EXHIBIT 13.1

               TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LIMITED

                                  Certification

      Pursuant to 18 U.S.C. Section 1350, the undersigned, Rick Tsai, Chief
Executive Officer of Taiwan Semiconductor Manufacturing Company Limited (the
"Company"), hereby certifies, to his knowledge, that the Company's annual report
on Form 20-F for the year ended December 31, 2006 (the "Report") fully complies
with the requirements of Section 13(a) or 15(d), as applicable, of the
Securities Exchange Act of 1934, and that the information contained in the
Report fairly presents, in all material respects, the financial condition and
results of operations of the Company.

Date: April 20, 2007
                                       By: /s/ Rick Tsai
                                           ------------------------------------
                                           Name:  Rick Tsai
                                           Title: Chief Executive Officer

      The foregoing certification is being furnished solely pursuant to 18
U.S.C. Section 1350 and is not being filed as part of the Report or as a
separate disclosure document.