Our Republic was established without an income tax. At least, one like we see today. If you return the federal government back to the size and scope it was intended, and is limited to by the Constitution, then there is no need for any income tax. Tariffs and interstate commerce will fund it without any problems. Eliminate all welfare, Social Security, Medicare/Medicaid, all agencies and programs not specifically authorized by the Constitution, Eliminate the Federal Reserve, eliminate fiat currency and return to gold and silver coins. Reduce the military to a much smaller force, and repeal all laws infringing on weapons ownership, weapons carry, and laws infringing on forming local militia's.

That is a good start.