(c) the amount obtained by dividing, by, as the case may be, the base contribution rate or the first additional contribution rate for employees for the year under the similar plan, the amount by which the amount determined under subparagraph 1 exceeds the amount determined under subparagraph 2:(1) the aggregate of the deductions at source made from the contributor’s salary and wages for the year on account of the base contribution or the first additional contribution, as the case may be, under this Act or a similar plan and any amount an employer has not deducted at source from his salary and wages for the year on account of the base contribution or the first additional contribution, as the case may be, as the employer should have done under this Act or a similar plan, provided that the worker has given notice of that fact to the Minister on or before 30 April of the following year,
(2) the amount by which the aggregate of the deductions at source made from the contributor’s salary and wages for the year under this Act or a similar plan on account of the base contribution or the first additional contribution, as the case may be, exceeds the aggregate of the amounts determined under subparagraphs a and b or c and d of the first paragraph of section 51, as the case may be.