Winning an appeal starts long before oral argument. It starts with the briefing schedule, and the briefing schedule in federal court runs on three numbers: 40, 30, and 21. Miss one of them and the appeal can be dismissed before a judge ever reads your argument. Federal Rule of Appellate Procedure 31 sets the whole sequence, and unlike the 30-day deadline for filing the notice of appeal, these deadlines can be extended — but only if you ask the right way, and only before the court loses patience.
This guide walks through the FRAP 31 schedule, how the days are actually counted, what changes when there is a cross-appeal, and what happens when a brief is late. If you are still at the stage of getting the appeal started, our federal appeal deadline guide covers the 30-day notice-of-appeal clock under FRAP 4 — that is the deadline that cannot be extended, and it comes first.
The 40/30/21 Schedule in FRAP 31(a)(1)
FRAP 31(a)(1) states the schedule in one sentence, and it is worth reading exactly as written:
| Brief | Due | Clock starts |
|---|---|---|
| Appellant’s opening brief | Within 40 days | After the record is filed |
| Appellee’s brief | Within 30 days | After the appellant’s brief is served |
| Appellant’s reply brief | Within 21 days | After the appellee’s brief is served |
Three details in that sentence catch people out. First, the appellant’s 40 days run from the filing of the record, not from the notice of appeal and not from the district court’s judgment. The record takes weeks to assemble after the appeal is docketed, so the briefing clock starts later than most new appellants expect — and then moves fast. Second, the appellee’s and reply clocks run from service of the other side’s brief, not from filing, so the date the other side actually serves the brief is the date that matters. Third, the reply brief is optional. The appellant may file one, but nothing requires it, and a reply that only repeats the opening brief wastes the court’s time and the client’s money.
The 21-day reply period is also the newest part of the rule. Before December 1, 2018, the reply was due within 14 days. The 2018 amendment stretched it to 21 days, in part because the rules now measure time periods in seven-day increments. Older guides, older local rules summaries, and older form orders still show 14 days. If a source you are reading says 14, it is out of date — trust the current rule text.
When the Clock Starts: “After the Record Is Filed”
The record is the district court record on appeal: the docket entries, the pleadings, the orders, the transcripts, and the exhibits, assembled under FRAP 10 and 11 and forwarded to the court of appeals. In practice, the circuit clerk sends a notice when the record is filed, and many circuits issue a briefing schedule by order at the same time. That order is the document to calendar, not the rule alone.
Two practical points follow. First, a transcript delay pushes the record back, and the briefing clock does not start until the record is actually filed — but do not assume a transcript problem buys you time. The court can set its own schedule, and FRAP 31(a)(2) lets a court of appeals that routinely decides cases promptly after briefing shorten the time by local rule or by order in a particular case. Second, check the circuit’s local rules before you rely on the 40/30/21 defaults. Several circuits run their own briefing schedules, and the clerk’s docketing notice in your case controls over any general summary, including this one.
Counting the Days Under FRAP 26(a)
Counting follows FRAP 26(a), the appellate twin of FRCP 6(a). Exclude the day that starts the period. Count every day after that, including Saturdays, Sundays, and legal holidays. If the last day lands on a Saturday, Sunday, or legal holiday, the deadline rolls to the next day that is not one of those.
One more counting rule matters here. Under FRAP 26(c), when a party must act within a set period after service, three calendar days are added if service was by mail, by delivery to the clerk, or by another consented means. Electronic service gets no extra days — that changed on December 1, 2016. Since nearly all appellate briefs are now served electronically, the three-day addition almost never applies to briefing deadlines, but it still shows up when a paper is served by mail.
Worked Example: A Full Briefing Calendar
Take a real calendar and run the whole sequence through it. The record is filed on Friday, November 13, 2026.
- Appellant’s opening brief: 40 days after November 13 is Wednesday, December 23, 2026. That is the first hard date on the calendar.
- Appellee’s brief: suppose the appellant serves the opening brief on Friday, November 20, 2026. Thirty days after that is Sunday, December 20, 2026, so the deadline rolls to Monday, December 21, 2026.
- Reply brief: suppose the appellee serves its brief on Friday, November 27, 2026. Twenty-one days after that is Friday, December 18, 2026.
- The argument floor: suppose instead the appellee serves its brief on Friday, December 18, 2026, and argument is set for Friday, January 15, 2027. Twenty-one days after December 18 is Friday, January 8, 2027 — exactly seven days before argument. The reply is timely, but by a single day. Serve it one day later and the 21-day rule is satisfied while the seven-day floor is not.
Run the same calendar through our legal deadline calculator as a cross-check, and confirm the result against the clerk’s briefing order. A calculator catches arithmetic slips; it does not know your circuit’s local schedule.
The Reply Brief’s Second Deadline: 7 Days Before Argument
The reply brief carries two deadlines at once. It is due within 21 days after service of the appellee’s brief, and it must be filed at least seven days before argument, unless the court, for good cause, allows a later filing. The earlier of the two controls. When argument is set close behind the appellee’s brief, the seven-day floor can cut the 21 days short — sometimes sharply.
This is the trap that bites appellants who treat the reply period as a fixed 21 days. If the court sets argument for two weeks after the appellee’s brief, your reply is not due in 21 days. It is due seven days before argument, which is about seven days after the appellee’s brief. Calendar both dates the day the appellee’s brief arrives, and file to the earlier one.
Cross-Appeals Run a Four-Brief Schedule (FRAP 28.1(f))
When both sides appeal, FRAP 31 steps aside and FRAP 28.1(f) sets a four-brief schedule. The appellee in the main appeal is also the cross-appellant, so the briefs do double duty:
| Brief | Due | Clock starts |
|---|---|---|
| Appellant’s principal brief | Within 40 days | After the record is filed |
| Appellee’s principal and response brief | Within 30 days | After the appellant’s principal brief is served |
| Appellant’s response and reply brief | Within 30 days | After the appellee’s principal and response brief is served |
| Appellee’s reply brief | Within 21 days | After the appellant’s response and reply brief is served |
The same seven-day-before-argument floor applies to the final reply. Run the chain on the same calendar: record filed Friday, November 13, 2026, so the principal brief is due Wednesday, December 23, 2026. If it is served that day, the appellee’s principal and response brief is due Friday, January 22, 2027. If that brief is served on January 22, the appellant’s response and reply brief is due Sunday, February 21, 2027, which rolls to Monday, February 22, 2027. And if that brief is served on February 22, the appellee’s reply brief is due Monday, March 15, 2027. Four briefs, four clocks, and each one starts from service of the brief before it — so a one-day slip early in the chain moves every date after it.
Extensions: FRAP 26(b) Allows Them, but Ask Early
Brief deadlines are extendable, and that is the sharp contrast with the notice of appeal. Under FRAP 26(b), the court may extend the time prescribed by the rules, or permit an act after the time expires, for good cause. The request must be made by motion under FRAP 27, with proof of service on all parties. The one thing FRAP 26(b) will never do is extend the time to file a notice of appeal (except as FRAP 4 allows) or a petition for permission to appeal.
That contrast is worth holding onto. The notice of appeal is jurisdictional and essentially unforgiving — see our federal appeal deadline guide and our FRAP 4(a)(5) and 4(a)(6) extension guide for the narrow exceptions. A brief deadline is a case-management deadline, and courts routinely grant a first extension for good cause: a record that arrived late, a transcript correction, counsel’s illness, a genuinely complex record. What courts do not grant is a pattern. Second and third extensions get shorter, harder, and sometimes conditioned on no further extensions. File the motion before the deadline expires, say exactly why the extra time is needed, and ask for a specific number of days.
Note the difference from district court practice. In the district court, FRCP 6(b) draws a line between extensions before expiry (good cause) and after expiry (excusable neglect), and it bars extensions entirely for seven post-judgment deadlines. Our FRCP 6(b) extension guide explains that framework. On appeal, FRAP 26(b) uses a single good-cause standard and even allows an act after the time expires — but “after the time expires” is a request for forgiveness, not a right, and it works best when the delay is short and the explanation is honest.
What Happens If You Miss a Brief Deadline
FRAP 31(c) states the consequence plainly: if an appellant fails to file a brief within the time provided by the rule, or within an extended time, an appellee may move to dismiss the appeal. The court can also dismiss on its own, and many circuits issue a warning order first, giving the appellant a short window — often 14 days — to file the brief or show cause why the appeal should not be dismissed.
Dismissal is not the only risk. A late appellee’s brief can be struck, leaving the appellee unable to argue at all. A late reply brief can be refused, which matters most when the appellee raised a new argument that only the reply could answer. And even when the court forgives the delay, the damage is practical: a rushed brief is a worse brief, and a court that has already had to chase your filing reads the next one with less patience.
Local rules add their own teeth. Some circuits treat a missed briefing deadline as a failure to prosecute and dismiss without a separate motion. Others set their own default briefing schedules by order, so the deadline that controls your case may be shorter than the rule’s 40/30/21. Read the docketing notice the day it arrives, calendar every date in it, and set a reminder a week before each one.
Five Mistakes That Cost Appellants Their Briefs
First, counting from the notice of appeal instead of the record. The 40 days start when the record is filed, and the record is filed weeks after the notice. Appellants who count from the notice either panic early or, worse, assume they have more time than they do once the record actually lands.
Second, trusting an outdated 14-day reply period. Any guide, memo, or form written before December 2018 says 14 days. The current rule says 21. Check the date on anything you rely on.
Third, forgetting the seven-day argument floor. A reply filed within 21 days can still be late if argument is less than seven days away. Calendar the argument date next to the reply date, every time.
Fourth, assuming the three-day mail rule still applies. It does not apply to electronic service, and electronic service is now the norm. Adding three phantom days to a briefing deadline is how a brief becomes three days late.
Fifth, treating an extension as automatic. Extensions require a motion, a reason, and usually the other side’s position. A phone call to the clerk is not a motion, and an unopposed request filed after the deadline has passed is a much weaker ask than the same request filed a week early.
Frequently Asked Questions
How long does the appellant have to file the opening brief?
Forty days after the record is filed, under FRAP 31(a)(1). The clock does not start with the notice of appeal or the judgment — it starts when the record is filed in the court of appeals, which the clerk will confirm by notice. Check the circuit’s local rules and the briefing order in your case, because a court can shorten the period by local rule or by order.
How long does the appellee have to respond?
Thirty days after the appellant’s brief is served. The clock runs from service, not from the date the appellant filed the brief with the clerk, so the service date on the certificate of service is the date to calendar. In a cross-appeal the appellee’s combined principal and response brief follows the same 30-day rule under FRAP 28.1(f)(2).
How long do I have to file a reply brief?
Twenty-one days after service of the appellee’s brief, and in any event at least seven days before oral argument unless the court, for good cause, allows a later filing. The earlier of the two dates controls. The reply is optional, and it should answer the appellee’s arguments rather than repeat the opening brief.
Can a briefing deadline be extended?
Yes. Under FRAP 26(b), the court may extend a briefing deadline for good cause, or permit a late filing after the deadline, on a motion under FRAP 27 with proof of service. First extensions are routinely granted for a real reason. What the court cannot extend is the time to file the notice of appeal or a petition for permission to appeal — those deadlines are fixed by FRAP 4 and FRAP 5, and our FRAP 5 permission-to-appeal guide explains the 10-day jurisdictional period for interlocutory appeals.
What happens if the appellant files no brief at all?
Under FRAP 31(c), the appellee may move to dismiss the appeal, and the court may dismiss it on its own. Many circuits first issue a warning order giving the appellant a short period to file or show cause. A dismissed appeal for failure to brief is a dismissal for failure to prosecute, and it ends the appeal without any decision on the merits.
Do the 40/30/21 deadlines apply in a cross-appeal?
Not exactly. FRAP 28.1(f) replaces them with a four-brief schedule: appellant’s principal brief within 40 days after the record is filed, appellee’s principal and response brief within 30 days after that, appellant’s response and reply brief within 30 days after that, and appellee’s reply brief within 21 days after that, subject to the same seven-day-before-argument floor. After the appeal ends, the clock for a further petition is a different one — our FRAP 40 rehearing guide covers the 14-day petition for rehearing.
This article is general information about federal appellate procedure, not legal advice. Briefing schedules vary by circuit and by court order, and the clerk’s docketing notice in your case controls. Confirm every deadline against the current rule text and the order in your case, and consult a licensed attorney before relying on any deadline stated here.