The value of a supply relating to any payment in respect of which any discrepancy is communicated and which is not rectified by the supplier in his valid return for the month in which discrepancy is communicated, the same will be added to the output liability of the said supplier in the subsequent month succeeding in which the discrepancy is communicated. The concerned supplier will, in whose output tax liability any amount has been added, be liable to pay the tax payable in respect of such supply along with interest on the amount so added from the date such tax was due till the date of its payment.
(ICAI FAQ PUBLICATIONS 06-09-2017 TAX PAYMENTS, INTEREST, PENALTIES AND OTHER AMOUNTS: FAQ NO. 62)