You do not have to file a Missouri return if you are not required to file a federal return.
If you are required to file a federal return, you may not have to file a Missouri return if:
- You are a resident and have less than $1,200 of Missouri adjusted gross income;
- You are a nonresident with less than $600 of Missouri income; OR
- Your Missouri adjusted gross income is less than the amount of your standard deduction plus your exemption amount.
A part-year MO resident is treated as a nonresident but may determine his tax as if a resident for the entire year.
As a part-year resident, you may take either the Missouri resident credit (MO-CR) or the Missouri income percentage (MO-NRI), whichever is to your benefit.
I (not a MO expert) interpret all that to mean that you do not need to file a MO return, if you MO source income is less than $600.
For Kansas filing requirements, see page 3 at:
https://www.ksrevenue.gov/pdf/ip22.pdf
