If any delinquent income or franchise tax has been referred by the department to the attorney general for collection and after having fully investigated the matter the attorney general determines that it would be in the best interest of the state to compromise the tax, a written recommendation shall be made to the department stating the terms upon which the tax should be compromised and the reasons therefor. The department shall approve or disapprove the recommendation and notify the department of justice. If approved the department of justice may enter into a stipulation with the taxpayer providing for the compromise of the tax on the terms set forth in the recommendation and upon compliance by the taxpayer the tax shall be fully discharged. The department of justice shall furnish the department with a copy of such stipulation, and the department or its agents charged with the collection of income or franchise taxes may accept payment of such tax in accordance with the terms of such stipulation and upon payment being made shall credit the unpaid portion of the tax. This subsection shall be in addition to all other powers of the department of justice and the department of revenue with respect to compromise or settlement of income or franchise taxes.