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The 2016 Form 1120, or the U.S. Corporation Income Tax Return, is used by corporations to report their income, gains, losses, deductions, credits, and to determine their income tax liability to the IRS. Corporations organized in the United States file this form annually. It is crucial for any U.S. corporation's compliance with federal tax regulations, providing a detailed account of financial activity.
Completing the Form 1120 involves several distinct steps:
Gather Required Information: Before starting, ensure you have the corporation's financial statements, including balance sheets and income statements.
Complete Basic Information: Fill out the corporation’s name, address, and Employer Identification Number (EIN) at the top of the form.
Calculate Gross Income: Enter the total income, which includes all sales, services, and other income sources.
Report Deductions: Document all deductible expenses, such as salaries, rent, and cost of goods sold, on the appropriate sections of the form.
Determine Taxable Income: Subtract deductions from the gross income to calculate taxable income.
Compute Tax Liability: Utilize the current tax rates to determine the corporation's tax obligations.
Attach Required Schedules and Statements: Include necessary schedules, such as Schedule C for dividends or Schedule J for income tax computation.
Sign and File the Form: Review the entire form for accuracy, sign it, and submit it by the due date.
Typically, Form 1120 is due by the 15th day of the fourth month after the end of the corporation’s tax year. For calendar year taxpayers, this means April 15, 2017, is the due date for the 2016 Form 1120. Extensions may be requested using Form 7004, allowing an additional six months to file.
The Form 1120 is primarily used by:


The IRS provides comprehensive instructions for completing Form 1120. These guidelines include explanations of income categories, deductible expenses, and required documentation for specific deductions or credits. The IRS may also revise these instructions based on changes to tax laws, emphasizing the need to review them carefully each filing year.
Corporations failing to file Form 1120 by the due date without a valid extension face penalties. The penalty is generally 5% of the unpaid tax for each month the return is late, up to a maximum of 25%. Additionally, underpayment of taxes can result in separate penalties and interest on the outstanding amount.
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