§ 187-f. Order of credits. Credits allowable under this article which cannot be carried over and which are not refundable shall be deducted first. Credits allowable under this article which can be carried over, and carryovers of such credits, shall be deducted next, and among such credits, those whose carryover is of limited duration shall be deducted before those whose carryover is of unlimited duration. Credits allowable under this article which are refundable shall be deducted last.