About Form W-8, Employer's Tax Return (Mecklenburg County) — IRS Information about Form W-8, Employer's Tax Return (Mecklenburg County). Form W-9 — Online (North Carolina), Mecklenburg County All North Carolina state residents 18 or older are required to submit Form W-9 for any state income tax return that includes either: Any state income tax return. A Form 2106 Income Tax Return or a Form 26-8.9 and 2105, Application For Refund Under the Earned Income Tax Credit; and A state-required withholding tax return. See . Forms and instructions on online filing of W-9 tax return: Federal Tax Law requires that W-9 forms, forms for filing federal tax returns with the Internal Revenue Service (IRS) and Form W-4 for individual income tax returns be submitted to the Mecklenburg County Tax Office. For more information, contact Mecklenburg County Tax Office of Taxes at. Contact Mecklenburg County Tax Office of Taxes to get the Tax Return Online. Mecklenburg County Tax Office of Taxes offers the Tax File Inventories Program (TBI) for those that have difficulty filling out Form W-5, Affidavit of Election for Certain Refunds, on paper. Contact Mecklenburg County Tax Office of Taxes to get the TBI. Form W-8, Employer's Tax Return (Mecklenburg County) — Federal North Carolina residents have the Option of using a Federal Form W-8, Employer's Tax Return. Mecklenburg County residents can print a copy for online filing at . All persons claiming the Child and Dependent Care Tax Credit (CDC) must file a copy of W-7 with Mecklenburg County to claim the credit on the tax return of the dependents of the applicant.