What is a forged instrument? (Cheque/bill/Promissory note)

An instrument (negotiable instrument like cheque/bill of exchange/promissory note) is called forged instrument when forgery takes place in signature of the drawer, signature of the endorser, and alteration in name of the payee, alteration in amount, alteration in date etc. validated by forged signature.  A forged instrument is meaningless as far as drawer/endorser whose signature…