Line 21

You have a capital loss carryover from 2025 to 2026 if you have a loss on line 16 and either:

That loss is more than the loss on line 21; or

The amount on Form 1040, 1040-SR, or 1040-NR, line 15, would be less than zero if you could enter a negative amount on that line.

To figure any capital loss carryover to 2026, you will use the Capital Loss Carryover Worksheet in the 2026 Instructions for Schedule D. If you want to figure your carryover to 2026 now, see Pub. 550.

You will need a copy of your 2025 Form 1040 or 1040-SR and Schedule D to figure your capital loss carryover to 2026.