So I had a client in today, she make quite a bit more money in 2018 and 2019 than 2020. 

So her first EIP was only $401 (based on 2018)

The second one she got zero, due to her 2019 income exceeding the limit.

But in 2020 her income qualified her for the full amount of $1800. so she got the $1399 on her tax return.

If Id just marked a box somewhere, would it have given her this correct amount?