@RobertoSh Yes of course an error can cost you a lot of the refund. If you said you did not receive the third stimulus of $1400 per person, but you really did receive it, then the IRS does not give it to you again. They reduce your refund. Did you get the $1400 per person in 2021? Then did you have an amount on line 30 of your Form 1040? You cannot get the $1400 per person twice.
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