When to Take GST Input

You can take credit in March 2018 Month GSTR-3B,

Also, if in case you forget you to take ITC, then you can take such ITC till 180 Days from the Date of Invoice.

 Pl refer to section 16(2) of CGST Act. 

You can visit following blog to resolve your queries. Unclear for ITC utilisation under GST?

Also, contact experts at LegalWiz.in for any assistance required at 1800-313-4151 or drop an e-mail at support @ legalwiz.in.