It requires people to save receipts on everything they buy. People (in states that charge sales tax) already sort of are required to do this for goods they buy

It requires people to save receipts on everything they buy. People (in states that charge sales tax) already sort of are required to do this for goods they buy online that don't charge tax. The vast vast vast majority of people (every single person I've asked) evade this tax. I try to pay the tax myself (I'm the only person I know who does this) by going through online receipts, putting them in a spreadsheet and calculating the tax. I know I'm missing some though, I buy too much stuff. There are even people I know who don't just evade the tax out of laziness, but evade it intentionally to save money, intentionally buying stuff online because it doesn't charge tax. My point is that this will be a very large amount of effort for people, and there will be a large amount of tax evasion due to both laziness and greed.