Form 285C enables an individual to certify to the Department that he or she is authorized, pursuant to Arizona Revised. This letter will serve as authorization for.A taxpayer may use Form 285 to authorize ADOR to release confidential information to the taxpayer's appointee. Empower a trusted representative with an Authorization Letter. Make a free Authorization Letter in minutes with our customizable template. This form, when completed correctly, fulfills this purpose. This Authorization Letter sample is available for use on UpCounsel. Please Note: No representation is made as to the legal validity or adequacy of any form or the tax consequences thereof. It's crucial to tailor the content of the letter to meet the specific requirements of the requesting organization or authority. Court Forms and Instructions.