2.__Tax imposed.__In addition to all other taxes contained in this Part, a tax in an amount equal to the alternative minimum tax is imposed for each taxable year on the following taxpayers:

A. Resident individuals, trusts and estates;

B. Nonresident individuals, trusts and estates with Maine- source income; and

C. Taxable corporations required to file an income tax return under this Part, excluding financial institutions subject to the tax imposed by chapter 819 and persons not subject to the federal alternative minimum tax under the Code, Section 55(e).

3.__Credit for tax paid to other taxing jurisdiction.__A resident individual, estate or trust is allowed a credit against the tax otherwise due under this section for the amount of alternative minimum tax imposed on that individual, estate or trust for the taxable year by another state of the United States, a political subdivision of any such state, the District of Columbia or any political subdivision of a foreign country that is analogous to a state of the United States with respect to income derived from sources in that taxing jurisdiction also subject to tax under this section.__The credit for any of the specified taxing jurisdictions may not exceed the proportion of the tax otherwise due under this section that the amount of the taxpayer's tentative alternative minimum taxable income derived from sources in that taxing jurisdiction bears to the taxpayer's entire tentative alternative minimum taxable income. When a credit is claimed for alternative minimum taxes paid to both a state and a political subdivision of that state, the total credit allowable for those taxes in the aggregate may not exceed the proportion of the tax otherwise due under this section that the amount of the taxpayer's tentative alternative minimum taxable income derived from sources in the other state bears to the taxpayer's entire tentative alternative minimum taxable income.

4.__Minimum tax credit. A minimum tax credit is allowed as follows.

A.__A minimum tax credit is allowed against the liability arising under this Part for any taxable year other than withholding tax liability.__The minimum tax credit equals the excess, if any, of the adjusted alternative minimum tax,