Page 1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X]	ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES 	EXCHANGE ACT OF 1934 	For the fiscal year ended December 31, 2004 OR [ ]	TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE 	SECURITIES EXCHANGE ACT OF 1934 	For the transition period from _______________ to _______________ 	Commission file number 001-9383 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: 	 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: 	 Westamerica Bancorporation 	 	 1108 Fifth Avenue 		 San Rafael, California 94901 Page 2 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) FINANCIAL STATEMENTS AS OF DECEMBER 31, 2004 AND 2003 AND FOR THE YEARS ENDED DECEMBER 31, 2004, 2003 AND 2002 AND SUPPLEMENTAL SCHEDULES AS OF AND FOR THE YEAR ENDED DECEMBER 31, 2004 AND REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Page 3 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) FINANCIAL STATEMENTS WITH SUPPLEMENTAL SCHEDULES For the Years Ended December 31, 2004, 2003 and 2002 TABLE OF CONTENTS Page ---- Report of Independent Registered Public Accounting Firm 4 Financial Statements: Statement of Net Assets Available for Benefits as of December 31, 2004 and 2003 5 Statement of Changes in Net Assets Available for Benefits for the Years Ended December 31, 2004, 2003 and 2002 6 Notes to Financial Statements 7-13 Supplemental Schedules: Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year) as of December 31, 2004 14 Schedule H, Line 4j - Schedule of Reportable Transactions for the Year Ended December 31, 2004 15 Signatures 16 Exhibit Index 17 All other schedules required by Section 2520.103.10 of the Department of Labor's Rules and regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable. Page 4 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM ------------------------------------------------------- To the Employee Benefits and Compensation Committee of the Board of Directors of Westamerica Bancorporation We have audited the accompanying statement of net assets available for benefits of the Westamerica Bancorporation Tax Deferred Savings/Retirement Plan (ESOP) (the "Plan") as of December 31, 2004 and 2003, and the related statement of changes in net assets available for benefits for the years ended December 31, 2004, 2003 and 2002. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan's internal control over financial reporting. Accordingly, we express no such opinion. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Westamerica Bancorporation Tax Deferred Savings/Retirement Plan (ESOP) as of December 31, 2004 and 2003, and the changes in net assets available for benefits for the years ended December 31, 2004, 2003 and 2002, in conformity with accounting principles generally accepted in the United States of America. Our audits were made for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of assets (held at end of year) and reportable transactions, as of and for the year ended December 31, 2004, are presented for the purpose of additional analysis and are not a required part of the basic financial statements, but are supplementary information required by the United States Department of Labor Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. These supplemental schedules are the responsibility of the Plan's management. The supplemental schedules have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole. /S/ Perry-Smith LLP ------------------- Sacramento, California June 3, 2005 400 CAPITOL MALL, SUITE 1200, SACRAMENTO, CA 95814 916-441-1000 FAX 916-441-1110 URL www.perry-smith.com Page 5 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS December 31, 2004 and 2003 2004 2003 ------------------------ ASSETS Cash $ 7,084 $ 17,833 ------------------------ Investments: Westamerica common stock (Notes 3 and 4) 41,154,841 35,081,251 Shares of registered investment companies (mutual funds) (Note 3) 19,446,407 17,268,494 Participant loans (Note 3) 1,143,215 1,154,771 ------------------------ Total investments 61,744,463 53,504,516 ------------------------ Receivables: Interest 50 20 ------------------------ Total assets 61,751,597 53,522,369 ------------------------ LIABILITIES Accrued trustee fees 14,013 12,782 ------------------------ Net assets available for benefits $61,737,584 $53,509,587 =========== =========== The accompanying notes are an integral part of these financial statements. Page 6 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS For the Years Ended December 31, 2004, 2003 and 2002 2004 2003 2002 ------------------------------------- ADDITIONS Investment income: Net appreciation (depreciation) in fair value of investments (Note 3) $ 7,418,432 $ 9,651,775 $(1,859,827) Interest 340,738 249,478 267,035 Dividends 764,818 724,410 632,186 Interest on participant loans 61,938 68,278 71,718 ------------------------------------- Total investment income (loss) 8,585,926 10,693,941 (888,888) ------------------------------------- Contributions: Participants 2,313,392 2,269,775 2,234,006 Employer 1,508,125 1,508,203 1,534,153 Participant rollovers 225,627 16,877 189,564 ------------------------------------- Total contributions 4,047,144 3,794,855 3,957,723 ------------------------------------- Total additions 12,633,070 14,488,796 3,068,835 ------------------------------------- DEDUCTIONS Deductions from net assets attributed to: Benefits paid to participants 4,353,746 3,356,904 4,692,247 Administrative expenses (Note 6) 51,327 46,916 44,115 ------------------------------------- Total deductions 4,405,073 3,403,820 4,736,362 ------------------------------------- Net increase (decrease) 8,227,997 11,084,976 (1,667,527) ------------------------------------- Net assets available for plan benefits: Beginning of year 53,509,587 42,424,611 44,092,138 ------------------------------------- End of year $ 61,737,584 $53,509,587 $42,424,611 =========== =========== =========== The accompanying notes are an integral part of these financial statements. Page 7 	WESTAMERICA BANCORPORATION 	TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) 	NOTES TO FINANCIAL STATEMENTS 1.	DESCRIPTION OF PLAN The following description of the Westamerica Bancorporation (the "Company") Tax Deferred Savings/Retirement Plan (ESOP) (the "Plan") provides only general information. Participants should refer to the Summary Plan Description and Plan Agreement for a more complete description of the Plan's provisions. General - ------- The Plan, formerly called the Westamerica Bancorporation Supplemental Retirement Plan, was established by the Company as a non-contributory profit sharing plan. The Plan was amended to included a salary deferral feature pursuant to section 401(k) of the Internal Revenue Code. Concurrent with the amendment, all existing account balances were invested in either common stock or certificates of deposit of the Company, and all employee accounts were fully vested. The Plan was also amended and restated as an Employee Stock Ownership Plan (ESOP). The Employee Benefits and Compensation Committee of the Company's Board of Directors (the "Committee") delegates to the Company's Pension Management Committee, the administration of the Plan. The Committee has the responsibility for the general operation of the Plan, including the resolution of any questions arising under the Plan agreement. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). Investments in the Plan are participant directed with the exception of employer contributions which are invested in shares of Company common stock. Vanguard Fiduciary Trust Company serves as Trustee of the Plan. Eligibility - ----------- Under the Plan, employees of the Company who are compensated on a salaried basis become eligible to participate in the plan on the first day of the calendar month coinciding with or following the date the employee completes 90 consecutive days of service with the Company or completes 1,000 service hours in a 12-month consecutive period. Vesting - ------- Participants are immediately vested in their salary-deferral contributions, the Company's discretionary and matching contributions, plus actual earnings thereon. Contributions - ------------- Each year, participants may make salary deferral contributions, through payroll deduction, in any whole percentage up to 25 percent of pretax annual compensation subject to certain IRC limitations. The Company's matching contribution is 100 percent of the participant's elective contribution, up to a maximum of 6 percent of the participant's compensation. Additional amounts may be contributed at the discretion of the Company's Board of Directors. Participants may also contribute amounts representing distributions from other qualified defined benefit or contribution plans. For the years ended December 31, 2004, 2003 and 2002, the Company made no discretionary contributions. Company contributions are subject to certain IRC limitations. Page 8 1.	DESCRIPTION OF PLAN (Continued) Participant Accounts - -------------------- Individual accounts are maintained for each Plan participant. Each Participant's account is credited with the participant's contribution, the Company's discretionary and matching contributions and Plan earnings, and charged with withdrawals, allocations of Plan losses and administrative expenses. Allocations are based on participant earnings, as defined. Certain administrative expenses associated with the Westamerica Common Stock Fund are charged pro-rata based on a participant's holding in that fund. Participants' Investment Options - -------------------------------- Company matching contributions are invested in the Westamerica Common Stock Fund in accordance with the Plan Document. A participant who has completed 10 Plan years of service and has attained age 55 may elect to direct up to 25% of the Company matching contribution held in Company stock to other investment fund options. Participants direct participant contributions in whole or in part in any of the following investment fund options: 	The Westamerica Common Stock Fund, which is invested in the Company's common stock and temporary interest-bearing money market funds. 	Vanguard 500 Index Fund, which invests in the 500 stocks that make up the unmanaged Standard & Poor's 500 Composite Stock Price Index, a widely recognized benchmark of U.S. stock market performance. 	Vanguard LifeStrategy Conservative Growth Fund, which invests in five Vanguard funds: a domestic stock fund, an international stock fund, two bonds funds, and an asset allocation fund. The fund's assets allocation ranges are expected to be 25%-50% stocks, 50%-75% bonds, and 0%-25% cash investments. 	Vanguard LifeStrategy Growth Fund, which invests in five Vanguard funds: a domestic stock fund, an international stock fund, two bond funds, and an asset allocation fund. The fund's assets allocation ranges are expected to be 65%-90% stocks, 10%-35% bonds and 0%-25% cash investments. 	Vanguard LifeStrategy Income Fund, which invests in four Vanguard funds: a stock fund, two bond funds, and an asset allocation fund. The fund's assets allocation ranges are expected to be 5%-30% stocks, 70%-95% bonds, and 0%-25% cash investments. 	Vanguard Explorer Fund, which invests in a diversified group of small-company stocks with prospects for above-average growth. The fund may invest up to 20% in foreign securities and up to 15% in restricted or illiquid securities. Page 9 1.	DESCRIPTION OF PLAN (Continued) Participants' Investment Options (Continued) - -------------------------------- 	Vanguard LifeStrategy Moderate Growth Fund, which invests in four Vanguard funds: a domestic stock fund, an international stock fund, a bond fund, and an asset allocation fund. The fund's assets allocation ranges are expected to be 45%-70% stocks, 30%-55% bonds, and 0%-25% cash investments. 	Vanguard Morgan Growth Fund, which invests primarily in stocks of large and mid-sized companies that have strong records of growth in sales and earnings or that have performed well during certain market cycles. 	Vanguard Prime Money Market Fund, which invests in short-term, high- quality money market instruments issued by financial institutions, nonfinancial corporations, the U.S. government, and federal agencies. 	Vanguard Total Bond Market Index Fund, which invests in bonds that attempt to match the performance of the unmanaged Lehman Brothers Aggregate Bond Index, which is a widely recognized measure of the taxable U.S. bond market. 	Vanguard Total International Stock Index, which invests in three Vanguard international index funds: a European fund, a Pacific fund, and an emerging markets fund. These funds invest in the stock of companies in more than 30 countries. 	Vanguard Windsor II Fund, which invests in a diversified group of out-of-favor stocks of large capitalization companies. The stocks selected generally sell at prices below the market average compared to their dividend income and future return potential. 	Vanguard Extended Market Index Fund, which invests in a broadly diversified portfolio of stocks of small and medium sized companies that are regularly traded on the New York and American Stock Exchanges and NASDAQ over-the-counter market. The portfolio is designed to be representative of the Wilshire 4500 Index. 	Vanguard Short-Term Federal Fund which invests primarily in short- term securities issued by U.S. government agencies, but may also invest in U.S. Treasury securities and in repurchase agreements backed by U.S. Treasury or federal agency securities. To reduce fluctuations in its share price, the fund will maintain an average maturity of 1 to 3 years. Participants may change their investment options at any time directly through The Vanguard Group. Page 10 1.	DESCRIPTION OF PLAN (Continued) Participant Loans Participants may borrow a minimum of $1,000 up to a maximum equal to the lesser of 50 percent of their account balance, 100 percent of participant contributions, or $50,000. Loans are secured by the balance in the participant's account and bear interest at prevailing market rates at the time the funds are borrowed. Loan terms range from 1 to 5 years. Principal and interest is paid ratably through payroll deductions. Payment of Benefits Upon termination of service for any reason, a participant may elect to receive a lump-sum distribution equal to the value in his or her account. Distributions for the value of a participant's account invested in the Westamerica Common Stock Fund stock are made in the form of the Company's common stock plus cash for any fractional shares or, if a participant elects, in cash or an in-kind transfer, as provided by the Plan document. Participants may also receive in-service distributions on account of hardship or after attaining age 59 1/2. As of December 31, 2004 and 2003, there were no benefits payable to participants that have elected to withdraw from the Plan but have not yet been paid. Voting Rights Each participant is entitled to exercise voting rights attributable to the shares allocated to his or her account and is notified by the Trustee prior to the time that such rights are to be exercised. The Trustee is not permitted to vote any allocated share for which instructions have not been given by a participant. Plan Termination Although it has not expressed any interest to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan, subject to the provisions of ERISA. Administrative Expenses The Company provides bookkeeping and other administrative services for the Plan at no charge. The Company pays the Plan's annual account maintenance fees for active employees and other administrative expenses. 2.	SUMMARY OF ACCOUNTING POLICIES Basis of Accounting The financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America. Page 11 2.	SUMMARY OF ACCOUNTING POLICIES (Continued) Use of Estimates - ---------------- The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Plan's management to make estimates and assumptions that affect the reported amounts of net assets available for benefits and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. The Plan utilizes various investment instruments, including mutual funds. Investment securities, in general, are exposed to various risks, such as interest rate, credit and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the amounts reported in the financial statements. Investment Valuation and Income Recognition - ------------------------------------------- The Plan's investments are stated at fair value. Shares of registered investment companies (mutual funds) are reported at fair value based on the quoted market price of the fund, which represents the net asset value of shares held by the Plan at year end. The Company's common stock is valued at its quoted market price. Participant loans are valued at their outstanding loan balances. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation (depreciation) in fair value of investments includes net unrealized market appreciation (depreciation) of investments and net realized gains and losses on the sale of investments during the period. Management fees and operating expenses charged to the Plan for investments in shares of registered investment companies (mutual funds) are deducted from income earned on a daily basis and are not separately reflected. Consequently, management fees and operating expenses are reflected as a reduction of investment return for such investments. Payment of Benefits - ------------------- Benefits are recorded when paid. Page 12 3. INVESTMENT INFORMATION The Plan's investments, including investments bought, sold, and held during the year, appreciated in value by $7,418,432 and $9,651,775 during 2004 and 2003, respectively, and depreciated in value by $1,859,827 during 2002, as follows: 2004 2003 2002 ----------------------------------- Westamerica common stock $ 6,047,876 $ 6,988,077 $ 483,400 Mutual funds 1,370,556 2,663,698 (2,343,227) ----------------------------------- $ 7,418,432 $ 9,651,775 $(1,859,827) =========== =========== =========== The following table presents investments at fair value that represent 5% or more of the Plan's net assets as of December 31, 2004 and 2003: 2004 2003 ----------------------- Westamerica Common Stock Fund $41,154,841 $35,081,251 Vanguard 500 Index Fund 4,965,703 4,851,183 Vanguard Prime Money Market Fund 2,610,457 2,712,196 Other Investments 13,013,462 10,859,886 ----------------------- $61,744,463 $53,504,516 =========== =========== 4. INVESTMENT IN WESTAMERICA BANCORPORATION COMMON STOCK The Plan's investments at December 31, 2004 and 2003 in Westamerica Bancorporation common stock are as follows: 2004 2003 ----------------------- Participant directed: Number of shares 705,553 705,860 =========== =========== Cost $16,941,726 $15,200,542 =========== =========== Fair value $41,154,841 $35,081,251 =========== =========== Page 13 5.	FEDERAL INCOME TAX STATUS The Internal Revenue Service has determined and informed the Company by a letter dated December 12, 2001, that the Plan is qualified and the trust established under the Plan is tax-exempt, under the appropriate sections of the Internal Revenue Code. The Plan has been amended since receiving the determination letter; however, the Plan's management and the Plan's tax counsel believe that the Plan currently is designed and being operated in compliance with the applicable requirements of the Internal Revenue Code and the Plan continues to be tax exempt. Therefore, no provision for income taxes has been included in the Plan's financial statements. 6.	RELATED PARTY TRANSACTIONS Plan investments include shares of mutual funds managed by an affiliate of Vanguard Fiduciary Trust Company (VFTC). VFTC is the trustee as defined by the Plan and, therefore, these transactions qualify as party-in- interest transactions which are exempt from the prohibited transactions rules. Fees paid by the Plan for investment management services were included as a reduction of the return earned on each fund. Fees paid by the Plan for trustee services in connection with the Westamerica Common Stock Fund for the years ended December 31, 2004, 2003 and 2002 amounted to $51,327, $46,916 and $44,115, respectively. Page 14 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) EMPLOYER IDENTIFICATION NUMBER: 94-2156203 PLAN NUMBER: 002 FORM 5500, SCHEDULE H, PART IV, LINE 4i SCHEDULE OF ASSETS (HELD AT END OF YEAR) December 31, 2004 (c) (b) Description of Investment Identity of Issuer, Including Maturity Date, (e) Borrower, Lessor Rate of Interest, Collate (d) Current (a) or Similar Party Par or Maturity Value Cost Value - ---------------------------------------------------------------------------------------- * Westamerica Common Mutual Fund Stock Fund 705,553 shares $16,941,726 $ 41,154,841 * Vanguard 500 Index Fund Mutual Fund 44,480 shares 4,880,993 4,965,703 * Vanguard Explorer Fund Mutual Fund 2,453 shares 165,880 182,954 * Vanguard LifeStrategy Mutual Fund Conservative Growth Fund 70,169 shares 1,009,813 1,070,778 * Vanguard LifeStrategy Mutual Fund Growth Fund 97,549 shares 1,802,187 1,954,883 * Vanguard LifeStrategy Mutual Fund Income Fund 38,361 shares 499,034 519,026 * Vanguard LifeStrategy Mutual Fund Moderate Growth Fund 102,377 shares 1,672,032 1,833,580 * Vanguard Morgan Growth Mutual Fund Fund 162,149 shares 2,764,208 2,646,273 * Vanguard Prime Money Mutual Fund Market Fund 2,610,457 shares 2,610,457 2,610,457 * Vanguard Total Bond Market Mutual Fund Index Fund 80,642 shares 821,097 828,198 * Vanguard Total International Mutual Fund Stock Index Fund 110,467 shares 1,080,866 1,391,883 * Vanguard Windsor II Fund Mutual Fund 26,094 shares 653,502 800,945 * Vanguard Extended Market Mutual Fund Index Fund 15,949 shares 424,659 500,169 * Vanguard Short Term Mutual Fund Federal Fund 13,598 shares 143,799 141,558 * Participant loans Interest rates ranging 1,143,215 1,143,215 from 5.00% to 9.75% --------------------------- $36,613,468 $ 61,744,463 ============ ============ * Party-in-interest to the Plan. Page 15 WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS EMPLOYER IDENTIFICATION NUMBER: 94-2156203 PLAN NUMBER: 002 SCHEDULE H, LINE 4j - SCHEDULE OF REPORTABLE TRANSACTIONS For the Year Ended December 31, 2004 (h) (f) Current Value (a) (b) (c) (d) (e) Expense (g) of Asset on (i) Identity of Description Purchase Selling Lease Incurred wit Cost of Transaction Net Gain Party Involved of Asset Price Price Rental Transaction Asset Date or (Loss) - -------------------------------------------------------------------------------------------------------------------------- Category (1) - ------------------------------------------- Purchases - Series of Transactions - ------------------------------------------- Westamerica Bancorporation: Westamerica Common Stock Common stock $ 3,312,479 $ 3,312,479 Sales - Series of Transactions - ------------------------------------------- Westamerica Bancorporation: Westamerica Common Stock Common stock $ 3,250,680 $ 1,571,295 $ 3,250,880 $ 1,679,585 Page 16 Duly Authorized Signature Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or the persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. WESTAMERICA BANCORPORATION TAX DEFERRED SAVINGS/RETIREMENT PLAN (ESOP) Date: June 29, 2005 ------------------------- By: /s/ Dennis R. Hansen ------------------------- Dennis R. Hansen Senior Vice President and Controller and Member, Pension Management Committee Page 17 Exhibit Index Exhibit Number 		Description - -------- ------------------------------------------------ 23 Independent Auditor's Consent 99 Certification pursuant to 18 U.S.C. Section 1350