Under Section 87 of the Negotiable Instruments Act 1881, a material alteration of a negotiable instrument made without the consent of a party liable on it renders the instrument -

Section 87 of the Negotiable Instruments Act 1881 provides that any material alteration of a negotiable instrument renders it void as against anyone who is a party to it at the time of making such alteration and does not consent to it, unless the alteration was made in order to carry out the common intention of the original parties. Material alterations include changes to the date, the amount or the parties to the instrument. The instrument is also avoided as against any subsequent indorser where it is payable to order, while the person who made or authorised the alteration remains liable on it. The section does not make the instrument void against every party, nor voidable at the holder's choice, and the common intention exception is expressly recognised. The unconsenting party is therefore discharged.