* The 2-month constant maturity series begins on October 16, 2018, with the first auction of the 8-week Treasury bill. 30-year Treasury constant maturity series was discontinued on February 18, 2002 and reintroduced on February 9, 2006. From February 18, 2002 to February 8, 2006, Treasury published alternatives to a 30-year rate. Treasury bills are sold at discounted price (a price less than par price of Ksh 100) and therefore the discount is the only return an investor earns on Treasury bills. The price is computed per Kshs 100 depending on the interest rate/yield quoted by investor using the following formula: 2. Choose your Preferred Treasury Bills. For the best returns, pick your treasury bills basing on their recent rates as it’s indicative of what you’re likely to earn. The investments are made in denominations of Kshs. 50,000 with the lowest face value for each treasury bill being 100,000 Kenyan shillings.