What tax form is commonly used by individuals to report their personal income tax?

The correct choice is Form 1040, which is the standard tax form used by individuals to report their personal income to the Internal Revenue Service (IRS) in the United States. This form allows taxpayers to calculate their taxable income, claim deductions and credits, and determine their tax liabilities. Form 1040 is essential for individuals to report various types of income, including wages, salaries, dividends, interest, and other sources, ensuring compliance with tax laws.

Form 1120 is primarily used by corporations to report their income, expenses, and taxes owed, making it unsuitable for individual taxpayers. Form 1065 is designated for partnerships to report their income, deductions, and credits, which do not apply to individual tax situations. Form 990 is intended for tax-exempt organizations to provide detailed financial information and is not relevant to personal income tax reporting. Thus, Form 1040 is uniquely positioned as the central form for individual income tax submissions.