A bench trial ends and the judge issues findings of fact and conclusions of law. You read them and spot a problem: the court found the delivery date was March 3, but the uncontradicted testimony put it on March 13, and that ten-day gap decides the case. You have two options. You can live with the finding and argue clear error on appeal, or you can ask the trial judge to fix it first. Rule 52(b) is the tool for the second option, and it comes with a hard 28-day clock.
Federal Rule of Civil Procedure 52(b) says that on a party’s motion filed no later than 28 days after the entry of judgment, the court may amend its findings, or make additional findings, and may amend the judgment accordingly. The motion may accompany a motion for a new trial under Rule 59. That is the whole rule, and every word in it matters: the motion must be filed, not merely served, within 28 days, and the clock runs from the entry of judgment, not from when you receive the findings.
What Rule 52(a) Requires Before Rule 52(b) Can Help
Rule 52(b) only makes sense in a case tried to the court. Under Rule 52(a)(1), in an action tried on the facts without a jury, or with an advisory jury, the court must find the facts specially and state its conclusions of law separately, and judgment is entered under Rule 58. The same duty applies when a court grants or refuses an interlocutory injunction. Findings are unnecessary on decisions of motions under Rules 12 or 56, or on any other motion, except as Rule 52(c) provides for judgment on partial findings.
That split is the reason Rule 52(b) exists at all. A jury returns a verdict; a judge in a bench trial writes findings. When the written findings misstate the evidence, leave out a fact the judgment depends on, or draw a conclusion the findings do not support, Rule 52(b) lets the same judge correct the record while the case is still in the trial court. The motion is aimed at the findings themselves, not at the judgment as an abstract matter. If the judgment is wrong because the law is wrong, the right vehicle is usually a Rule 59(e) motion to alter or amend the judgment, covered in our federal post-judgment motion deadline guide.
One more feature of Rule 52(a) shapes everything that follows. Under Rule 52(a)(6), findings of fact, whether based on oral or other evidence, must not be set aside unless clearly erroneous, and the reviewing court must give due regard to the trial court’s opportunity to judge the witnesses’ credibility. The Supreme Court put the test this way in Anderson v. City of Bessemer City, 470 U.S. 564 (1985): a finding is clearly erroneous when, although there is evidence to support it, the reviewing court on the entire evidence is left with a definite and firm conviction that a mistake has been committed. If the district court’s account of the evidence is plausible in light of the record viewed in its entirety, the court of appeals may not reverse it even though convinced that, had it been sitting as the trier of fact, it would have weighed the evidence differently. Conclusions of law, by contrast, are reviewed de novo. That deference is exactly why a Rule 52(b) motion is worth filing: persuading the trial judge to correct a finding is far easier than persuading an appellate court that the finding was clearly erroneous.
The 28-Day Deadline and How to Count It
The deadline is 28 days after the entry of judgment. Entry means the judgment is entered on the docket under Rule 58, which is the same event that starts the 30-day appeal clock under Federal Rule of Appellate Procedure 4(a)(1)(A). Counting follows Rule 6(a): exclude the day of the event that triggers the period, count every day including weekends and holidays, and if the last day is a Saturday, Sunday, or legal holiday, the period runs until the end of the next day that is not one of those days.
Three worked examples, all counted that way:
Judgment entered Monday, November 2, 2026. Day 1 is Tuesday, November 3. Day 28 is Monday, November 30, 2026. The Rule 52(b) motion must be filed by November 30.
Judgment entered Friday, November 6, 2026. Day 28 is Friday, December 4, 2026. The motion must be filed by December 4.
Judgment entered Friday, December 4, 2026. Day 28 lands on Friday, January 1, 2027, which is New Year’s Day, a federal legal holiday. Under Rule 6(a)(3) the deadline rolls to the next day that is not a Saturday, Sunday, or legal holiday: Monday, January 4, 2027.
The 28-day period is a modern one. Before the December 1, 2009 amendment, Rule 52(b) allowed only 10 days. The amendment stretched it to 28 days so that it lines up with the 28-day periods in Rules 50(b), 59(b), and 59(e), and so a litigant deciding whether to file post-judgment motions has the same window for all of them. In bankruptcy adversary proceedings the clock is shorter: Bankruptcy Rule 7052 cuts the Rule 52(b) period to 14 days after entry of judgment.
The Appeal Clock: A Timely Rule 52(b) Motion Tolls FRAP 4
The most valuable feature of a Rule 52(b) motion is what it does to the appeal deadline. Under Federal Rule of Appellate Procedure 4(a)(4)(A)(ii), if a party timely files a motion to amend or make additional factual findings under Rule 52(b), whether or not granting the motion would alter the judgment, the time to file an appeal runs for all parties from the entry of the order disposing of the last such remaining motion. The 30-day civil appeal clock does not start until the district court rules.
Take a concrete case. Judgment is entered Friday, November 13, 2026. Without any post-judgment motion, the notice of appeal is due 30 days later, and because day 30 is Sunday, December 13, it rolls to Monday, December 14, 2026. But suppose the losing party files a timely Rule 52(b) motion on Friday, December 11, 2026, day 28. The appeal clock stops. If the court denies the motion by order entered Monday, January 4, 2027, the new appeal deadline is 30 days after that order: Wednesday, February 3, 2027. Our federal notice of appeal deadline guide walks through the base 30-day rule and the 60-day rule when the United States is a party.
Two cautions. First, only a timely motion tolls. A Rule 52(b) motion filed on day 29 does not stop the appeal clock, and a notice of appeal filed within 30 days of the denial of an untimely motion is still late. Second, if a notice of appeal is filed before the court disposes of a timely Rule 52(b) motion, the notice becomes effective when the order disposing of the motion is entered, under FRAP 4(a)(4)(B)(i). But a party that wants to challenge the order disposing of the motion, or a judgment altered by it, must file a new or amended notice of appeal within the time measured from that order, under FRAP 4(a)(4)(B)(ii). Filing early and forgetting the amended notice is a classic way to lose an appeal.
Rule 52(b) Versus Rule 59(e): Pick the Motion That Fits the Error
Rule 52(b) and Rule 59(e) share the same 28-day deadline and both toll the appeal clock, so litigants often file them together. Rule 52(b) expressly allows the combination: the motion may accompany a motion for a new trial under Rule 59. But the two motions do different jobs, and the label on the filing is not what controls.
A Rule 52(b) motion asks the court to change its findings of fact or add findings it omitted, and to amend the judgment to match. A Rule 59(e) motion asks the court to alter or amend the judgment itself, typically because of a manifest error of law or fact, newly discovered evidence, or an intervening change in controlling law. When the problem is a factual finding that the record does not support, Rule 52(b) is the direct route. When the problem is that the court applied the wrong legal standard to facts nobody disputes, Rule 59(e) is the better fit. Filing both, with each one aimed at its own target, is common and safe.
What is not safe is filing a motion that calls itself a Rule 52(b) or Rule 59(e) motion but does none of the work of one. Courts look at substance over form. The Ninth Circuit made the point in U.S. ex rel. Hoggett v. University of Phoenix, 863 F.3d 1105 (9th Cir. 2017), dismissing an appeal where a motion labeled as a Rule 59(e) motion was in substance only a request to stay entry of judgment and did not actually seek to alter or amend anything. The same logic applies to a Rule 52(b) motion that asks for no amended or additional finding. A tolling motion has to do the job its name promises, or it may not toll.
The Court Cannot Extend the 28 Days
There is no safety valve on this deadline. Rule 6(b)(2) provides that a court must not extend the time to act under Rules 50(b) and (d), 52(b), 59(b), (d), and (e), and 60(b). Good cause does not help, and excusable neglect does not help. The 28 days are jurisdictional in effect, because the appeal clock and the tolling rules all key off them. Our federal extension of time deadline guide explains the full Rule 6(b) framework, including the two standards that do work for extendable deadlines and the seven rules that can never be extended.
Note what Rule 6(b)(2) does not cover. Rule 6(d) still adds three days when a party must act within a specified time after being served by mail, by the clerk, or by other means consented to in writing, but that extension applies to service-based deadlines, not to the Rule 52(b) period, which runs from entry of judgment. And electronic service gets no extra three days at all since the December 1, 2016 amendment.
Five Mistakes That Waste a Rule 52(b) Motion
Filing it after a jury trial. Rule 52(b) is a bench-trial device. A jury’s verdict is attacked with a renewed motion for judgment as a matter of law under Rule 50(b) or a motion for a new trial under Rule 59, not with a motion to amend findings that were never made. Our federal judgment as a matter of law deadline guide covers the Rule 50(b) route.
Counting from the wrong event. The clock runs from entry of judgment, not from the date the court announced its decision, not from the date you received the findings, and not from the date the findings were filed if judgment was entered later. Check the docket entry for the judgment itself.
Serving but not filing. Rule 52(b) requires the motion to be filed no later than 28 days after entry of judgment. A motion served on day 28 but filed on day 29 is late.
Assuming the motion is required before appealing. It is not. A party may question the sufficiency of the evidence supporting the findings on appeal whether or not the party objected to the findings, moved to amend them, or moved for partial findings. Rule 52(b) is an opportunity, not a prerequisite. But skipping it means arguing clear error on appeal, which is a much harder standard than persuading the trial judge.
Treating a motion to reconsider as a Rule 52(b) motion. There is no freestanding motion to reconsider in the Federal Rules. A paper that asks the court to rethink its decision without identifying findings to amend or add may be recharacterized as a Rule 59(e) motion, or it may toll nothing at all. Name the findings, quote them, point to the record, and say what the amended finding should be.
Frequently Asked Questions
How many days do I have to file a Rule 52(b) motion?
28 days after the entry of judgment. The motion must be filed, not merely served, within that period. Count under Rule 6(a): exclude the day judgment was entered, count every day including weekends, and roll forward if day 28 falls on a Saturday, Sunday, or legal holiday.
Does a Rule 52(b) motion extend the deadline to appeal?
Yes, if it is timely. Under FRAP 4(a)(4)(A)(ii), a timely Rule 52(b) motion tolls the appeal clock for all parties, and the 30-day period to file a notice of appeal runs from the entry of the order disposing of the last remaining tolling motion. An untimely motion does not toll.
Can the court extend the 28-day Rule 52(b) deadline?
No. Rule 6(b)(2) expressly forbids the court from extending the time to act under Rule 52(b), along with Rules 50(b) and (d), 59(b), (d), and (e), and 60(b). Neither good cause nor excusable neglect can save a late filing.
Can I file a Rule 52(b) motion after a jury trial?
No. Rule 52(b) applies to findings made by the court in a bench trial, or with an advisory jury. After a jury trial, the verdict is challenged under Rule 50(b) or Rule 59, not Rule 52(b).
Do I have to file a Rule 52(b) motion before I can appeal?
No. The motion is optional. You can challenge the sufficiency of the evidence supporting the findings on appeal without ever filing one. The trade-off is the standard of review: on appeal, findings stand unless clearly erroneous, while a Rule 52(b) motion asks the trial judge to fix the finding directly.
What is the Rule 52(b) deadline in bankruptcy court?
14 days after entry of judgment. Bankruptcy Rule 7052 applies Rule 52 in adversary proceedings but shortens the Rule 52(b) motion period from 28 days to 14 days, because the bankruptcy appeal deadline is 14 days rather than 30.
This article is general information about federal court deadlines, not legal advice. Court rules change, local rules add requirements, and the facts of a case can change which rule applies. Confirm the deadline against the current text of the rules and, when the stakes are high, check it with a licensed attorney before relying on it. If you think a deadline has already passed, read our guide on what happens after a missed court deadline and act immediately.