I request that you send a replacement refund, and if I receive two refunds, I will return one. Write your letter through a MyFTB message.Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax. We're examining your tax return. What you need to do. Use Form 843 to claim a refund or request an abatement of certain taxes, penalties, additions to tax, interest, and fees. If you receive an IRS notice or letter​​ We may send you a notice or letter if: You have a balance due. Your refund has changed. Sending an IRS audit reconsideration request? Information about Form 3911, Taxpayer Statement Regarding Refund, including recent updates, related forms, and instructions on how to file.