Sales tax is an evil form of taxation. The poorer you are, the more you pay because you can't avoid consuming if you're poor. Rich people have a choice to spend, and on what.

The consequence is that very soon, if not from start, there will be huge pressure to have different rates for different item categories, exemptions, etc. further complicating compliance.

And this is one of those taxes that people do not pay directly, and companies have to collect on behalf of the State. Which is absolutely evil in the type of mindset that it creates (similar to the effects of AML/KYC on banking).

Tariffs have a similar effect on consumers, but at least they don't overburden companies and individuals with extra administrative costs and keep the responsibility and liability to collect on the State.

Don't get me wrong, ending the income tax is a net positive, regardless because it's the number 1 Evil tax (tied with the corporate tax and capital gains tax -- they're a triplet taxing the same thing: productive work), so I welcome it.

But doing it this way makes it a lot less than it could be.