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.

This form is an itemized, line-by-line description of all ... be entered on the electronically filed Form 1040-X. The IRS says it can take up to 16 weeks to process an amended return.

If you have any balance due on Line 37 of your Form 1040 or 1040-NR, you need to fill out Form 1040-V if you're mailing your payment. You can also pay electronically and avoid filling out this form.