@ritadelight - it's unlikely your AGI is the issue - that would have been automatically calculated by TT and then the IRS would have used the same calculation - so there would be no difference.
But let's review your situation. The calcuation for Line 30 of your form 1040 is quite simple:
1) the Number of people listed on your 2021 tax return
2) times $1400
3) less what you received for the Stimulus
4) equals Line 30, but not less than zero
(it's a little more complicated if your AGI exceeds $150,000 but we can come back to that later if necessary, but unlikely to be the issue)
for 3) how much did you receive? DO NOT RESPOND FROM MEMORY...
either look at your bank statements from March - May, 2021
or look at Letter 6475 that the IRS sent to you. What I see over and over on these boards is that couples that filed jointly did not realize that the TWO letters sent to you (one to each spouse) had to be added together to answer TT's question, 'how much stimulus did you already receive'.
The difference between what you actually received (after reviewing your bank statement) and what you originally entered into TT is probably the amount the IRS adjusted.
if that is hard to follow, please post the following and I will explain
1) what is on Line 30 of Form 1040
2) how many people were listed on your 2021 tax return
3) how much did you receive in stimulus last year (again, look at your bank statements - no guessing, please)
4) how much did the IRS adjust your refund / amount you owe by?
