(A) An individual taxpayer is allowed a credit from the income tax imposed pursuant to § 12-6-510 for South Carolina state sales or use taxes paid on purchases of tangible personal property used to retrofit the individual’s legal residence pursuant to § 12-6-3660. The credit amount is calculated by multiplying by six percent the purchase price of tangible personal property for which the individual may claim the income tax credit in § 12-6-3660. The maximum credit allowed under this section is one thousand five hundred dollars.

(B) The cost of items that otherwise qualify for the credit that are purchased with grant funds awarded pursuant to § 38-75-485 are not eligible for this credit if the grants are not included in the income of the taxpayer.