"Tax Day" refers to the deadline for individuals and businesses to file their annual income tax returns with the government. In the United States, this day typically falls on April 15, although it can be adjusted if it lands on a weekend or holiday. Taxpayers must report their earnings and calculate the taxes owed or any refund due to them. On Tax Day, many people gather their financial documents, such as W-2 forms and 1099 forms, to complete their tax returns. Filing can be done electronically or by mail, and it's important to meet the deadline to avoid penalties. Extensions may be available, but taxes owed are still due on Tax Day.