What is letter 6475, do i need it?

1​The IRS will begin issuing Letter 6475, Your Third Economic Impact Payment, to EIP recipients in late January. This letter will help Economic Impact Payment recipients determine if they are entitled to and should claim the Recovery Rebate Credit on their tax year 2021 tax returns that they file in 2022
.
Letter 6475 only applies to the third round of Economic Impact Payments that was issued starting in March 2021 and continued through December 2021. The third round of Economic Impact Payments, including the "plus-up" payments, were advance payments of the 2021 Recovery Rebate Credit that would be claimed on a 2021 tax return. Plus-up payments were additional payments the IRS sent to people who received a third Economic Impact Payment based on a 2019 tax return or information received from SSA, RRB or VA; or to people who may be eligible for a larger amount based on their 2020 tax return.
​
Most eligible people already received the payments. However, people who are missing stimulus payments should review the information to determine their eligibility and whether they need to claim a Recovery Rebate Credit for tax year 2020 or 2021