776.1.5.0.19. If a separate fiscal return in respect of an individual is filed under any of sections 429, 681 and 1003 for a particular period and another fiscal return in respect of the same individual is filed under this Part for a period ending in the calendar year in which the particular period ends, for the purpose of computing the tax payable under this Part by the individual in such fiscal returns, the aggregate of all deductions claimed in those returns under section 776.1.5.0.17 or 776.1.5.0.18 must not exceed the deduction that could be claimed under that section for the year in respect of the individual if no separate fiscal returns were filed under sections 429, 681 and 1003.