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No. 10599289
United States Court of Appeals for the Ninth Circuit
Mooney v. Roller Bearing Company of America Inc
No. 10599289 · Decided June 5, 2025
No. 10599289·Ninth Circuit · 2025·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
June 5, 2025
Citation
No. 10599289
Disposition
See opinion text.
Full Opinion
FOR PUBLICATION
UNITED STATES COURT OF APPEALS
FOR THE NINTH CIRCUIT
RICHARD MOONEY, Nos. 23-3552
23-3683
Plaintiff – Appellee /
D.C. No.
Cross-Appellant,
2:20-cv-01030-
LK
v.
ROLLER BEARING COMPANY
OF AMERICA INC, a Delaware OPINION
corporation,
Defendant – Appellant /
Cross-Appellee.
Appeal from the United States District Court
for the Western District of Washington
Lauren J. King, District Judge, Presiding
Argued and Submitted February 14, 2025
Seattle, Washington
Filed June 5, 2025
Before: William A. Fletcher, Ronald M. Gould, and
Jacqueline H. Nguyen, Circuit Judges.
2 MOONEY V. ROLLER BEARING CO. OF AMERICA
SUMMARY*
Prejudgment Interest
The panel affirmed the district court’s application of a
fluctuating federal rate in calculating prejudgment interest in
a case in which Richard Mooney, who prevailed at trial on
his claims under the federal Family and Medical Leave Act
and the Washington Family and Medical Leave Act,
received an award of compensatory damages against his
former employer Roller Bearing Company of America
(RBC).
The panel held that when a judgment is based on both
state and federal claims, without any distinction between the
claims, the district court has discretion to select a proper
prejudgment interest rate. Here, the district court properly
exercised its discretion in applying a fluctuating federal rate,
as it found that rate was the most accurate way to compensate
Mooney for the lost use of his wages between his first lost
paycheck and the jury’s verdict. Further, while Mooney
chose to file in state court, he did not contest RBC’s removal
to federal court. More significantly, the district court found
that Mooney asserted—and prevailed on—a federal claim
that largely guided Mooney’s litigation strategy.
*
This summary constitutes no part of the opinion of the court. It has
been prepared by court staff for the convenience of the reader.
MOONEY V. ROLLER BEARING CO. OF AMERICA 3
COUNSEL
Mark B. Middaugh (argued), Middaugh Law PLLC, Seattle,
Washington; Patrick J. Kang, Premier Law Group PLLC,
Bellevue, Washington; for Plaintiff-Appellee.
John J. White Jr. (argued) and Kevin B. Hansen, Peterson
Russell Kelly Livengood PLLC, Bellevue, Washington;
Blake Marks-Dias and Taryn M. Basauri, Corr Cronin LLP,
Seattle, Washington; for Defendant-Appellant.
OPINION
PER CURIAM:
Following a jury trial, Plaintiff Richard Mooney
(“Mooney”) received an award of compensatory damages
for his state and federal claims, without any distinction
between the claims. The district court, which had both
federal question and diversity jurisdiction, calculated
prejudgment interest based on a fluctuating federal rate.
Mooney appeals, arguing that the higher state rate should
have applied. We hold that when, as here, the judgment is
based equally on federal and state claims, the district court
has discretion to decide which rate applies. Because the
district court did not err in applying the federal rate, we
affirm.
I.
Mooney sued his former employer, Defendant Roller
Bearing Company of America (“RBC”), alleging violations
4 MOONEY V. ROLLER BEARING CO. OF AMERICA
of the Family and Medical Leave Act (“FMLA”) and the
Washington Family and Medical Leave Act (“WFMLA”).1
Mooney’s lawsuit arose out of his termination, which he
claimed was due to his age, depression, and his decision to
take leave under the FMLA. RBC contended that Mooney’s
termination was due to a reduction in force in response to the
COVID-19 pandemic. On June 3, 2020, Mooney filed suit
in King County Superior Court. On July 1, 2022, RBC filed
an uncontested motion to remove the case to federal court
under both federal question and diversity jurisdiction.
At trial, the jury was provided with nearly identical
instructions for both the FMLA and WFMLA claims, and
the verdict form combined both claims without distinction.2
The jury found RBC liable for these claims and awarded
Mooney $160,000 in damages. The parties disputed which
rate should apply to the calculation of prejudgment interest.
The district court concluded that it had discretion to select
the appropriate rate and chose to apply a fluctuating federal
rate. Both parties appeal.3
1
The complaint alleged other claims that the jury rejected.
2
The verdict form asked the jury whether Mooney “proved by
preponderance of the evidence that him extending his medical leave
under WFMLA and/or FMLA was a negative factor in RBC’s decision
to lay him off?”
3
RBC appeals the district court’s denial of its motion for a new trial.
Mooney cross-appeals, challenging the application of the federal rate to
any awarded prejudgment interest and the district court’s decision to
reduce his attorneys’ fees. This opinion addresses only Mooney’s
challenge to the prejudgment interest rate. We address the remaining
issues in a concurrently filed memorandum disposition.
MOONEY V. ROLLER BEARING CO. OF AMERICA 5
II.
We have jurisdiction pursuant to 28 U.S.C. § 1291. We
“review de novo whether state or federal law applies to
determine the amount and availability of prejudgment
interest.” Oak Harbor Freight Lines, Inc. v. Sears Roebuck,
& Co., 513 F.3d 949, 954 (9th Cir. 2008).
III.
A.
When a judgment is based on federal claims, the federal
rate generally applies to an award of prejudgment interest.
See id. at 961 (“[F]ederal law may apply to the calculation
of prejudgment interest when a substantive claim derives
from federal law alone.”). When a party prevails only on
state claims, the state interest rate generally applies. See,
e.g., In re Exxon Valdez, 484 F.3d 1098, 1102 (9th Cir.
2007) (reversing a district court’s application of the federal
rate to prejudgment interest as the plaintiff’s “substantive
claim arose under Alaska state law only,” so his “claim for
prejudgment interest arises out of, and must be analyzed
under, state law as well”).
We have not, however, addressed which rate should
apply when the judgment is based on both state and federal
claims without any distinction between them. In this
scenario, district courts in our circuit have adopted different
approaches. Some district courts have “blended” or
averaged state and federal rates. See, e.g., Jadwin v. Cnty.
of Kern, 767 F. Supp. 2d 1069, 1095–96 (E.D. Cal. 2011)
(averaging rates “[t]o properly compensate Plaintiff and to
account for the possibility that the jury returned a verdict
supported only by [federal] or [state law]”). Others have
applied federal law. See, e.g., Arnold v. Pfizer Inc., No. 10-
6 MOONEY V. ROLLER BEARING CO. OF AMERICA
CV-01025, 2015 WL 1262775, at *3 (D. Or. Mar. 18, 2015)
(“[I]n the absence of substantial evidence demonstrating that
a rate other than 28 U.S.C. § 1961 should apply, the court
awards prejudgment interest at the federal rate.”); Erhart v.
BofI Holding, Inc., No. 15-CV-02287, 2023 WL 6382479, at
*6 (S.D. Cal. Sept. 28, 2023).4
B.
As a general matter, “[i]n the absence of a controlling
statute, the choice of a rate at which to set the amount of
prejudgment interest is also within the discretion of a federal
court.” In re Int’l Admin. Servs., Inc., 408 F.3d 689, 710
(11th Cir. 2005); see also In re ClassicStar Mare Lease
Litig., 727 F.3d 473, 497 (6th Cir. 2013) (“[T]he method for
calculating prejudgment interest remains in the discretion of
the district courts.”). We see no reason to depart from this
general rule. We therefore hold that when a judgment is
based equally on both state and federal claims, the district
court has discretion to select a proper prejudgment interest
rate.
Prejudgment interest is designed to provide fair
compensation to a prevailing party. See, e.g., W. Pac.
Fisheries, Inc. v. SS President Grant, 730 F.2d 1280, 1289
4
Two of our sister circuits have addressed this question, albeit with little
or no analysis. In the First Circuit, “a plaintiff is entitled to select the
body of law under which the damages will be paid” when the “claims
under federal and state law . . . are identical” and the verdict is “not
segregated into separate federal and state components.” Doty v. Sewall,
908 F.2d 1053, 1063 (1st Cir. 1990); see also Foley v. City of Lowell,
Mass., 948 F.2d 10, 17 (1st Cir. 1991). In the Second Circuit, however,
“judgments that are based on both state and federal law with respect to
which no distinction is drawn shall have applicable interest calculated at
the federal interest rate.” Thomas v. iStar Financial, Inc., 629 F.3d 276,
280 (2d Cir. 2010).
MOONEY V. ROLLER BEARING CO. OF AMERICA 7
(9th Cir. 1984) (fixing “the rate for pre-judgment interest” to
the “measure of interest rates prescribed for post-judgment
interest in 28 U.S.C. § 1961(a) . . . unless the trial judge
finds, on substantial evidence, that the equities of the
particular case require a different rate.” (emphasis added));
see also Dishman v. UNUM Life Ins. Co. of Am., 269 F.3d
974, 988 (9th Cir. 2001) (“Prejudgment interest is an
element of compensation, not a penalty.”). This
determination is necessarily fact-intensive, and the district
court may base its decision on, among other relevant
considerations, the nature of the case, the plaintiff’s choice
of forum, whether the plaintiff primarily relied on federal or
state law for their substantive claims, and the impact of the
rate on the award. See, e.g., Arnold, 2015 WL 1262775, at
*3 (reasoning that a higher state rate could be justified if a
plaintiff’s claims “c[a]me to [federal] court by removal from
state court or because there is diversity of citizenship
between the parties”).
Here, the district court properly exercised its discretion
in applying a fluctuating federal rate, as it found that rate was
the “most accurate way to compensate Mooney for the lost
use of his wages between his first lost paycheck and the
jury’s verdict.” Mooney v. Roller Bearing Co. of Am., Inc.,
No. 20-CV-01030, 2023 WL 6979640, at *5 (W.D. Wash.
Oct. 23, 2023).5 Further, while Mooney chose to file in state
court, he did not contest RBC’s removal to federal court.
More significantly, the district court found that Mooney
“asserted—and prevailed on—a federal claim” that largely
guided Mooney’s litigation strategy. Id. For instance,
Mooney primarily cited federal caselaw to support his
5
Mooney’s expert, while calculating the prejudgment interest at the state
rate, also applied a fluctuating rate. Mooney, 2023 WL 6979640, at *5.
8 MOONEY V. ROLLER BEARING CO. OF AMERICA
WFMLA argument in his trial brief and to support his
WFMLA jury instruction, which is nearly identical to his
FMLA jury instruction. Id. Mooney also collapsed the state
and federal claims together. He proposed the verdict form’s
language, adopted by the district court, which did not
differentiate between his WFMLA and FMLA claims.
AFFIRMED.
Plain English Summary
FOR PUBLICATION UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT RICHARD MOONEY, Nos.
Key Points
01FOR PUBLICATION UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT RICHARD MOONEY, Nos.
02ROLLER BEARING COMPANY OF AMERICA INC, a Delaware OPINION corporation, Defendant – Appellant / Cross-Appellee.
03King, District Judge, Presiding Argued and Submitted February 14, 2025 Seattle, Washington Filed June 5, 2025 Before: William A.
04OF AMERICA SUMMARY* Prejudgment Interest The panel affirmed the district court’s application of a fluctuating federal rate in calculating prejudgment interest in a case in which Richard Mooney, who prevailed at trial on his claims under the
Frequently Asked Questions
FOR PUBLICATION UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT RICHARD MOONEY, Nos.
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This case was decided on June 5, 2025.
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