Get rid of income taxes entirely and move to consumption-based taxation, excise taxes, a flat carbon tax, and user fees. Cut defense significantly, scotch Obamacare, and means test Medicare. Change the SS cost-of-living increases to a more accurate/less generous pegging. Cut all corporate subsidies and eliminate the most ludicrous discretionary elements in the budget, and go on a nationwide waste and inefficiency elimination hunt at all level of government. It can absolutely be done, even with revenue neutral or lowered.