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The RS will not go backwards now and use your 2019 AGI.   They sent out those first checks in a hurry so they used returns from 2018 or 2019.   But the stimulus checks were an advance for a credit you get on your 2020 tax return.   If you got the checks last year and your 2020 AGI is too high, you do not have to pay it back.   But  the 2020 AGI controls whether you get the credit on your 2020 return.   It sounds like your 2020 AGI is much higher than 2019.  

So----your 2020 AGI is what controls it.   You might get a phased out lower amount or nothing.  Sorry but the criteria to get it per the IRS is:

A1. Generally, if you are a U.S. citizen or U.S. resident alien, you will receive an Economic Impact Payment of $1,200  ($2,400  for a joint return) if you (and your spouse if filing a joint return)  are not a dependent of another taxpayer and have a Social Security number valid for employment and your adjusted gross income (AGI) does not exceed:

• $150,000  if married and filing a joint return
• $112,500 if filing as  head of household or
• $75,000  for eligible individuals using any other filing status
  Your payment will be reduced by 5% of  the amount by which your AGI exceeds the applicable threshold above.

You are not eligible for a payment if any of the following apply to you:

• You may be claimed as a dependent on another taxpayer’s return (for example, a child or student who may be claimed on a parent’s return or a dependent parent who may be claimed on an adult child’s return).
• You do not have a Social Security number that is valid for employment.
• You are a nonresident alien.
  The following are also not eligible: a deceased individual or an estate or trust.