I filed my 2021 federal returns, and reported that I received $2,000 in Economic Impact. However, I just learned via my Letter 6475 from the IRS, that I only received $1,400 in 2021, and that the extra $600 was part of the 2020 stimulus. Because I was able to file Head of Household, they still owe me $1,400 for 2021, not the $800 I thought. How do I file an amendment to get back the additional $600 I paid. I don't see in option for this in the Turbo Tax amend return online portal. I don't even see a section for it on the IRS 1040-X paper form. I don't believe they'll just decide to send it back to me without me asking... Thanks!