Recent updates to the Form 1040 include a correction to the 2024 Schedule 2, line 21. The revised instruction now reads: "Add lines 4, 7 through 16, 18, and 19. These are your total other taxes.

You can think of the 1040 like a math worksheet: You plug in various numbers from a schedule (Form 1040 will tell you which one to use) and add the schedules' totals to your Form 1040. Form 1040 packs ...