If you live in IL and work in MO who's income tax do I pay?

If someone works in another state does that person pay the other state's income tax or the one they live in.

It depends.

To know the accurate answer, you must first consult the state instructions to find out if there is a reciprocity agreement between the state you live in and the state you work in. If so, your income is all considered earned in the home state.

However, with the states you have mentioned there is no reciprocity. This means you will need to file both a Missouri (non-resident) and Illinois (resident) income tax returns. The tax that you pay to Missouri should be considered a credit against your Illinois taxes. (It looks like Line 19 of the IL-1040.)

With some exception, you are paying taxes at your state's rate but writing checks (or having withholding) to two different governments.

You pay taxes in the state you reside in.

both

i do beleive its the one they live in,
I think, cant say for sure
like 90 percent positive " i used to work in il and i live in mo"

Usually they have to pay taxes to both states.

The company you work for takes out taxes for both states. You have to file in both states. Generally you get back most of the money from the state you work in.

Unless one state specifically indicates that you do not have to pay taxes, you will pay taxes in both states. I live in Mo. and work in Kansas. I have to pay taxes in both states.

You complete your federal return first. Then complete the Missouri return second as a Non-Resident. Then you complete your Illinois return and complete a CR form (Credit of Tax Paid to Other States). You do it in that order. If either Kansas City or St. Louis is taking city taxes then you claim that as well on your Illinois CR form. I just went back to your previous answers and every one of them doesn't have a clue what-so-ever. I know. My wife works in Missouri (St. Louis) and we lived in Illinois. I have been doing it this way since 1989.