See this Utah state webpage for instructions for completing their mandatory state withholding form.
To claim credit for Utah withholding tax, complete TC-40W, page 1. Enter the following information:
Line 1 – Enter the employer/payer federal EIN (W-2 box “b,” or 1099).
Line 2 – Enter the employer/payer Utah withholding account number (W-2 box 15, or 1099).
For W-2's: The Utah withholding account number is a 14-character number. The first eleven characters are numeric and the last three are “WTH.” Do not enter hyphens. Example: 12345678901WTH.
For 1099's for Mineral Production and Pass-through Withholding: The Utah withholding account number is a 14-character number, 11 numeric and the last three are "WMP".
If form W-2 or 1099 does not include this number, contact the employer or payer to get the correct number to enter on TC-40W, Part 1. Failure to include this number on TC-40W may cause your withholding to be disallowed and delay any refund.
The letters STC are apparently used for Sales and Use Tax. See this TurboTax article for information on claiming sales taxes.
Contact the payer with any questions as to why a particular code was used on their 1099. Failure to include the correct number on TC-40W may cause your Utah state withholding to be disallowed and delay any refund
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