Note: You must complete a separate Form 3911 for each refund for which you are requesting information. Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax.To request a tax refund, file an Application for Refund - Sales and Use Tax (Form DR-26S) or Application for Refund - All Other Taxes (Form DR-26). Check the box below that indicates your reason for filing Form 843. Tax. Abatement or refund of tax other than income, estate, or gift tax. Mail or fax the completed IRS Form 4506-T to the address (or. FAX number) provided on Page 2 of the form. On this page are descriptions of the various forms that landlords might encounter when participating in the HCV program. Complete an online application for admission. Authorization to Hold a Credit Balance.