C. 11 Reduction in invoice value on account of prepayment of usance bills Occasionally, exporters may approach authorised dealers for reduction in
invoice value on account of cash discount to overseas buyers for prepayment of
the usance bills. In such cases authorised dealers may allow cash discount to the
extent of amount of proportionate interest on the unexpired period of usance,
calculated at the rate of interest stipulated in the export contract or at the prime
rate/LIBOR of the currency of invoice where rate of interest is not stipulated in
the contract.