The Form 1040 is the standard U.S. Individual Income Tax Return used to report annual income and calculate tax liability. You must file if your income exceeds certain thresholds, which for 2025 are:
- Single filers: $13,850
- Married filing jointly: $27,700
- Head of household: $20,800
Even if below these thresholds, file to receive refunds or credits. The form includes sections for reporting income, claiming deductions, and calculating taxes owed or refunds due.