EXHIBIT 99.1 DEPARTMENT OF TREASURY INTERNAL REVENUE SERVICE DISTRICT DIRECTOR P.O. BOX 2508 CINCINNATI, OH 45201 Employer Identification Number: 35-1880244 Date: July 3, 1997 DLN: MONACO COACH CORPORATION 17007077106007 C/O RICHARD B. URDA JR Person to Contact: 503 NORWEST BANK BUILDING CINDY PERRY SOUTH BEND, IN 46601 Contact Telephone Number: (513) 241-5199 Plan Name: MONACO COACH CORPORATION 401K PLAN AND TRUST Plan Number: 001 Dear Applicant: We have made a favorable determination on your plan, identified above, based on the information supplied. Please keep this letter in your permanent records. Continued qualification of the plan under its present form will depend on its effect in operation. (See section 1.401-1(b)(3) of the Income Tax Regulations.) We will review the status of the plan in operation periodically. The enclosed document explains the significance of this favorable determination letter, points out some events that may affect the qualified status of your employee retirement plan, and provides information on the reporting requirements for your plan. It also describes some events that automatically nullify it. It is very important that you read the publication. This letter relates only to the status of your plan under the Internal Revenue Code. it is not a determination regarding the effect of other federal or local statutes. This determination letter is applicable for the amendment(s) adopted on 3/12/97. This plan has been mandatorily disaggregated, permissively aggregated or restructed to satisfy the nondiscrimination requirements. This plan satisfies the nondiscrimination in amount requirement of section 1.401(a)(4)-1(b)(2) of the regulations on the basis of a design-based safe harbor described in the regulations. This plan satisfies the nondiscriminatory current availability requirements of section 1.401(a)(4)-4(b) of the regulations with respect to those benefits, rights and features that are currently available to all employees in the plan's coverage group. For this purpose, the plan's coverage group consists of those employees treated as currently benefitting for purposes of demonstrating that the plan satisfied the minimum coverage requirements of section 401(b) of the Code. Except as otherwise specified this letter may not be relied upon with respect to whether the plan satisfies the qualification requirements as amended by the Uruguay Round Agreements Act, Pub.L. 103-465 and by the Small Business Job Protection Act of 1996 (SBJPA), Pub.L. 104-108, other than the requirements of Code Section 401(a)(26). This letter considers the amendments required by the Tax Reform Act of 1986, except as otherwise specified in this letter. We have sent a copy of this letter to your representative as indicated in the power of attorney. If you have questions concerning this matter, please contact the person whose name and telephone number are shown above. Sincerely yours, District Director Enclosures: Publication 794 Reporting & Disclosure Guide for Employee Benefit Plans