and home-office costs has a $90,000 taxable base. Record expenses as they happen; a deduction reconstructed in March is a deduction you will get wrong.

2. 02

   Apply the 15.3% federal self-employment tax

   The SE tax — 12.4% Social Security plus 2.9% Medicare — applies to 92.35% of net profit, up to the Social Security wage cap. On $90,000 of profit it is roughly $12,700, and half of it is deductible against income tax. This is the largest single tax most Missouri freelancers pay, and it arrives with no employer covering half the bill.

3. 03

   Add federal income tax

   After the standard deduction and the half-SE-tax adjustment, a single filer with $90,000 of Missouri freelance profit pays roughly $10,000 of federal income tax, mostly in the 12% bracket with the top portion at 22%. Quarterly estimated payments exist because the IRS charges interest when this money arrives a year late.

4. 04

   Apply Missouri's graduated income tax

   Missouri's top individual rate is 4.7%, with lower brackets below it, so the effective rate on a five-figure freelance income lands around 4%. On our $90,000 example the state takes roughly $2,900 after deductions. Missouri has been trimming the top rate in recent years, so confirm the current schedule each January rather than reusing last year's number.

5. 05

   Check the Kansas City and St. Louis earnings tax

   If you live or work in Kansas City or St. Louis, both cities levy a 1% earnings tax — and yes, it applies to self-employed net profits, not just wages. On $90,000 that is $900, filed separately from your state return. Freelancers who moved to either city from the suburbs are the ones most often caught by this.

A worked example: $90,000 of profit in St. Louis

A single freelance web developer living in St. Louis city with $105,000 of revenue and $15,000 of expenses. The state line is moderate; the federal layers dominate; and the city earnings tax — the line nobody budgeted — adds $900.

Missouri freelance tax at five profit levels

Combined federal SE tax, federal income tax and Missouri state tax at common profit levels for a single filer, before city earnings taxes. Add roughly 1% of profit if you live or work in Kansas City or St. Louis.

Signs your Missouri tax setup needs work

Each of these has a cost — usually discovered in a letter, not a spreadsheet. The city earnings tax is the classic Missouri miss.

• !You live in Kansas City or St. Louis and have never filed the 1% earnings tax
• !Your tax reserve ignores state tax entirely
• !You assume Missouri's top rate is what you pay on every dollar
• !Quarterly payments get skipped whenever a client pays late
• !Your expense records live in an email folder called 'receipts'
• !You moved across the Missouri–Kansas line mid-year and never recalculated
• !Your rate was set from a salary conversion with no tax loading
• !You cannot say what last year's effective state rate actually was

The Kansas City / St. Louis earnings tax, explained properly

Both of Missouri's big cities levy a 1% tax on earnings, and both apply it to the net profits of self-employed people — not just to wages withheld from paychecks. If you live in the city you owe it; if you live outside but perform work inside the city you can owe it too, apportioned by days worked there.

The trap is administrative. Nothing withholds it for you, the state return does not collect it, and national tax software often handles it awkwardly. You register with the city revenue division, file a city return, and pay — separately from everything else. Freelancers who moved from a suburb into the city for an apartment or an office are the ones most often caught two years later.

Price it in from day one. One percent of $90,000 is $900 a year, every year. That is not a rounding error; it is a line in your rate floor, the same as the SE tax and the state tax.

The state-line question Missouri freelancers actually ask

Kansas City sits on a state border, which makes one question unusually common: does living on the Kansas side save money? Broadly, no. Kansas's top rate is higher than Missouri's, and while you escape the 1% city earnings tax by living in Kansas, the state difference typically costs more than the city tax saves. The honest answer is that the border moves money between lines on your return rather than deleting them.

What the border does change is complexity. Live in one state and spend meaningful working days in the other and you may file in both, with credits to prevent double taxation. Keep a simple log of where you worked on which days — a spreadsheet beats a shoebox of guesses when either state's revenue department asks.

Whichever side you land on, the routine is identical: project the year in January, pay quarterly, adjust after each quarter closes, and keep the reserve in an account you do not see every day. State lines complicate the paperwork; they never change the discipline.

Frequently asked questions