EXHIBIT 12



Statement Regarding Computation of Ratios



The ratios of income to fixed charges have
been computed on the basis of the total enterprise (as defined by the Commission) by dividing income before fixed charges and income taxes by fixed charges. Fixed charges consist of interest expense on all long-term and short-term borrowings,
excluding or including interest on deposits as indicated below. The computations of other ratios are evident from the information presented in this Form 10-K and the Corporations 2002 Annual Report.



BANK ONE CORPORATION and Subsidiaries

COMPUTATIONS OF CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES



|                                                                                   |  | Year Ended |        |   | Year Ended |   |        | Year Ended |  |   | Year Ended |   |  | Year Ended |       
|---------------------------------------------------------------------------------- |  | ---------- | ------ | - | ---------- | - | ------ | ---------- |  | - | ---------- | - |  | ---------- | ------
|                                                                                   |  | 2002       |        |   | 2001       |   |        | 2000(1)    |  |   | 1999       |   |  | 1998       |       
|(In millions, except ratios)                                                       |  |            |       
|EXCLUDING INTEREST ON DEPOSITS:                                                    |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Pretax income from continuing operations                                           |  | $          | 4,763  |   |            | $ | 3,800  |            |  | $ | (1,080     | ) |  | $          | 4,974 
|Earnings (loss) from unconsolidated entities under the equity method of
accounting |  |            | 91     |   |            |   | (80    | )          |  |   | (129       | ) |  |            | (47   
|Fixed charges, excluding capitalized interest                                      |  |            | 2,720  |   |            |   | 3,868  |            |  |   | 5,198      |   |  |            | 3,719 
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Adjusted pretax earnings base                                                      |  |            | 7,574  |   |            |   | 7,588  |            |  |   | 3,989      |   |  |            | 8,646 
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Interest, excluding interest on deposits                                           |  |            | 2,621  |   |            |   | 3,771  |            |  |   | 5,105      |   |  |            | 3,622 
|Rental factor                                                                      |  |            | 99     |   |            |   | 96     |            |  |   | 93         |   |  |            | 97    
|Capitalized interest                                                               |  |            | 1      |   |            |   | 4      |            |  |   | 9          |   |  |            | 2     
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Fixed charges                                                                      |  |            | 2,721  |   |            |   | 3,871  |            |  |   | 5,207      |   |  |            | 3,721 
|Consolidated ratios of earnings to fixed charges, excluding interest on
deposits   |  |            | 2.8    | x |            |   | 2.0    | x          |  |   | 0.8        | x |  |            | 2.3   
|                                                                                  
|INCLUDING INTEREST ON DEPOSITS:                                                    |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Pretax income from continuing operations                                           |  | $          | 4,763  |   |            | $ | 3,800  |            |  | $ | (1,080     | ) |  | $          | 4,974 
|Earnings (loss) from unconsolidated entities under the equity method of
accounting |  |            | 91     |   |            |   | (80    | )          |  |   | (129       | ) |  |            | (47   
|Fixed charges, excluding capitalized interest                                      |  |            | 5,439  |   |            |   | 8,763  |            |  |   | 11,335     |   |  |            | 8,370 
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Adjusted pretax earnings base                                                      |  |            | 10,293 |   |            |   | 12,483 |            |  |   | 10,126     |   |  |            | 13,297
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Interest, including interest on deposits                                           |  |            | 5,340  |   |            |   | 8,666  |            |  |   | 11,242     |   |  |            | 8,273 
|Rental factor                                                                      |  |            | 99     |   |            |   | 96     |            |  |   | 93         |   |  |            | 97    
|Capitalized interest                                                               |  |            | 1      |   |            |   | 4      |            |  |   | 9          |   |  |            | 2     
|                                                                                   |  |            |        |   |            |   |        |            |  |   |            |   |  |            |       
|Fixed charges                                                                      |  |            | 5,440  |   |            |   | 8,766  |            |  |   | 11,344     |   |  |            | 8,372 
|Consolidated ratios of earnings to fixed charges, including interest on
deposits   |  |            | 1.9    | x |            |   | 1.4    | x          |  |   | 0.9        | x |  |            | 1.6   

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|(1) |  | Results for the year ended December 31, 2000 were insufficient to cover fixed charges. The coverage deficiency was approximately $1.2 billion.
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