All forms are in PDF format and are fillable (you can type in them). We recommend that you type the information so the documents are legible.Arizona income tax return for multi-state corporations. Electronic filing of Arizona corporate income tax returns is required for the 2020 taxable year. The Arizona Corporation Commission website provides simple, fill-in-the-blank forms for articles of incorporation, with instructions. Find out how to form an Arizona corporation. Our guide covers registration steps, legal requirements, fees, and key startup tips.