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HB 1646

Modifies provisions relating to the collateral source rule

2026 Regular Session Introduced by Matthew Overcast

HB 1646 changes how collateral source benefits are credited against damages in civil cases, altering the net recovery for plaintiffs and liability for defendants.

Referred: Emerging Issues(H)
#civilprocedure #courts #evidence
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Bill Summary · HB 1646

Bill summary: HB 1646 (Missouri, 2026) — Modifies provisions relating to the collateral source rule

Purpose and intent

HB 1646 seeks to modify how collateral source benefits are treated in civil liability cases in Missouri. The collateral source rule generally prohibits a defendant from reducing liability by benefits the plaintiff has already received from third parties (such as insurance or other sources). This bill aims to adjust the application of that rule in specific ways, potentially altering how damages are calculated and recovered in lawsuits.

Key provisions and changes

  • Alteration of collateral source rule application: The bill changes how collateral source benefits are considered in calculating damages in civil actions. Although the exact text is not provided here, changes typically involve:
    • Limiting or clarifying when collateral sources can offset damages awarded to plaintiffs.
    • Defining which sources qualify as collateral payments (e.g., private insurers, government programs, or ERISA-plan benefits).
    • Establishing procedures for presenting collateral source evidence or credits at trial or in settlement discussions.
  • Impact on damages recovery: By modifying the collateral source rule, the net damages that a plaintiff can recover from a defendant may increase or decrease depending on the bill’s precise language. The intent is usually to balance the interests of plaintiffs receiving insurance or other benefits with defendants’ liability.
  • Interactor provisions: The bill may include provisions affecting:
    • How collateral sources interact with premium payments, rebates, or deductible arrangements.
    • The timing of when collateral source credits are applied (trial verdict vs. post-judgment adjustments).
    • The treatment of settlements and whether collateral source benefits reduce settlement amounts or verdicts.

Who would be affected

  • Plaintiffs and defendants in civil cases: Parties involved in personal injury, medical malpractice, product liability, or other tort actions could see changes in how collateral source money influences final damages.
  • Insurance providers and benefit administrators: Entities paying or arranging collateral benefits may be affected by reporting requirements or how their payments are credited in court.
  • Judiciary and litigants: Courts may adopt new evidentiary standards, trial procedures, or timeline requirements related to collateral source evidence.

Procedural and timeline aspects

  • Referral and consideration timeline:
    • Prefiled in December 2025.
    • Read First Time on January 7, 2026.
    • Read Second Time on January 8, 2026.
    • Referred to Emerging Issues (H) on May 15, 2026.
  • Sponsor information: Co-sponsor Matthew Overcast. This indicates potential alignment with reform or clarification efforts in collateral source practice.
  • Implementation timeline: As a 2026 bill, enactment would follow standard Missouri legislative rules after passage by both chambers and signature or veto override. If enacted, the changes would take effect on a date specified in the bill (often upon enactment or a defined future effective date).

Potential impact and considerations

  • Impact on trial strategy: Lawyers may need to adjust how they present collateral source evidence and how damages are framed to reflect the modified rule.
  • Equity and compensation concerns: The bill’s changes could shift the distribution of financial recovery between plaintiffs and defendants, depending on whether collateral sources are credited against damages.
  • Administrative considerations: Clear definitions and procedures in the bill would be important to reduce confusion and ensure consistent application across cases and courts.

Note: The analysis above reflects typical features of collateral source reform bills. The exact text of HB 1646 would provide precise definitions, credits, exceptions, and effective dates needed for a definitive synopsis.

Compiled from official sources — confirm details with the bill’s official record.

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