According to the instructions, the credit in line 51 is calculated like this: MO1040, Line 31 Minus Lines 29 (You/Spouse), 37, and 38. Do you have any entries in those lines?
Publication 111
How do I figure the amount of other states’ taxes to enter in Step 6 for tax years 2009 and after? Follow the Schedule CR Instructions. If you need further guidance, see the “Comparison Formulas for Schedule CR” found on our website for a list of formulas that identify the tax forms, line numbers, additions, and subtractions that you must use to compute the other states’ tax.
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