District of Columbia Code Division VIII. General Laws. § 47-1808.03. Tax on unincorporated businesses--Levy and rates.

(1) For 1 taxable year beginning after December 31, 1974, a tax at the rate of 12% upon the taxable income of every unincorporated business, whether domestic or foreign;

(2) For the taxable years beginning after December 31, 1975, a tax at the rate of 9% upon the taxable income of every unincorporated business, whether domestic or foreign, except that, effective October 1, 1984, the rate of tax shall be 10% upon the taxable income for any taxable period, except that for taxable years beginning after December 31, 1994, the rate of tax shall be 9.5%;

(3) For the taxable years beginning after December 31, 2002, a tax at the rate of 9.5% upon the taxable income of every unincorporated business, whether domestic or foreign.

(4) For the taxable years beginning after December 31, 2003, a tax at the rate of 9.975% upon the taxable income of every unincorporated business, whether domestic or foreign.

(5) For the taxable year beginning after December 31, 2014, but before January 1, 2016, a tax at the rate of 9.4% upon the taxable income of every unincorporated business, whether domestic or foreign;

(6) For the taxable year beginning after December 31, 2015, but before January 1, 2017, a tax at the rate of 9.2% upon the taxable income of every unincorporated business, whether domestic or foreign;

(7) For the taxable year beginning after December 31, 2016, but before January 1, 2018, a tax at the rate of 9.0% upon the taxable income of every unincorporated business, whether domestic or foreign; and

(8) For taxable years beginning after December 31, 2017, a tax at the rate of 8.25% upon the taxable income of every unincorporated business, whether domestic or foreign.