I read through HR25. I see no explicit protection that guarantees that the rate of tax assessed for any given transaction shall be identical for any and all persons who wish to conduct that transaction.
It sets a single rate. and taxes all goods and services no exception. Everyone purchasing for final use or consumption is required to pay the tax with payment for the product. Seller is liable for collecting and remitting the tax to his state tax authority.
Anything in legislation is subject to future change by the body that creates it. It is up to the electorate to assure that legislation stays within acceptable bounds. That is true of the current tax system and any other you can come up with.
The legislation delves into issues of "poverty level" suggesting that some means testing is intended. That smacks of preferential treatment for some class of income earners vs the rest of the population.
Only povertylevel specified by the legislation is that established by HHS, the cost of a defined basket of goods necessary to the maintainance of health updated for inflation, and provides the basis for the amount of FCA to be paid to each household.
There are only two variables, CPI and size of family, and one constant the base value of a definded basket of goods.
Assessing different taxation on the same transaction violates the equal protection clause.
Then asswssing different taxation on the same transaction won't happen will it. The legislation specifically taxes all new goods and services and specifies one tax rate, everyone pays the rate.