Where recipient does not pay the value of service or tax thereon within 3 months of issue of invoice and he has already availed input credit based on the invoice, the said credit will be added to his output tax liability along with interest.
The input can be claimed in the subsequent month when the invoice is recieved. As GSTR-2 is not yet enabled, corrections, modifications in the purchase details can not be made. So in the subsequent month input can be claimed as clarified by the GST Circular No. 26/26/2017-GST F. No. 349/164/2017 - CBEC