Missouri Underpayment Penalities

[cornyb4]

When calculating taxable income through Mar'25, Jun'25 and Sep'25, should I only be including Missouri taxable income, as opposed to KS (Wage) taxable income or other states where I have investment income, but do not pay Missouri income tax on those investments?

[BillM223]

I would presume that the answer is to include only income taxable in Missouri. If you are thinking about Exception 3 on page 3 on the instructions for MO-2210, it refers to "taxable" income.

Note: unless I've missed something, the first quarter ends on April 15th, not March 15th.