Rule 8.Reply Brief

Last verified June 30, 2026

In one sentenceSupplemental Social Security Rule 8 allows the plaintiff to file and serve a reply brief within 14 days after the Commissioner’s brief, completing the briefing on which the court decides the Social Security review action.

Full Text of Rule 8

Text size

The plaintiff may file a reply brief and serve it on the Commissioner within 14 days after service of the Commissioner's brief.

End

Amendment History

(Added Apr. 11, 2022, eff. Dec. 1, 2022.)

Plain-English Summary

The last word belongs to the plaintiff. Supplemental Rule 8 permits the plaintiff to file and serve a reply brief, responding to the Commissioner’s arguments, within 14 days after the Commissioner’s brief is filed. A reply is optional, but when filed it closes the briefing.

Once the briefs are in, the case is ready for decision on the record under Supplemental Rule 5 — no trial, no live testimony, just the administrative record and the parties’ written arguments. Together, Rules 5 through 8 give Social Security review cases a clean, uniform path from filing to decision.

Frequently Asked Questions

Can the plaintiff file a reply brief?

Yes. Supplemental Rule 8 allows a reply brief, filed and served within 14 days after the Commissioner’s brief.

Is a reply brief required?

No, it's optional. But once the reply period passes (or a reply is filed), briefing is closed and the case is ready for decision on the record under Supplemental Rule 5.

Source & verification. The rule text and amendment history are reproduced verbatim from the official Federal Rules of Civil Procedure (Supplemental Social Security Rule 8), a public-domain work of the U.S. Government. Prescribed by the United States Supreme Court under the Rules Enabling Act. The plain-English summary is original and written by us. Last verified June 30, 2026. · Official source

Also known as: FRCP Supplemental Social Security Rule 8reply brief Social Security14 days reply