If you did not file a return for the 2019 or 2020 tax years, you will be eligible to receive the Third Economic Impact Payment (EIP) in the form of the Recovery Rebate Credit on your 2021 tax return (if you have not received your third stimulus payment). To help claim the Recovery Rebate Credit on your 2021 return, please see our KB article on the subject
The maximum amount for the first stimulus payment credit will be $1,400 for each qualifying person listed on your return.
You can find more information regarding the Recovery Rebate Credit within the 1040 Instructions.