In reference to the potentially upcoming new stimulus checks that may be issued...let's assume that I have a client whose 2019 AGI was UNDER the income threshold and accordingly would receive a 2021 stimulus check if the IRS looks at his 2019 tax return as reference to see if he qualifies for a payment.

Let's further assume that the same client's 2020 AGI is OVER the AGI threshold and if I were to e-file his tax return this afternoon, he would not be eligible to receive the next stimulus payment that is likely going to be coming because the IRS would reference his 2020 AGI to see if he qualifies for a payment.

Why would I e-file his 2020 tax return this afternoon and disqualify him from receiving a $2,800 stimulus check?

Am I missing something here?