Final answer:
Tax returns for individuals, estates, trusts, and partnerships are generally due on April 15, unless it's a weekend or holiday, then it's the next business day.
Step-by-step explanation:
The tax return due date for individuals, estates, trusts, and partnerships primarily falls on April 15 of each year. In cases where April 15th is a weekend or a legal holiday, the due date is extended to the next business day. It's important for taxpayers to adhere to this deadline to avoid any potential penalties and interest on any taxes owed.
Individual income tax is a significant aspect of federal government revenue despite being less than half of the total federal tax revenue.