INSTRUCTIONS: ARIZONA CORPORATION INCOME TAX RETURN (SHORT FORM) INSTRUCTIONS (Form 120A) Corporations operating within Arizona whose income is solely taxable within the state can use a form 120A to file their tax returns. This is a simplified, short from tax form. This article discusses the instructions for completing this form, which can be found on the website of the Arizona Department of Revenue. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 1: The first page contains general instructions for filling out this form, including which types of entities may file. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 2: The second page contains the majority of the instructions for making estimated tax payments, as well as instructions for how to file an extension of time to file your return and information about penalties and interest. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 3: The third page has more instructions about penalties and interest, as well as information about records, furnishing data and filing amended returns. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 4: Specific, line-by-line instructions begin on the fourth page. This page discusses lines 1 through 7, which concern computation of Arizona taxable income. Lines 8 through 11 concerning initial computation of tax are also discussed. This page also begins discussing line 12, which concerns nonrefundable tax credits. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 5: The fifth page concludes discussion of line 12, then discusses other types of credits as documented on lines 13 through 15. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 6: The sixth page discusses lines 17 through 26, which arrive at your total due. This page also begins discussing how to submit payment. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 7: The seventh page continues discussing payment methods and begins discussing Schedule A, concerning additions to taxable income. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 8: The eighth page continues discussion of Schedule A. Arizona Corporation Income Tax Return (Short Form) Instructions 120A Step 9: The ninth page concludes discussion of Schedule A and begins discussion of Schedule B, which concerns subtractions to taxable income. This discussion continues through the eleventh page, which also discusses Schedule C, which concerns additional information.