@Terry53029 

Where do I have the math wrong?

$3,600  Total credit available (based on assumption of MFJ return, under the AGI limits & no kids)
-3,000  Total EIP amounts received ($2,400 + $600)
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$ 600  Rebate recovery credit available on return

If the software is showing a $1,200 credit available, I'd dig into the math and see which one of the above numbers was different.

Rick