The Bills of Exchange Act 1908 sets the legal rules for three main paper-based payment instruments: bills of exchange, cheques on a bank, and promissory notes.
It also deals with related issues such as acceptance, endorsement, negotiation, presentment, dishonour, discharge, lost instruments, good faith and some conflict of laws questions.
For a modern business, the Act is most relevant when a payment document is being relied on as a formal instrument rather than just evidence of a debt. That can happen in trade credit, private lending, debt recovery, banking disputes, or where a cheque is crossed, dishonoured, transferred or paid through a bank collection process.