The income-tax laws in force in Guam pursuant to subsection (a) of this section include but are not limited to the following provisions of the Internal Revenue Code of 1986, where not manifestly inapplicable or incompatible with the intent of this section: Subtitle A [26 U.S.C. 1 et seq.] (not including chapter 2 [26 U.S.C. 1401 et seq.] and section 931 [26 U.S.C. 931]); chapters 24 and 25 of subtitle C [26 U.S.C. 3401 et seq. and 3501 et seq.], with reference to the collection of income tax at source on wages; and all provisions of subtitle F [

The Governor or his delegate shall have the same administrative and enforcement powers and remedies with regard to the Guam Territorial income tax as the Secretary of the Treasury, and other United States officials of the executive branch, have with respect to the United States income tax. Needful rules and regulations not inconsistent with the regulations prescribed under section 7654(e) of the Internal Revenue Code of 1986 [26 U.S.C. 7654(e)] for enforcement of the Guam Territorial income tax shall be prescribed by the Governor. The Governor or his delegate shall have authority to issue, from time to time, in whole or in part, the text of the income-tax laws in force in Guam pursuant to subsection (a) of this section.

In applying as the Guam Territorial income tax the income-tax laws in force in Guam pursuant to subsection (a) of this section, the rate of tax under sections 871, 881, 884, 1441, 1442, 1443, 1445, and 1446 of the Internal Revenue Code of 1986 [26 U.S.C. 871, 881, 884, 1441, 1442, 1443, 1445, and 1446] on any item of income from sources within Guam shall be the same as the rate which would apply with respect to such item were Guam treated as part of the United States for purposes of the treaty obligations of the United States. The preceding sentence shall not apply to determine the rate of tax on any item of income received from a Guam payor if, for any taxable year, the taxes of the Guam payor were rebated under Guam law. For purposes of this subsection, the term “Guam payor” means the person from whom the item of income would be deemed to be received for purposes of claiming treaty benefits were Guam treated as part of the United States.

Notwithstanding any provision of section 1424 of this title or any other provision of law to the contrary, the District Court of Guam shall have exclusive original jurisdiction over all judicial proceedings in Guam, both criminal and civil, regardless of the degree of the offense or of the amount involved, with respect to the Guam Territorial income tax.

Suits for the recovery of any Guam Territorial income tax alleged to have been erroneously or illegally assessed or collected, or of any penalty claimed to have been collected without authority, or of any sum alleged to have been excessive or in any manner wrongfully collected, under the income-tax laws in force in Guam, pursuant to subsection (a) of this section, may, regardless of the amount of claim, be maintained against the government of Guam subject to the same statutory requirements as are applicable to suits for the recovery of such amounts maintained against the United States in the United States district courts with respect to the United States income tax. When any judgment against the government of Guam under this paragraph has become final, the Governor shall order the payment of such judgments out of any unencumbered funds in the treasury of Guam.

A civil action for the collection of the Guam Territorial income tax, together with fines, penalties, and forfeitures, or for the recovery of any erroneous refund of such tax, may be brought in the name of and by the government of Guam in the District Court of Guam or in any district court of the United States or in any court having the jurisdiction of a district court of the United States.

The jurisdiction conferred upon the District Court of Guam by this subsection shall not be subject to transfer to any other court by the legislature, notwithstanding section 1424(a) of this title.