EXHIBIT 12 STATE STREET CORPORATION Ratio of Earnings to Fixed Charges - --------------------------------------------------------------------------------- Three months ended Year Ended December 31, March 31, ------------------------------------------ (Dollars in millions) 2001 2000 1999 1998 1997 1996 - --------------------------------------------------------------------------------- (A) Excluding interest on deposits: Earnings: Income before income taxes................ $ 184 $ 914 $ 974 $ 662 $ 568 $ 453 Fixed charges......... 335 1,360 954 856 613 477 ----- ------- ------- ------- ------- ------ Earnings as adjusted.. $ 519 $ 2,274 $ 1,928 $ 1,518 $ 1,181 $ 930 ===== ======= ======= ======= ======= ====== Income before income taxes Pretax income from continuing operations as reported.......... $ 183 $ 906 $ 968 $ 657 $ 564 $ 447 Share of pretax income (loss) of 50% owned subsidiaries not included in above.... 1 8 6 5 4 6 ----- ------- ------- ------- ------- ------ Net income as adjusted............. $ 184 $ 914 $ 974 $ 662 $ 568 $ 453 ===== ======= ======= ======= ======= ====== Fixed charges: Interest on other borrowings........... $ 310 $ 1,268 $ 874 $ 770 $ 548 $ 452 Interest on long-term debt including amortization of debt issue costs.......... 23 82 70 66 55 15 Portion of rents representative of the interest factor in the long term lease.. 2 10 10 20 10 10 ----- ------- ------- ------- ------- ------ Fixed charges......... $ 335 $ 1,360 $ 954 $ 856 $ 613 $ 477 ===== ======= ======= ======= ======= ====== Ratio of earnings to fixed charges 1.55x 1.67x 2.02x 1.77x 1.93x 1.95x (B) Including interest on deposits:.......... Adjusted earnings from (A) above............. $ 519 $ 2,274 $ 1,928 $ 1,518 $ 1,181 $ 930 Add interest on deposits.............. 275 1,012 712 656 512 425 ----- ------- ------- ------- ------- ------ Earnings as adjusted.. $ 794 $ 3,286 $ 2,640 $ 2,174 $ 1,693 $1,355 ===== ======= ======= ======= ======= ====== Fixed charges: Fixed charges from (A) above................ $ 335 $ 1,360 $ 954 $ 856 $ 613 $ 477 Interst on deposits... 275 1,012 712 656 512 425 ----- ------- ------- ------- ------- ------ Adjusted fixed charges.............. $ 610 $ 2,372 $ 1,666 $ 1,512 $ 1,125 $ 902 ===== ======= ======= ======= ======= ====== Ratio of adjusted earnings to adjusted fixed charges....... 1.30x 1.39x 1.58x 1.44x 1.50x 1.50x - --------------------------------------------------------------------------------- 24