The amount of the tax credit granted under the provisions of 15-30-2337 through 15-30-2341 is computed as follows:
(1) In the case of a claimant who owns the homestead for which a claim is made, the credit is the amount of property tax billed less the deduction specified in subsection (4).
(2) In the case of a claimant who rents the homestead for which a claim is made, the credit is the amount of rent-equivalent tax paid less the deduction specified in subsection (4).
(3) In the case of a claimant who both owns and rents the homestead for which a claim is made, the credit is:
(a) the amount of property tax billed on the owned portion of the homestead less the deduction specified in subsection (4); plus
(b) the amount of rent-equivalent tax paid on the rented portion of the homestead less the deduction specified in subsection (4).
(4) Property tax billed and rent-equivalent tax paid are reduced according to the following schedule: