My father passed away in January. (This is not about estate taxes.) He and I had a joint checking account, which as I understand it, became solely mine when he died and is not part of the estate. The problem is that the IRS is taking monthly payments for his back taxes out of that account. I cannot even figure out who to talk to at the IRS about this. My sister is the executor and has not had any better luck with it. I realize the back taxes still have to be paid, but it should be coming from a different source than my checking account. Any suggestions on how to try to fix this?