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US income tax filing is an annual process in which individuals and businesses report their earnings to the federal government and calculate the taxes they owe. The system is administered by the Internal Revenue Service (IRS) and plays a major role in funding public services such as healthcare, education, infrastructure, and national defense. Understanding how income tax filing works can help taxpayers avoid penalties, claim available deductions, and manage their finances more effectively. This guide explains the basics of US income tax filing, including who must file, important forms, deductions, and filing methods. Understanding the US Income Tax System The United States uses a progressive income tax system , meaning taxpayers pay different tax rates based on their income level. Instead of applying one rate to all income, the government divides income into tax brackets. Each portion of income is taxed at a different rate depending on the bracket it falls into. Income that is usual...