Skip to main content

United States · Supreme Court

How promptly must I respond to a Supreme Court motion?

Supreme Court Rule 21.4 requires a response as promptly as possible considering the relief and any asserted emergency. Its ten-day period from receipt is an outer limit unless the Court, a Justice or the Clerk under Rule 30.4 orders otherwise. The Court may act without waiting for a response.

5.0Rated by lawyers in California, London and Singapore“The platform is really easy to use.” — Michael B., California“The Evidence Record saved us time with our insurance on bankruptcy matters.” — Maria, London, UK“The most up-to-date service we could find.” — Li Chen, Singapore
Read why no date is calculated
Period
As promptly as possible, in any event within ten days of receipt unless ordered otherwise
Trigger
Actual receipt of the motion, its asserted urgency and any operative response direction
Rule
Supreme Court Rule 21.4
Rules of the Supreme Court of the United States

Adopted February 17, 2026, effective March 16, 2026

Source guide · No automated date

Review urgency and the operative schedule

A ten-day result alone cannot establish promptness for the asserted relief or an actual response direction. This source guide supplies no computed date or paid calculation record.

Supreme Court Rule 21.4

What lawyers say

5.0
  • “The platform is really easy to use.”

    Michael B.Employment litigation attorney · California

  • “The Evidence Record saved us time with our insurance on bankruptcy matters.”

    MariaBankruptcy and commercial attorney · London, UK

  • “The most up-to-date service we could find.”

    Li ChenArbitration practitioner · Singapore

Which events must I establish?

Preserve when the responding party actually received the motion. Filing with the Court alone does not establish that receipt.

Read the relief sought and any asserted need for emergency action immediately.

Check for an actual Court or Justice direction, or a Clerk direction within Rule 30.4 authority.

Identify the motion’s form and whether time permits a corresponding response. Do not assume the Court will wait ten days.

Supreme Court Rule 21.4

Why is a single period insufficient?

  1. Record actual motion receipt.
  2. Review the asserted urgency and relief.
  3. Read any operative response direction.
  4. Treat ten days as the default outer limit, not a waiting allowance.
  5. File promptly and preserve separate service evidence.

Rule 30.1 governs computation of the default ten-day outer period from established receipt. That arithmetic does not determine the separate promptly-as-possible requirement or an actual replacement direction.

Rule 21.4 permits the Court or a Justice, or the Clerk under Rule 30.4, to order otherwise. A pending extension request does not change the operative schedule. In an appropriate case the Court may act without a response.

The default forward outer period uses Rule 30.1 final closed-day treatment. A final-day adjustment is not permission to delay a response that the nature of the relief or emergency requires sooner.

Supreme Court Rule 21.4

Why is no automated date shown?

The rule’s open-ended promptness duty cannot be derived from a single date. A numerical outer-limit example would not establish that the particular response is timely.

Which qualifications change the procedure?

Emergency and promptness
Consider the nature of the relief and any asserted emergency. The ten-day outer period does not remove the separate promptness duty.
Different direction
The Court or a Justice, or the Clerk under Rule 30.4, may order otherwise. Preserve the actual direction rather than inferring one from a request.
Response form
A response to a Rule 33.1 motion, except a response to a motion for leave to file an amicus brief, uses the same form if time permits. Check the actual motion and applicable submission requirements.
Court action before response
In an appropriate case the Court may act on the motion without waiting for a response. An unexpired outer period does not promise an opportunity to be heard first.
Supreme Court Rule 21.4
  • This source guide does not infer triggering facts, an extension or the effect of a particular direction.
  • It provides no computed date or paid calculation record.

What should I check before completing the act?

Common questions

The specific procedure

May I always wait ten days to respond?

No. Rule 21.4 separately requires a response as promptly as possible considering the relief and asserted emergency. Ten days is the default outer limit.

Supreme Court Rule 21.4

Does the motion’s Court filing start the response period?

Rule 21.4 uses receipt. Establish actual incoming receipt instead of substituting the motion’s filing or dispatch date.

Supreme Court Rule 21.4

Must the Court wait until the response period expires?

No. Rule 21.4 says the Court may act without waiting for a response in an appropriate case.

Supreme Court Rule 21.4

Must every response use the same form as the motion?

Rule 21.4 requires the corresponding Rule 33.1 form if time permits, with the stated exception for a response to a motion for leave to file an amicus brief. Check the specific motion.

Supreme Court Rule 21.4

Official sources and scope

Provisions used (10)
Provisions used in this guide
ProvisionPurpose
Supreme Court Rule 21.4The specific events, requirements and completion boundary
Supreme Court Rule 21.1–2The identified procedural qualification
Supreme Court Rule 21.2–3The identified procedural qualification
Supreme Court Rule 30.4The identified procedural qualification
Supreme Court Rule 30.1The identified procedural qualification
Supreme Court Rule 30Computation and authorized changes
Supreme Court Rule 29.1–3The identified procedural qualification
Supreme Court Rule 29.2–3The identified procedural qualification
Supreme Court Rule 29.7The identified procedural qualification
Electronic Filing Guidelines, March 2026Current electronic requirements, exceptions and separate service
Read the current Supreme Court rules

Cookie preferences

Deadline Engine uses necessary cookies for authentication and security. You can choose whether we may load Plausible Analytics to measure aggregate site use. We do not use advertising or marketing tracking. You can change this any time from the footer. Read the Cookie Policy.