united parcel service , inc . and subsidiaries notes to consolidated financial statements 8.375% ( 8.375 % ) debentures the 8.375% ( 8.375 % ) debentures consist of two separate tranches , as follows : 2022 $ 276 million of the debentures have a maturity of april 1 , 2030 . these debentures have an 8.375% ( 8.375 % ) interest rate until april 1 , 2020 , and , thereafter , the interest rate will be 7.62% ( 7.62 % ) for the final 10 years