If i filed my 2019 tax return on march 30th will the stimulus check be based on those 2019 taxes or will it be based on the 2018?

[JotikaT2]

It depends.

Most likely it will be based upon the most recent tax return available on the date they process your stimulus check.

Please see the link below for the most recent updates from the IRS.

Stimulus payment information from the IRS

[NCperson]

in the end NEITHER!!! 

they will use 2019 if they have it or 2018 if they don't to 'estimate' your ultimate stimulus payment. 

this payment is just an 'estimate' against your 2020 tax return.

Next year, on your 2020 tax return you will re-calculate what was really due to you.

if you were due more (say your 2019 income was too high and you were ineligible but your lower 2020 income made you eligible), that will be a tax credit on your 2020 tax return. 

if you were due less (say your 2020 income was WAY higher than either 2018 or 2019), you won't owe it back. 

Everyone wins.