Discount basis

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This term can refer either to the cash flows of an instrument (Discount instruments) or to its basis of market quotation (Discount rate).


Example: Discount basis calculation

An instrument is quoted - on a discount basis, one period before its maturity - at a discount of 10% per period.

This means that it is currently trading at a price of 100% LESS 10% = 90% of its terminal value.

(The periodic yield on this instrument is 10% / 90% = 11.11%. So if the same instrument had been quoted on a yield basis, then the quoted yield per period = 11.11%.)


The relationship between the periodic discount rate (d) and the periodic yield (r) is:

r = d / (1 - d)

So in this case:

r = 0.10 / (1 - 0.10)

r = 0.10 / 0.90

= 11.11%


See also