The third stimulus payment sent in the March - May 2021 timeframe was $1.400 for each person on the 2020 or 2019 tax return on file with the IRS. If you received the stimulus payment then when asked if you received the payment and it is correct then answer Yes. The 3rd stimulus payment is only reported on the 2021 tax return, not any other stimulus payment that you were eligible to receive in 2020.
