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.If you have questions after reading the Instructions, please call 602-542-3026 or (within Arizona only) 800-345-5819. Starting with the 2020 taxable year, electronic filing of Arizona corporate income tax returns is required. Here is an outline of the steps you need to follow in order to form a corporation (specifically, a "C corporation") in Arizona. The business itself is not subject to federal income tax, as corporations are. LLPs and LLLPs are required to register with the Arizona Secretary of State.