Defense contract renegotiation.

If the renegotiation or price redetermination of any corporation defense contract or subcontract by the government of the United States or any agency thereof or the voluntary adjustment of prices, costs or profits on any such contract or subcontract results in a reduction of income, the amount of any repayment or credit pursuant to such renegotiation, price redetermination or adjustment, including any federal income taxes credited as a part thereof, shall be allowed as a deduction from the corporate taxable income of the year in which said income was reported for taxation. Any federal income tax previously paid upon any income so repaid or credited shall be disallowed as a deduction from income of the year in which such tax was originally deducted, to the extent that such tax constituted an allowable deduction for said year. Any corporate taxpayer affected by such renegotiation, price redetermination or voluntary adjustment may within one year after the final determination thereof file a claim for refund and secure the same without interest, and the department of revenue shall make appropriate adjustments on account of said tax deductions without interest, notwithstanding the limitations of s. 71.75 or other applicable statutes.