Rule 21. Calculation of set on or set off for the sixth accounting year

For the sixth accounting year, set on or set off, as the case may be, shall be made under clause (i) of sub-section (7) of section 26, in the manner illustrated in Schedule A, taking into account the excess or deficiency, if any, as the case may be, of the allocable surplus set on or set off in respect of the fifth and sixth accounting years.