Complete both pages. Mailing addresses for Forms 941 ; Department of the Treasury Internal Revenue Service Kansas City, MO 64999-0005.Internal Revenue Service PO Box 806532 Withholding Tax Forms and Instructions To ensure you are able to view and fill out forms, please save forms to your computer and use the latest. Enter negative amounts using a minus sign (if possible). If you have a credit. The 941 form is a federal Internal Revenue Service form. North Carolina Internal Revenue. Form NC-4EZ, or NC-4 NRA, from each new employee when hired. On each payment of wages to an employee, withhold North Carolina income tax in accordance with the.