There are legit reasons for federal government to exist. Beyond that cutting off their funding, and their ability to borrow without supermajority state approval, along with Paul Mac Penny plan implementation will go a long way to fixing our problems. So I will defer to you and recommend a maximum federal sales rate of 7%. Please feel free to cut that rate if you like. : D
I think that leaves wiggle room for corruption to begin again. Feds ability to raise any funds must be stopped completely. Make them our servants again.