Silence Isn’t Golden: Waiver of the Right to Compel Arbitration When Setting-Aside a Default — Commentary on Monarch Heating & Cooling, LLC v. Petra, Inc.

I. Introduction

The Supreme Court of Montana’s decision in Monarch Heating & Cooling, LLC v. Petra, Inc., 2025 MT 184, is far more than a routine construction-contract spat. It addresses when — and how — a litigant loses the contractual right to compel arbitration after litigation has already begun. Petra, a general contractor, sought to force its HVAC subcontractor Monarch into arbitration several months after a default had been set aside and substantive pleadings exchanged. The District Court, and now the Supreme Court, found the request untimely and prejudicial, holding that Petra waived the arbitral right by its own litigation conduct and, critically, by remaining silent about arbitration while persuading Monarch to stipulate away a default judgment.

Because waiver of arbitration is regularly litigated in Montana’s state courts — especially in construction, employment, and consumer finance cases — the ruling will reverberate well beyond this specific dispute. It clarifies the Montana Downey three-part waiver test, harmonises it with recent U.S. Supreme Court authority (Morgan v. Sundance, Inc.), and, most notably, creates a concrete trigger point: a party that asks the court (and opposing party) to set aside a default without simultaneously raising arbitration risks permanently forfeiting that right.

II. Summary of the Judgment

The Court (Justice Shea, writing for the majority; Chief Justice Swanson dissenting) affirmed the District Court’s denial of Petra’s motion to stay proceedings and compel arbitration. Applying the classic Downey three-factor test — (1) knowledge of the arbitration right; (2) action inconsistent with that right; (3) resulting prejudice to the opponent — the majority concluded:

• Knowledge: Petra conceded it always knew of its contractual option to arbitrate.
• Inconsistent Conduct: Petra’s decisive acts — securing Monarch’s stipulation to vacate default and filing an answer that omitted arbitration as an affirmative defense — signalled an intention to litigate, not arbitrate.
• Prejudice: Monarch incurred additional litigation costs and, more importantly, surrendered the strategic benefit of default. Allowing arbitration after that surrender would be inequitable.

The majority declined to decide whether Morgan v. Sundance alters Montana law, because Petra’s waiver was clear even under the existing Downey standard.

III. Analysis

A. Precedents Cited and Their Influence

1. Downey v. Christensen (1992)
   • Established Montana’s three-part test for waiver of arbitration.
   • Petra relied on Downey to argue that mere participation in litigation (filing an answer, counterclaims, limited discovery) does not equate to waiver.
   • The majority distinguished Downey, emphasising Petra’s silence during the motion to set aside default.
2. Montana Public Employees’ Ass’n v. City of Bozeman (2015) (“MPEA”)
   • Held that four years of inactivity was not waiver where the party never litigated on the merits.
   • Petra analogised its delay to MPEA. The Court rejected the analogy, stressing that Petra actively re-entered litigation.
3. Holm-Sutherland Co. v. Town of Shelby (1999)
   • Found waiver after years of dual-forum litigation and multiple trial settings.
   • Majority used Holm-Sutherland to illustrate prejudice and tactical gamesmanship.
4. Morgan v. Sundance, Inc., 596 U.S. 411 (2022)
   • U.S. Supreme Court eliminated the “prejudice” element from the federal waiver test under the FAA.
   • Monarch urged Montana to follow suit; Petra argued Morgan was inapplicable because Montana cases arise under the MUAA.
   • The majority sidestepped the question; the dissent confronted it, arguing Montana should drop the prejudice requirement to align with ordinary waiver doctrine.

B. The Court’s Legal Reasoning

“Petra sought to re-enter the litigation with no mention of its intent to leave the litigation at a later date and reinforced that position with its subsequent Answer.” — Shea, J.

Key threads in the majority analysis:

• Silence as Inconsistent Action. Waiver can arise from “inaction when action is required.” By choosing not to raise arbitration while obtaining Monarch’s cooperation to vacate a default, Petra behaved as though it accepted the court forum.
• The Default-Set-Aside as a Strategic Pivot. The Court treated the stipulated motion as a significant litigation step. A party cannot use the court’s equitable power (Rule 55(c)) to gain entry, then pivot to arbitration.
• Pleading Practice Matters. In Downey, defendants invoked arbitration in their first answer, preserving the right. Petra did not. Its later “incorporation by reference” gambit was deemed too obscure.
• Prejudice Beyond Dollars. The majority emphasised forfeiture of strategic advantage, not just costs. Monarch bargained away a default judgment in reliance on Petra’s apparent willingness to litigate.
• Avoiding the MUAA/FAA Clash. By finding waiver even under a stricter test (including prejudice), the Court avoided redefining Montana waiver law post-Morgan. The question remains open.

C. Potential Impact of the Judgment

1. Litigation Strategy: Parties who wish to arbitrate must raise the issue at the earliest materially relevant step — including when negotiating to set aside default or other procedural relief.
2. Drafting & Risk Management: General contractors, lenders, and employers — frequent users of “at our option” arbitration clauses — must train staff and registered agents to flag suits immediately so arbitration can be asserted timely.
3. Montana Waiver Doctrine Post-Morgan: Because the majority dodged the doctrinal conflict with Morgan, future litigants will likely re-raise whether “prejudice” remains part of the MUAA waiver analysis.
4. Court Resources: The decision discourages “flip-flop” litigation tactics, reducing wasted judicial time when parties oscillate between court and arbitration.
5. National Significance: The ruling joins a growing body of state-court cases (California, Alabama, Nebraska) refining waiver post-Morgan. Montana charts a middle path — keeping prejudice (for now) but tightening the inconsistency analysis.

IV. Complex Concepts Simplified

• Arbitration Clause at “Sole and Exclusive Option”. A contract term giving only one party (here, Petra) the unilateral ability to force disputes into private arbitration.
• Waiver. When a person knowingly relinquishes a contractual or legal right. Can be express (stated) or implied (inferred from conduct).
• Prejudice (in arbitration context). Legal detriment to the opposing party, e.g., significant litigation costs or loss of tactical advantage, caused by the late invocation of arbitration.
• Default & Rule 55(c) Set-Aside. A default is entered when a defendant fails to respond. Rule 55(c), M.R. Civ. P., allows setting it aside for “good cause,” often requiring the plaintiff’s consent or court finding of no prejudice.
• Incorporation-by-Reference Affirmative Defenses. Pleading device where a party adopts defenses raised by others. The Court signalled that arbitration must be expressly, not obliquely, pled.
• MUAA vs. FAA. Montana Uniform Arbitration Act (state law) and Federal Arbitration Act (federal law). Both favour enforcing arbitration agreements, but procedural nuances differ.

V. Conclusion

Monarch v. Petra establishes a pragmatic, bright(er)-line principle: a defendant who seeks substantive relief from a court — such as setting aside a default — must raise any intention to arbitrate at that moment or risk permanent waiver. The decision reaffirms the Downey triad, underscores the importance of candour during procedural negotiations, and signals to practitioners that “silence” can indeed be “action” when it misleads the opponent about forum selection. Whether Montana will ultimately align its waiver analysis with Morgan v. Sundance remains unsettled, but after Monarch, one thing is clear: opportunistic oscillation between court and arbitration will find little sympathy in Montana’s high court.