In the case of the tax imposed by chapter 2 (relating to tax on self-employment income) and the tax imposed by section
3101 (relating to tax on employees under the Federal Insurance Contributions Act)—
then, if the correction authorized is made, the amount of the assessment, or the amount of the credit or refund, as the case may be, authorized as to the one tax shall be reduced by the amount of the credit or refund, or the amount of the assessment, as the case may be, which would be required with respect to such other tax for the correction of the error if such credit or refund, or such assessment, of such other tax were not prevented by any law or rule of law (other than section
7122, relating to compromises).