ITC input reverse due to non payment within 180 days

As per 2nd proviso to Section 16(2) of the CGST Act,

Provided further that where a recipient fails to pay to the supplier of goods or services or both, other than the supplies on which tax is payable on reverse charge basis, the amount towards the value of supply along with tax payable thereon within a period of one hundred and eighty days from the date of issue of invoice by the supplier, an amount equal to the input tax credit availed by the recipient shall be added to his output tax liability, along with interest thereon, in such manner as may be prescribed.

As per Rule 37 of CGST Rules,

Reversal of input tax credit in the case of non-payment of consideration.-(1)A registered person, who has availed of input tax credit on any inward supply of goods or services or both, but fails to pay to the supplier thereof, the value of such supply along with the tax payable thereon, within the time limit specified in the second proviso to sub-section(2) of section 16, shall furnish the details of such supply, the amount of value not paid and the amount of input tax credit availed of proportionate to such amount not paid to the supplier in FORM GSTR-2 for the month immediately following the period of one hundred and eighty days from the date of the issue of the invoice.

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