Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax. 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. The primary letter we use to request information about a return is Form DTF948 or DTF948O, Request for Information (RFI). Do not use Form 843 to request an abatement of income, estate, or gift tax. I request that you send a replacement refund, and if I receive two refunds, I will return one. You can request a replacement check. Call the Customer Service Center at 609-292-6400 and speak to a Division Representative. You must submit the Employer Certification Letter as it appears in the template. Revenue will reject any requests with changes to the template.