I'm not saying anything about the IRS system, I'm just saying the federal government definitely doesn't have all household sales data for all residential sales. It's not required filing in Missouri and several other states.

The federal government likely has zero clue what I spent to buy my house. They could probably find it if they bothered looking hard enough, but it wasn't directly reported anywhere with the government, especially federally.

I'm totally not against having a simple filing system though and agree for most people for most years it would be way simpler. Just pointing out a spot where you're incorrect on the federal government, especially the IRS, knowing everything. You're getting really angry at me about things I've never said. Probably time to calm down my dude.