1934 Act Registration No. 1-14700

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2005

Taiwan Semiconductor Manufacturing Company Ltd.

(Translation of Registrant’s Name Into English)

No. 8, Li-Hsin Rd. 6,
Hsinchu Science Park,
Taiwan
(Address of Principal Executive Offices)

     (Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F þ		Form 40-F o

     (Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Form 20-F o		Form 40-F þ

     (If “Yes” is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82: ___.)

 

 

TSMC Monthly Sales Report — July 2005

Hsinchu, Taiwan, R.O.C. — August 9, 2005 — TSMC (TAIEX: 2330, NYSE: TSM) today announced that net sales for July 2005 totaled NT$20,847 million, and that revenues for January through July 2005 were NT$135,017 million.

Ms. Lora Ho, TSMC vice president and chief financial officer, noted that, “Due to continued demand recovery from our customers, wafer shipments for July 2005 increased over June 2005. As a result, net sales for July 2005 increased by 3.7 percent compared to June 2005. On a year-over-year basis, net sales for July 2005 decreased 9.9 percent.”

Sales Report:

(Unit: NT$ million)

	Net Sales			2005*			2004			Increase (Decrease) %
	July			20,847			23,148			(9.9)
	January through July			135,017			145,530			(7.2)

* Year 2005 figures have not been audited.

TSMC Spokesperson:

Ms. Lora Ho
Vice President and CFO
Tel: 886-3-566-4602

TSMC Acting Spokesperson:

Mr. J.H. Tzeng
PR Department Manager, TSMC
Tel: 886-3-666-5028
Mobile: 0928-882607
Fax: 886-3-567-0121
E-Mail: jhtzeng@tsmc.com

For further information, please contact:

Richard C.Y. Chung
Media Relations Manager, TSMC
Tel: 886-3-666-5038
Mobile: 886-911-258751
Fax: 886-3-567-0121
E-Mail: cychung@tsmc.com

Taiwan Semiconductor Manufacturing Company Limited
August 09, 2005

This is to report the changes or status of 1) sales volume, 2) funds lent to other parties, 3) endorsements and guarantees, and 4) financial derivative transactions for the period of July 2005.

1) Sales volume (in NT$ thousand)

	Period			Items			2005			2004
	Jul			Invoice amount			20,908,014			22,610,530
	Jan — Jul			Invoice amount			130,713,867			139,790,326
	Jul			Net sales			20,847,066			23,147,633
	Jan — Jul			Net sales			135,016,500			145,530,079

2) Funds lent to other parties (in NT$ thousand)

				Limit of lending			Jul			Bal. as of period end
	TSMC			83,070,696			—			—
	TSMC’s subsidiaries			31,611,024			34,020*			2,879,640

* The deviation was due to the fluctuation in currency exchange rate.

3) Endorsements and guarantees (in NT$ thousand)

				Limit of endorsements			Jul			Bal. as of period end
	TSMC			103,838,370			26,460*			2,239,720
	TSMC’s subsidiaries			N/A			—			—
	TSMC endorses for subsidiaries						26,460*			2,239,720
	TSMC’s subsidiaries endorse for TSMC						—			—
	TSMC endorses for PRC companies						—			—
	TSMC’s subsidiaries endorse for PRC companies						—			—

* The deviation was due to the fluctuation in currency exchange rate.

4)

Financial derivative transactions (in NT$ thousand) Hedging purpose (for assets / liabilities denominated in foreign currencies)

							Forward			Swap			Others
	Margin Payment						0			0			-
	Premium Income (Expense)						0			0			-
	Outstanding Contracts			Notional Amount			4,568,712			62,127,622			-
				Mark to Market Profit/Loss			(29,535)			(571,263)			-
	Expired Contracts			Notional Amount			92,078,857			153,277,421			-
				Realized Profit/Loss			258,669			651,050			-

SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Taiwan Semiconductor Manufacturing Company Ltd.

Date: August 9, 2005		By		/s/ Lora Ho
				Lora Ho         Vice President & Chief Financial Officer