Maturity risk premium is the extra return an investor demands for bearing the risk of longer maturity financial instruments. This risk includes default risk, interest rate risk, and reinvestment risk. There is a close connection between maturity risk premium and interest rate risk, as the premium helps offset the risk of interest rates rising above the set rate for longer term securities. Maturity risk premium can be calculated by taking the yield on 10-year Treasury bills and subtracting the yield on 1-year Treasury bills.