I'd need to see the numbers on something like this. Just saying "Someone said it would work" isn't good enough for me.
In my life I've seen so many cases of that, and then, lo and behold, the reality isn't even remotely accurate. An example being UBI, for which there is literally no way to pay. Or ridiculous assertions of "just tax billionaires!" to pay for it, which won't even cover one year of UBI.
So when someone says "just change to a flat tax", without some raw data I balk.
For example, "compliance costs"?! Just what compliance costs are these? Are you planning to get rid of social security, and medicare taxes on pay cheques too? Fine, but I once pondered that many government jobs are little more than paid welfare.
Just what do you do with all those people that really cannot work well outside of a government, structured, coddled job? My point being, that "compliance costs" are no where near as much of a cost as you might think, as typically every penny paid comes back in income and other taxes, and also gets spent domestically on everything from groceries to car repairs. Those jobs aren't free, but they are not even 1/2 the price they appear to be.
You want to talk about a "compounding effect", that's what government workers are.
But regardless, the feds raised 4T this year, and 42% was income tax, and another 22% for social taxes, eg medicare, social and what not. If you're going to move those taxes from the "pay cheque taxed and income tax cycle" to "consumption tax at the till", then you'll need to replace 65% of existing taxes, which are >4T. Might as well say $3.5T at the federal level alone.
Here:
https://www.statista.com/statistics/249137/us-state-and-loca...
Says total revenue at the state AND county level is $700M.
Here:
https://en.wikipedia.org/wiki/Sales_taxes_in_the_United_Stat...
Shows an interesting graph, with some of the larger economic states, hovering at the top. I'm going to spitball and say 8% average. (The top 10 US states population wise, have more than 50% of the population, and that's why I'm going to poke it at 8%).
So $700M at 8%, is 3.2T at 24%. That's surprisingly close.
You are going to have to watch the black market though. Yes, it already exists.. so what? It will exist more. Especially with shipping stuff in from Canada, you're going to have to have to have "duty" of "federal state tax", otherwise everything will flow, shipped from Mexico and Canada.