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 legal name, Account ID, and Federal Employer.Identification Number (FEIN) or Social Security Number (SSN). Write bill number on check or money order. Mecklenburg County Tax Collector P.O. Box 71063. In order to receive the automatic state extension, you MUST fill in the "Federal Extension" circle on page 1 of Form D-400. Basics of Business Personal Property Taxes. Learn more about the Business Personal Property Tax and who is required to file it. Fill out an "Application for Benefits" from the forms section on this page and return it to your local department of social services. Please note the following:.