Flat income tax would still require an IRS.
Actually, so would a NRST, but they wouldn’t be involved directly with any individuals, just retail businesses.
Dissolve/reorganize the IRS, turn over its functions to the Treasury Dept, you should require a lot less personnel to enforce a simplified tax code. Win-win. You have broken up a corrupt entity and you have saved the tax money because you should need significantly fewer people to collect revenue.
We should also do the same to DHS...giving most of its law enforcement/investigative functions to the FBI and some to the Dept of the Interior.
Oh, and goodbye BATFE. Their one true legitimate activity, the “E” part could also be transferred to the FBI. The other 3 functions the “A, T, F” are all red-blooded American activities and should scarcely be regulated anyway.
I am joking a bit about the “A&T”, but the “F” is a Constitutional/Natural right and should not be infringed. :-D