(5D)Where the Assessing Officer considers that the return delivered or caused to be delivered under sub-section (5B) is defective, he may intimate the defect to the person collecting tax and give him an opportunity of rectifying the defect within a period of fifteen days from the date of such intimation or within such further period which, on an application made in this behalf, the Assessing Officer may, in his discretion, allow; and if the defect is not rectified within the said period of fifteen days or, as the case may be, the further period so allowed, then, notwithstanding anything contained in any other provision of this Act, such return shall be treated as an invalid return and the provisions of this Act shall apply as if such person had failed to deliver the return.
