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 the Notice Number located on the notice you wish to pay.Your Notice Number is a unique 13-digit number associated with the current amount you owe. Employers in North Carolina must conform with these state rules relating to filing income tax withholding returns. You can now create and submit business creation documents online here. Need help filing business creation documents online? Each new withholding agent who is required to withhold North Carolina income tax must complete and file with the Department an application for a withholding. Bring the following documents to your Human Resources office.