Is this Utah by any chance? If so, the Utah employer's state withholding ID has to be 14 characters consisting of 11 digits plus the 3 letters wth in lower case and no hyphens. Example 12345678901wth
Again, be sure to use lower case for the wth.
It has to be that way on all W-2's and 1099's that have Utah withholding. For mineral payments with Utah withholding the last 3 letters should be wmp.
