1040 Instructions 2025 Schedule 1. Its primary function is to accommodate additional income streams and. Schedule 1 is a tax form that you need to attach to your federal tax return — irs form 1040 — if you have certain types of income or if you have certain expenses that the.
Schedules 1, 2, and 3 are supplemental documents that are part of a taxpayer’s income tax filing package, even if they aren’t filled out. April 15, 2025, marks the deadline for filing your form 1040 and paying any.