The Stimulus Check is really based on your 2020 return we are filing in 2021. So any amount you already got will be reconciled on your 2020 return line 30. If you didn't get a Stimulus Check (and qualify) or you qualify for more it will be added to your 2020 return. But the good news is if they paid you too much they won't take it back.
When you go through the federal review tab it will ask how much you got if any. Or to enter your stimulus payment in TurboTax, type "stimulus" (without the quotes) in the Search box, then click the link that says "Jump to stimulus."
See this thread, it has good information and a screen shot
https://ttlc.intuit.com/community/after-you-file/discussion/i-filed-an-amended-return-for-2019-to-se...
See these 3 IRS questions on reporting it on your 2020 return
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...
This was published in the Wall Street Journal today and begins to explain the timing and how these 2nd payments are going to occur:
"To avoid sending money during tax-filing season, Congress established a Jan. 15 deadline for making the stimulus payments. Eligible individuals who don’t receive a check or direct deposit by that date will have to request a $600 refund when filing 2020 tax returns. "
That means the IRS is going to have to change how the EIP form that ties to Line 30 works prior to opening up the submission window in late January..... and it's how they are going to ensure that there isn't any unintentional 'double dipping' (I get a stimulus payment and I fail to state that on my 2020 tax return)
The IRS has no Congressional authority to send out payments after January 15, 2021. The law further states this 2nd stimulus (like the 1st one) is an advance of the 2020 tax return - not the 2021 tax return!
Once we get past January 15, 2021, the only way the IRS has to get the 2nd stimulus to taxpayers is through the 2020 tax return, which I suspect means re-tooling the EIP form that ties to Line 30.
and sure enough this is what the tax bill states (page 1969 if anyone really cares)
‘‘(ii) DEADLINE.—
23 ‘‘(I) IN GENERAL.—Except as
24 provided in subclause (II), no refund
25 or credit shall be made or allowed
under this subsection after January
15, 2021.
