​​​​​Wisconsin Tax Account Number Check Digit Calculation

1. Starting from the furthest most right position, multiply each digit by a weight pattern of 2, 1, 2, 1, 2.
2. If the product is two digits, add the two digits together.
3. Add all digits together.
4. Take the sum and subtract from the next multiple of ten.
5. The result is the check digit.
   
   

   Example:      Wisconsin Tax Account Number 036-1029876543-04

   4 X 2 = 8
   0 X 1 = 0
   3 X 2 = 6
   4 X 1 = 4
   5 X 2 = 10 (1 + 0 = 1)
   6 X 1 = 6
   7 X 2 = 14 (1 + 4 = 5)
   8 X 1 = 8
   9 X 2 = 18 (1 + 8 = 9)
   2 X 1 = 2
   0 X 2 = 0
   1 X 1 = 1
   6 X 2 = 12 (1 + 2 = 3)
   3 X 1 = 3
   0 X 2 = 0
   
   
   1. Since the product of 5 X 2 is two digits, add the two digits : 1 + 0 = 1
   2. 8 + 0 + 6 + 4 + 1 + 6 + 5 + 8 + 9 + 2 + 0 + 1 + 3 + 3 + 0 = 56
   3. 60 - 56 = 4
   4. 4 is the check digit for Wisconsin tax account number 036-1029876543-04.

October 11, ​2023​​