EXHIBIT 12

             COMPUTATION OF RATIO OF NET INCOME TO FIXED CHARGES AND
       NET INCOME TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS
                       FOR NINE MONTHS ENDED SEPTEMBER 30
                                   (UNAUDITED)

<Table>
<Caption>
(Dollars in millions)

                                                       2001          2000
                                                       ----          ----
                                                              
Income before income taxes (1)                        $7,684        $7,711

Add:  Fixed charges, excluding
   capitalized interest                                1,314         1,379
                                                      ------        ------

Income as adjusted before income taxes                $8,998        $9,090
                                                      ======        ======

Fixed charges:
   Interest expense                                   $  973        $1,050
   Capitalized interest                                   24            23
   Portion of rental expense representative of
     interest                                            341           329
                                                      ------        ------

Total fixed charges                                   $1,338        $1,402
                                                      ======        ======
Preferred stock dividends (2)                             14            21
                                                      ------        ------

Combined fixed charges and preferred stock
   dividends                                          $1,352        $1,423
                                                      ======        ======

Ratio of net income to fixed charges                    6.72          6.48

Ratio of net income to combined fixed charges
and preferred stock dividends                           6.66          6.39
</Table>

(1) Income before income taxes excludes the company's share in the income and
losses of less-than-fifty percent-owned affiliates.

(2) Included in the ratio computation are preferred stock dividends of $10
million for the first nine months of 2001 and $15 million for the first nine
months of 2000, or $14 million and $21 million, respectively, representing the
pre-tax income that would be required to cover those dividend requirements based
on the company's effective tax rate for the nine months ended September 30, 2001
and 2000.


                                     - 26 -
<Page>

                               SEGMENT INFORMATION
                                   (UNAUDITED)

<Table>
<Caption>
                                                                           Hardware Segments
                                                            -------------------------------------------------
                                                                            Personal and
                                               Global                         Printing          Enterprise
(Dollars in millions)                         Services      Technology         Systems           Systems
- -------------------------------------------------------------------------------------------------------------
THREE MONTHS ENDED SEPTEMBER 30, 2001:
                                                                                    
External revenue                               $8,682         $ 1,654          $ 2,829          $ 3,056
Internal revenue                                  684             628               18              175
                                               ------         -------          -------          -------
Total revenue                                  $9,366         $ 2,282          $ 2,847          $ 3,231
                                               ======         =======          =======          =======
Pre-tax income (loss)                          $1,373         $  (258)         $   (70)         $   194
                                               ======         =======          =======          =======
Revenue year-to-year change                       5.4%          (21.9)%          (28.7)%           (2.2)%
Pre-tax income year-to-year change               19.7%         (242.5)%         (179.5)%          (29.2)%
Pre-tax income margin                            14.7%          (11.3)%           (2.5)%            6.0%

THREE MONTHS ENDED SEPTEMBER 30, 2000*:

External revenue                               $8,230         $ 2,250          $ 3,971          $ 3,164
Internal revenue                                  654             672               22              138
                                               ------         -------          -------          -------
Total revenue                                  $8,884         $ 2,922          $ 3,993          $ 3,302
                                               ======         =======          =======          =======
Pre-tax income (loss)                          $1,147         $   181          $    88          $   274
                                               ======         =======          =======          =======

Pre-tax income margin                            12.9%            6.2%             2.2%             8.3%
</Table>

*     Reclassified to conform with 2001 presentation.

RECONCILIATIONS TO IBM AS REPORTED:

<Table>
<Caption>
                                         Three Months Ended        Three Months Ended
(Dollars in millions)                    September 30, 2001        September 30, 2000
                                         ------------------       -------------------
                                                                 
Revenue:
Total reportable segments                     $ 22,424                 $ 23,601
Eliminations/other                              (1,996)                  (1,820)
                                              --------                 --------
    Total IBM Consolidated                    $ 20,428                 $ 21,781
                                              ========                 ========

Pretax income:
Total reportable segments                     $  2,181                 $  2,444
Eliminations/other                                  81                      360
                                              --------                 --------
    Total IBM Consolidated                    $  2,262                 $  2,804
                                              ========                 ========
</Table>


                                     - 27 -
<Page>

<Table>
<Caption>
                                                                      Global            Enterprise           Total
(Dollars in millions)                            Software            Financing          Investments         Segments
- --------------------------------------------------------------------------------------------------------------------
THREE MONTHS ENDED SEPTEMBER 30, 2001:
                                                                                                
External revenue                                $    3,201            $   814             $ 242             $ 20,478
Internal revenue                                       236                204                 1                1,946
                                                ----------            -------             -----             --------
Total revenue                                   $    3,437            $ 1,018             $ 243             $ 22,424
                                                ==========            =======             =====             ========
Pre-tax income (loss)                           $      704            $   314             $ (76)            $  2,181
                                                ==========            =======             =====             ========

Revenue year-to-year change                            9.8%              (6.9)%           (12.6)%               (5.0)%
Pre-tax income year-to-year change                    36.7%               6.8%            (38.2)%              (10.8)%
Pre-tax income margin                                 20.5%              30.8%            (31.3)%                9.7%

THREE MONTHS ENDED SEPTEMBER 30, 2000*:

External revenue                                $    2,918            $   868             $ 277             $ 21,678
Internal revenue                                       211                225                 1                1,923
                                                ----------            -------             -----             --------
Total revenue                                   $    3,129            $ 1,093             $ 278             $ 23,601
                                                ==========            =======             =====             ========
Pre-tax income (loss)                           $      515            $   294             $ (55)            $  2,444
                                                ==========            =======             =====             ========

Pre-tax income margin                                 16.5%              26.9%            (19.8%)               10.4%
</Table>


                                     - 28 -
<Page>

                               SEGMENT INFORMATION
                                   (UNAUDITED)

<Table>
<Caption>
                                                                           Hardware Segments
                                                            -------------------------------------------------
                                                                            Personal and
                                               Global                         Printing          Enterprise
(Dollars in millions)                         Services      Technology         Systems           Systems
- -------------------------------------------------------------------------------------------------------------
NINE MONTHS ENDED SEPTEMBER 30, 2001:
                                                                                         
External revenue                              $25,895         $ 6,091          $  9,072              $ 9,669
Internal revenue                                1,923           1,795                50                  547
                                              -------         -------          --------              -------
Total revenue                                 $27,818         $ 7,886          $  9,122              $10,216
                                              =======         =======          ========              =======
Pre-tax income (loss)                         $ 3,748         $   (81)         $   (136)             $ 1,111
                                              =======         =======          ========              =======

Revenue year-to-year change                       7.8%           (1.4)%           (16.0)%                2.4%
Pre-tax income year-to-year change               16.6%         (120.9)%              nm                  6.3%
Pre-tax income margin                            13.5%           (1.0)%            (1.5)%               10.9%

NINE MONTHS ENDED SEPTEMBER 30, 2000*:

External revenue                              $23,966         $ 5,826          $ 10,820              $ 9,500
Internal revenue                                1,849           2,172                44                  475
                                              -------         -------          --------              -------
Total revenue                                 $25,815         $ 7,998          $ 10,864              $ 9,975
                                              =======         =======          ========              =======
Pre-tax income (loss)                         $ 3,214         $   388          $     (4)             $ 1,045
                                              =======         =======          ========              =======

Pre-tax income margin                            12.5%            4.9%             (0.0)%               10.5%
</Table>

nm - not meaningful

*     Reclassified to conform with 2001 presentation.

RECONCILIATIONS TO IBM AS REPORTED:

<Table>
<Caption>
                                          Nine Months Ended        Nine Months Ended
(Dollars in millions)                    September 30, 2001        September 30, 2000
                                         ------------------       -------------------
                                                                 
Revenue:
Total reportable segments                    $ 68,800                  $ 68,436
Eliminations/other                             (5,760)                   (5,656)
                                             --------                  --------
    Total IBM Consolidated                   $ 63,040                  $ 62,780
                                             ========                  ========

Pretax income:
Total reportable segments                    $ 7 ,278                  $  7,153
Eliminations/other                                375                       594
                                             --------                  --------
Total IBM Consolidated                       $  7,653                  $  7,747
                                             ========                  ========
</Table>


                                     - 29 -
<Page>

<Table>
<Caption>
                                                                         Global            Enterprise           Total
(Dollars in millions)                               Software            Financing          Investments         Segments
- -----------------------------------------------------------------------------------------------------------------------
NINE MONTHS ENDED SEPTEMBER 30, 2001:
                                                                                                     
External revenue                                   $   9,155             $ 2,486              $ 782              $63,150
Internal revenue                                         686                 647                  2                5,650
                                                   ---------             -------              -----              -------
Total revenue                                      $   9,841             $ 3,133              $ 784              $68,800
                                                   =========             =======              =====              =======
Pre-tax income (loss)                              $   2,001             $   878              $(243)             $ 7,278
                                                   =========             =======              =====              =======

Revenue year-to-year change                              2.3%               (2.7)%            (16.8)%                0.5%
Pre-tax income year-to-year change                       9.2%               (1.1)%            (15.7)%                1.7%
Pre-tax income margin                                   20.3%               28.0%             (31.0)%               10.6%

NINE MONTHS ENDED SEPTEMBER 30, 2000*:

External revenue                                   $   9,027             $ 2,525              $ 939              $62,603
Internal revenue                                         595                 695                  3                5,833
                                                   ---------             -------              -----              -------
Total revenue                                      $   9,622             $ 3,220              $ 942              $68,436
                                                   =========             =======              =====              =======
Pre-tax income (loss)                              $   1,832             $   888              $(210)             $ 7,153
                                                   =========             =======              =====              =======

Pre-tax income margin                                   19.0%               27.6%             (22.3)%               10.5%
</Table>


                                     - 30 -