Money Missing a stimulus check? IRS Letter 6475 can help you claim Recovery Rebate Credit on taxes. February 1, 2022February 1, 2022 Kelly Tyko and Susan Tompor, USA TODAY Comments Off on Missing a stimulus check? IRS Letter 6475 can help you claim Recovery Rebate Credit on taxes. The IRS is sending letter 6475 ahead of filing their 2021 tax returns. It can help determine if you are owed more money with Recovery Rebate Credit.