$600 was for the second Stimulus check. You have to claim it on your 2020 return, not 2021. Only the 3rd Stimulus goes on your 2021 return. It was for $1400 per person. Did you get that one?
There have been 3 Stimulus Payments so far……
EIP1 The first Stimulus payment was 1,200 for each spouse and 500 for each dependent under 17. Came out in spring of 2020.
EIP2 The second Stimulus was 600 per person and dependents under 17. The 2nd stimulus checks started going out at the very end of December 2020 and continued into January/Feb 2021.
The first 2 Stimulus payments went on your 2020 return even if you got the second one in Jan/Feb 2021.
EIP3 The 3rd Stimulus payment started going out in March 2021 and is for 1,400 for each person listed on your tax return, no age limit. The IRS used your 2020 (or 2019) return to send the checks out fast. If your 2021 return changes and you qualify for more you can claim the extra as the Recovery Rebate Credit on 1040 line 30. But line 30 is only if you didn't get the full amount or qualify for more. Not the amount you already got. The IRS also sent out letter 6475 to tell you how much they sent you . If you are married then each spouse should get a letter for half.
How much is on your 1040 line 30? A common reason this year is if you tried to claim the Recovery Rebate Credit (for the 3rd Stimulus 1,400 per person) when the IRS already sent it to you. Line 30 is only if you didn't get the full amount or qualify for more. Not the amount you already got.
They sent the 3rd Stimulus payment (1400 per person) starting in March 2021. Double check your bank statements and check your IRS account (both accounts if married) to see what they sent you.
https://www.irs.gov/payments/your-online-account
If you didn't get the 3rd Stimulus check but the IRS shows they sent it to you then request a trace for a missing third Stimulus payment
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...
