Bank bill definition

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A bank bill (or bill) is a security that pays a single cash flow at its maturity date, at which time its entire principal is repaid. A bill pays no coupons during its lifetime.

Security description

A bank bill is structurally identical to a zero coupon bond, although the latter tend to have maturity dates of more than a year. Bank bills are also known as treasury bills, certificates of deposit (CDs), commercial paper, or promissory notes.

Security code

Bank bills have security type BILL.

Calculation of returns

A bill is treated as a zero coupon bond, which is priced by calculating the value of its single maturity cash flow, discounted at the current zero coupon interest rate for that maturity. A zero coupon bond is priced as follows:



<math>P</math> is price;

<math>y</math> is interpolated zero yield at the maturity date;

<math>t</math> is time to maturity, measured as a fraction of a year.

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