Business Interruption Expert Reports & Federal Rule of Evidence 702 Compliance
A Federal Rule of Evidence 702 expert report is the primary vehicle through which a business interruption expert’s opinions are placed before the US federal and state courts - a structured document governed by Federal Rule of Evidence 702, Rule 26, and the overriding objective, not an informal loss calculation memo. Judges expect clarity on assumptions, data limitations, and the expert’s duty to the court rather than to the retaining party.
Core components of a Daubert-compliant BI report
Reports should identify instructions, materials reviewed, qualifications, and the factual basis for each opinion. For BI quantum, that includes explicit definition of projected revenue, business income margin derivation, extra expense testing, period of restoration boundaries, and reconciliation to trial bundles.
Visual aids - time-series charts, waterfall bridges, and formula walkthroughs - improve comprehension but must faithfully reflect underlying spreadsheets disclosed in concurrent evidence.
Daubert duties in financial expert work
Daubert line of authority requires independence, objectivity, and fair exposition of rival methodologies where legitimate debate exists. In BI cases, that may mean presenting insurer-friendly and policyholder-friendly sensitivities on growth rates, or explaining why a particular seasonality adjustment is debatable within professional practice.
Experts should avoid partisan language, ad hominem commentary on opposing counsel, or vouching for the honesty of witnesses - those missteps invite satellite applications and undermine credibility.
Single joint experts vs party-appointed experts
Courts sometimes appoint a court-appointed expert on discrete technical issues, but high-value BI quantum disputes more commonly feature party-appointed experts followed by a joint statement under CPR Rule 26. The joint statement should isolate numerical disagreements, identify shared datasets, and flag any data requests still outstanding.
Practical checklist before exchange
Confirm the expert has reviewed pleadings, key correspondence on coverage positions, and the insured’s accounting policies. Ensure appendices include workpaper references that enable efficient expert conferences at trial.
Related Case Types
Deep-dive overviews with FAQs and structured data for common dispute patterns linked to this guide.
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