Sec. 8. (a) Subject to section 14 of this chapter, and except as provided in section 15.5 of this chapter, a taxpayer is entitled to a credit against the taxpayer's state tax liability in the taxable year in which the taxpayer completes the preservation or rehabilitation of historic property and obtains the certifications required under section 9 of this chapter.
(b) The amount of the credit is equal to the lesser of ten thousand dollars ($10,000) or twenty percent (20%) of the qualified expenditures that:
(1) the taxpayer makes for the preservation or rehabilitation of historic property; and
(2) are approved by the office.
(c) In the case of a husband and wife who:
(1) own and rehabilitate a historic property jointly; and
(2) file separate tax returns;
the husband and wife may take the credit in equal shares or one (1) spouse may take the whole credit.