It depends.
If you're e-filing, you only need to mail copies of your Form 8949 along with Form 8453 if:
- You entered a summary for one or more sales categories instead of each individual sale; AND
- The sales category for one or more summaries is something other than Box A (short-term covered) or Box D (long-term covered); or
- The Box A and/or Box D summary includes adjustments (typically listed in boxes 1f or 1g on your broker statement).
Otherwise, if you entered each individual sale, or you entered summaries for Boxes A and/or D with no adjustments, do NOT mail in your Form 8949.
Here is a help article Do I need to fill out or mail in Form 8949?
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