If you are mailing your Missouri State income tax payment, you would just need to mail the MO-1040V- Individual Income Tax Payment Voucher along with your check or money order. The other forms are not required. The payment voucher would be included in your printed tax return.
You can also access the voucher here http://dor.mo.gov/forms/MO-1040V_2016.pdf
Make your check or money order payable to the “Missouri Department of Revenue. You would need to write your name, address, SSN, daytime telephone number, and “2016 MO Income Tax” on your check or money order.
Missouri Department of Revenue
P.O. Box 371
Jefferson City, MO 65105-0371
As an alternative, you can also pay online at the Missouri Department of Revenue website http://dor.mo.gov/personal/payonline.php. Scroll down to "Paying Online".