(a) Each taxpayer, as defined in § 12-242aa, shall pay, annually, a tax for the privilege of carrying on any unrelated trade or business within this state, with such tax to be measured by the unrelated business taxable income of such taxpayer apportioned to Connecticut in accordance with subsection (b) of this section for any taxable year commencing on or after January 1, 1992, and to be imposed on such unrelated business taxable income for each such taxable year in the same manner and at the same rate as the tax imposed under § 12-214. The provisions of sections 12-222, 12-225 to 12-229, inclusive, 12-231, 12-232 to 12-237, inclusive, 12-242 and 12-242c to 12-242i, inclusive, shall apply to the provisions of § 12-242aa, and this section in the same manner and with the same force and effect as if the language of said sections 12-222, 12-225 to 12-229, inclusive, 12-231, 12-232 to 12-237, inclusive, 12-242 and 12-242c to 12-242i, inclusive, had been incorporated in full into and had expressly referred to the tax imposed under said § 12-242aa and this section, except to the extent that any such provision is inconsistent with a provision of § 12-242aa and this section.

(b) The portion of the unrelated business taxable income of a taxpayer to be apportioned within this state shall be determined by multiplying its unrelated business taxable income by an apportionment percentage to be determined by: (1) Ascertaining the percentage which the average value of taxpayer’s real and tangible personal property in its unrelated trade or business within the state during the period covered by the taxpayer’s return bears to the average value of all the taxpayer’s real and tangible personal property wherever situated during such period which is used in its unrelated trade or business; (2) ascertaining the percentage which the receipts of the taxpayer’s unrelated trade or business, computed on the cash or accrual basis according to the method of accounting used in the computation of the taxpayer’s unrelated business taxable income, arising during such period from (A) sales of tangible personal property by the unrelated trade or business where shipments are made to points within this state, (B) services performed within the state by the unrelated trade or business, (C) rentals from property of the unrelated trade or business situated within the state, and (D) all other receipts earned by the unrelated trade or business within the state, bear to the total amount of the receipts of the unrelated trade or business, similarly computed, arising during such period from all sales of its tangible personal property, services, rentals and all other transactions, whether within or without the state; (3) ascertaining the percentage of the total wages, salaries and other personal service compensation, similarly computed, during such period of employees of the taxpayer’s unrelated trade or business within the state, except general executive officers, to the total wages, salaries and other personal service compensation, similarly computed, during such period of all employees of the unrelated trade or business within and without the state, except general executive officers; and (4) adding together the percentages so determined and dividing the result by the number of percentages, provided if the taxpayer does not have a regular place of business outside the state in which its unrelated trade or business is conducted, the business apportionment percentage shall be one hundred per cent.

(c) If it shall appear to the commissioner that the apportionment percentage determined in this section does not properly reflect the activity, business or income of a taxpayer’s unrelated trade or business within the state, the commissioner shall be authorized, in his discretion, to adjust it by (1) excluding one or more of the factors therein, (2) including one or more other factors, such as expenses, purchases, contract values, (3) excluding one or more assets in computing such allocation percentage, provided the income therefrom is also excluded in determining unrelated business taxable income or (4) any other similar or different method calculated to effect a fair and proper allocation of the income reasonably attributable to this state.

(d) For purposes of this section, the term “tangible personal property” means corporeal personal property, such as machinery, tools, implements, goods, wares and merchandise, and does not mean money, deposits in banks, shares of stock, bonds, notes, credits or evidences of an interest in property and evidences of debt.

(e) Each taxpayer shall file a tax return with the commissioner, in such form and containing such information as he may prescribe, which return shall be due on the same day such taxpayer’s return for federal tax on unrelated business income shall be due without regard to extensions to file. The tax imposed by this section shall be due and payable to the commissioner on or before the date prescribed herein for the filing of the return.