A tax return is a formal document that individuals and businesses submit to the government to report their income, expenses, and other financial information for a specific year. This document helps determine how much tax is owed or if a refund is due. Tax returns typically include various forms and schedules that detail different sources of income and deductions. Filing a tax return is usually required annually, and the deadline varies by country. In the United States, for example, most individuals must file by April 15. Accurate completion of a tax return is essential to avoid penalties and ensure compliance with tax laws.