The Laws.com legal forms guide provides information on how to file a Missouri corporation income franchise tax return for corporations doing business in Missouri. This tax return is filed using a form MO-1120, which can be found on the website of the Missouri Department of Revenue. - The first step in filling out the form is to provide your corporation's name, address, state tax ID number, charter number, and federal ID number. - In step 2, you need to check the next to the statement indicating the type of return you are filing and enter the balance sheet date. Additionally, a copy of your federal income tax return must be attached with your filed state return. - On line 1, you should enter your federal taxable income. On line 2, enter your corporation income tax from all states deducted when determining your federal taxable income. - Skipping to part 1 on the second page, follow the instructions to compute your total additions. Transfer the total from line 5 to line 3 on the first page. - Step 5 requires you to add lines 2 and 3 and enter the total on line 4. This number represents the total of your additions. - Moving to part 2 on the second page, follow the instructions to determine your total subtractions. Transfer the result from line 13 to line 5 on the first page. - To complete line 6, add lines 1 and 4, then subtract line 5 and line 2. If there is a difference, complete a separate form MD-NJD to complete line 7. - Skip to part 3 on the second page to compute your federal income tax, which should be entered there and on line 8 of the first page. - Follow the instructions on lines 9 through 13 to determine your state taxable income. - Step 10 involves calculating...