How a business valuation actually runs through a family law property settlement.

The family law business valuation process runs under the Federal Circuit and Family Court of Australia (Family Law) Rules 2021: both parties jointly appoint one valuer as single expert witness, agree a joint letter of instruction, the valuer values the business at an agreed date (often value-to-the-owner, not market value), and delivers one report both parties are bound by. Prismi acts as single expert or reviewing valuer in these matters.

Why family law valuations run differently to every other engagement

A family law business valuation runs differently to a tax or commercial valuation because it sits inside adversarial litigation (or pre-litigation negotiation) between two parties with opposing financial interests, not a single instructing party. The Federal Circuit and Family Court of Australia (Family Law) Rules 2021 address this by defaulting to a single expert witness model: one valuer, jointly instructed, whose report both parties are bound by unless the court permits a further expert. This changes how the engagement is instructed, what disclosure is required, how questions are handled after the report is delivered, and how the basis of value is framed. An adviser or self-represented party approaching a family law valuation the same way they would approach a CGT valuation prepared under ATO market valuation guidance will misjudge the process at several points.

The single expert framework — and when it doesn't apply

Under the Federal Circuit and Family Court of Australia (Family Law) Rules 2021, parties may jointly appoint a single expert witness by agreement, or the court may order one on its own initiative. Once a single expert is appointed, no further expert evidence on that issue may be adduced without the court's permission. Under Rule 7.08 of the Rules, that permission is granted only where there is a substantial body of opinion contrary to the single expert's opinion and necessary for determining the issue, another expert has knowledge of matters unknown to the single expert that are necessary for determining the issue, or there is another special reason for adducing evidence from another expert. This is why the single expert is sometimes called the joint expert: functionally, both parties are bound by one valuation opinion unless they can meet one of these specific grounds. For the valuer, this is expert witness work rather than an advisory report — a Valuation Engagement under APES 225, carried out under the expert witness obligations of APES 215, with the paramount duty owed to the court rather than to either party. Adversarial (party-appointed) experts remain possible in limited circumstances — for example, where the parties cannot agree on a single expert and the court permits separate reports, or in complex matters where the court considers competing expert evidence will genuinely assist. These situations are the exception, not the default, and should not be assumed available without a specific court order or party agreement.

Joint instruction: why the letter of instruction matters more here than anywhere else

In a single-party engagement, the instructing party and the valuer agree the purpose, scope and basis of value directly. In a family law engagement, the letter of instruction is (or should be) settled jointly by both parties' lawyers before it goes to the valuer, because it fixes the questions the report will answer: the entity or interest to be valued, the valuation date, the basis of value, the documents each party must provide, and the specific questions the valuer is asked to address. A poorly scoped or one-sided letter of instruction is one of the most common sources of later dispute — if the basis of value or valuation date is ambiguous, or if one party's documents were never properly requested, the report can be challenged on process grounds before its substance is even considered. Prismi will only accept a single expert appointment on a joint letter of instruction, or on instructions the court has settled; we decline engagements where one party attempts to instruct unilaterally on a matter that requires both parties' agreement.

Value to the owner: the standard that makes family law valuations different

Family law valuations are not automatically prepared on a fair market value basis. Fair market value — the basis defined in IVS 104 and reflected in ATO market valuation guidance for tax purposes — asks what a hypothetical willing-but-not-anxious buyer would pay a hypothetical willing-but-not-anxious seller. Value to the owner asks what the interest is actually worth to the person who holds it and may continue to benefit from it indefinitely — including advantages that would not transfer to a third-party purchaser, such as above-market owner remuneration, personal goodwill, or continued control benefits. Following Turnbull v Turnbull (1991) FLC 92-258, Australian courts have accepted that shares in a private family company may be valued on a value-to-the-owner basis rather than a pure market-exit basis, particularly where the owner is expected to retain the interest. Which basis applies is not automatic — it should be specified in the letter of instruction, and the valuer's report should state which basis was adopted and why, because the two bases can produce materially different conclusions for the same business.

Disclosure: the document list a single expert will require

A single expert in a family law business valuation will typically request the following documents from both parties before work can begin.

• ·Full financial statements and tax returns for the entity, typically 3–5 years
• ·Current year-to-date management accounts and general ledger detail
• ·Company constitution, shareholder register, and any shareholders' or partnership agreement
• ·Related-party transaction records, including loans to or from either party personally
• ·Personal income tax returns and drawings/distribution history for both parties where relevant to owner remuneration adjustments
• ·Asset register, lease agreements and any recent third-party offers or sale discussions
• ·Prior valuations of the same entity, if any exist
• ·A completed Financial Statement or equivalent disclosure document from each party (as required under the Rules), to the extent it bears on the business

Conclaves, questions to the expert, and how a report is actually challenged

A single expert's report is not immune from challenge, but the mechanism is narrower than in general commercial litigation. Either party may put written questions to the expert to clarify or elaborate on the report, within the timeframe fixed by the rules or court order; the expert answers those questions in writing, and the answers form part of the evidence alongside the report. Where the matter is complex or contentious, the court may direct a conclave — a conference between experts (where more than one is permitted) or between the single expert and the parties' advisers — to narrow the issues genuinely in dispute before trial. Beyond questions and conclaves, a party who wants to depart from the single expert's conclusion generally needs the court's permission to rely on further expert evidence, and that permission is not given lightly. In practice, this means the real contest is rarely "our valuer versus their valuer" — it is whether the instructing questions were adequate, whether the disclosure was complete, and whether the written answers to questions expose a genuine flaw in methodology or evidence.

Which Prismi engagement tier fits a family law matter

Family law business valuations sit toward the higher end of complexity because the report must withstand scrutiny from both parties' advisers and, potentially, the court. A single owner-operated trading business with straightforward financials and an uncontentious basis of value can sometimes be handled at Comprehensive, from $3,995 + GST (15–25 business days) — this suits matters proceeding by agreement where both parties accept a single, well-reasoned report. Where the matter is contested, involves multiple entities, related-party structures, or a real prospect of written questions and possible court scrutiny, the Defensible Valuation File, from $8,995 + GST (25–35 business days), is the more appropriate tier — it is built to the depth a single expert report needs to survive questions and, if required, cross-examination. For matters with genuinely complex structures, disputed methodology positions, or where the adviser wants formal scenario and sensitivity analysis to support negotiation, the Valuation Range & Scenario Review, from $12,995 + GST (30–45 business days), is built for that level of complexity. Retrospective valuation dates (common in family law, where separation date and hearing date differ) add $495 per additional historical date; additional entities are $750 each. We do not recommend Essential tier for family law matters — the depth of disclosure and reasoning a single expert report requires generally exceeds what that tier is scoped to deliver. Prismi prepares independent valuations only — we are not a registered tax agent and do not provide legal advice; whether a single expert appointment, letter of instruction or basis of value is appropriate for a given matter is a question for the parties' family lawyers.