3060.41—Supporting documentation.
(a)
In support of its calculation of the assumed Federal income tax, the Postal Service shall file detailed schedules reporting the Postal Service theoretical competitive products enterprise assumed taxable income, effective tax rate, and tax due.
(b)
Adjustments made to book income, if any, to arrive at the assumed taxable income for any year shall be submitted to the Commission no later than January 15 of the following year.