You already got the 3rd Stimulus for 1400 per person? Did it also show up on your tax return 1040 line 30? Line 30 is only if you didn't get the full amount or qualify for more. If the IRS records show they already sent it to you they will remove it from line 30 and reduce your refund or send you a bill. You don't have to do anything.
Right, it is not taxable and you are not paying it back. But you tried to claim it again on line 30. You can't get it twice.
