Income tax in the United States increase complexity, irrespective of the system's flatness or lack thereof. Income tax is also levied by most U.S. states and many localities on individuals, corporations, estates, and trusts. These taxes are in addition to federal income tax and are deductible for federal tax purposes. State and local income tax rates vary from 1% to 16% of taxable income. Some state and local income tax rates are flat (single rate) and some are graduated. State and local definitions of what income is taxable vary highly. Some states incorporate the federal definitions by reference. Taxable income is defined separately and differently for
Hall income tax there were bills to raise state government revenue by reducing the fraction of the Hall tax that is distributed to local governments. The proposals for major changes to the Hall tax failed because of the lack of alternative sources of revenue. The Hall tax is Tennessee's only tax on personal income; the state does not levy a general personal income tax. As of 1974, the Tennessee Supreme Court had consistently held that the state constitution authorized only three types of taxes: privilege taxes, "ad valorem" property taxes, and a tax on income from interest and dividends. In decisions in 1932