Correcting EIP 2021 amount

[Arnold1946]

I did not receive the full EIP amounts for EIP 1 and EIP 2 based on my 2019 income, but since my income in 2020 was lower, I could correct this through my 2020 return, having the remainder included in my refund.

Yesterday, I received the EIP 2021 money (the $1400 one), but also only part of it. This happened during the time between my filing my 2020 return and having that return approved.

How do I claim the remainder of the EIP 2021 money? File an amended return? If so, should I do that right away or wait until my return (as submitted) has been approved? Or is there another (simpler) mechanism?

[Arnold1946]

I realized that there is no entry for EIP 3 on the form to claim the remainder.

So, the question becomes: does anyone know how to reclaim the remainder of the EIP 3 payment?

[Arnold1946]

Never mind. I found the answer at

https://www.businessinsider.com/personal-finance/third-stimulus-check-too-small-what-to-do-2021-3