B. The amount of the credit is the portion of the tax paid by the partnership or S corporation under section 43-1014 that is attributable to the partner's or shareholder's share of income taxable in this state.
C. If the allowable credit exceeds the taxes otherwise due under this title on the claimant's income, or if there are no taxes due under this title, the amount of the claim not used to offset taxes under this title may be carried forward for not more than five consecutive taxable years as a credit against subsequent years' income tax liability.