IRS for federal employees - everything else is voluntary.

The Internal Revenue Department taxation is for by "Law" the federal officers and employees. All other so called "taxpayers" are not taxpayers until they agree by way of the Witholding form. When taxes are "voluntary" they mean that it is by contract, contracts contain the laws and the laws are in the contracts. Those laws on the federal lands are also contractual because every person (except those born on federal lands) must perform a conscious act to become a federal citizen which is a citizen of the United States, which is a United States citizen which is a United States person, which is an individual, corporation, business.