@DeanieO I am having the same issue. I amended my 2021 taxes to add a deduction for my son's tuition that I forgot to put. Expecting to get an additional refund, but instead I got a tax bill for $3600. The notice said that my EIC had been reduced from $5960 to $1000 something, but didn't say why. I called the IRS and they told me that this was because when I claimed my 2019 PYEI for 2021, I only claimed my portion ($15,009), when I should have claimed $35,000, which was my then husband and my income combined. Like you, I was married filing jointly in 2019 and HOH in 2021. This came from the IRS agent I spoke to, but I don't know if she is right. The way you explain it, it seems logical that we would only use OUR personal part of the earned income from 2019. But I can't find any place where this is clarified either way. It seems like we would not be the only ones who have this issue, obviously. Did you ever find it written anywhere?
