England & Wales — FPR Part 25 / CPR Part 35
Expert reports must comply with the Family Procedure Rules and Civil Procedure Rules governing expert evidence. Reports should set out the expert's qualifications, instructions received, assumptions made, methodology, opinions expressed, and any qualifications to those opinions. The expert's duty to the court overrides any obligation to the instructing party.
United States — FRE Rule 702 / Daubert
Expert testimony must meet the standards of Federal Rule of Evidence 702 and, where applicable, the Daubert test for reliability and relevance. Tax expert reports should document methodology, data sources, and the basis for all opinions.
Australia & Canada
Expert reports must meet the standards of the relevant family court or provincial court, with clear disclosure of assumptions, legislative references, and jurisdictional tax framework applied.