(1) A tax measured by net income is hereby imposed on every taxpayer for each taxable year commencing on or after January 1, 1972, and for each taxable year which begins before and ends after January 1, 1972, for the privilege of conducting business, earning or receiving income in this state, or being a resident or citizen of this state. Such tax shall be in addition to all other occupation, excise, privilege, and property taxes imposed by this state or by any political subdivision thereof, including any municipality or other district, jurisdiction, or authority of this state.(2) The tax imposed by this section shall be an amount equal to 51/2 percent of the taxpayer’s net income for the taxable year.(3) The tax imposed by this section, for taxpayers determining taxable income under s. 220.13(2)(k), shall be an amount equal to 3.3 percent of the taxpayer’s net income for the taxable year.(4) In the case of a taxpayer to which s. 55 of the Internal Revenue Code is applied for the taxable year, the amount of tax determined under this section shall be the greater of the tax determined under subsection (2) without the application of s. 55 of the Internal Revenue Code or the tax determined under subsection (3).