Go to a flat tax for all citizens and businesses, everyone would have the same percentage. This is a positive motivator for everyone to work. This would result in less paperwork and reduce the size of the IRS.
Change the accounting system of the Federal Government to eliminate the Congress Political Budget crises every year. The problems from not having a budget to work with at the start of the fiscal year results in a lot of wasted time and money for all of Government. Simplify Government accounting process.