or get rid of the irs and let the states collect taxes like the founders intended.
Suppose one year California, New York, Texas, and Florida decided not to give any money to the Feds. Then the following year (insert superpower here) invaded. What you're describing is the system spelled out in the articles of Confederation. The Continental Army almost starved to death because of that.
Completely disband all Departments and all the the agencies that fall under them except for the Departments of State, Defense, Justice, Treasury, and Interior. Implement a flat tax and reduce the size of the IRS to roughly 5-10% of its current size, and keep them only for the purpose of collectjavascript:void(0);ing the flat tax, nothing else. That would be a good start.
It seems that under your plan veterans would not be looked after (V.A.), states would not get federal money for their schools and have to massively increase property taxes (Dep of Ed), meat packing plants would not be inspected (Dep of Agriculture), the FDA would cease to exist (Dep of Health and Human Services), and the Coast Guard and Border Patrol would cease to exist (Homeland Security.) That's overkill.
Cutting out wasteful spending and programs is a noble thing. Our nation is very complex. The idea that the government can get away without dealing with the economy, consumer safety, and
basic social welfare has been proved wrong by history.
As for the flat tax: I see no reason why those who make more money should not pay more. That said, taxing the rich excessively would cause massive income tax fraud and a loss of revenue. The flat tax would also cause a loss of revenue we can't afford
(as would tax cuts). Remember, there is no right to not be taxed when you are still being represented.