Expert Determination: Scope, Evidence and Outcome

What Expert Determination Decides

Expert determination decides the question assigned by agreement, using the procedure that agreement requires or permits. The appointment can concern a completion account, a valuation or another defined dispute. The expert’s professional title alone gives them no authority over the parties’ wider disagreements.

An expert witness gives opinion evidence for a court or tribunal to evaluate. A mediator helps parties negotiate an agreement. A determining expert makes the decision entrusted to them. Commercial arbitration has a distinct legal framework, while a referee inquiry derives its scope from the court’s reference. Those procedures cannot be substituted merely because each involves a specialist.

Read the clause, any incorporated rules and the appointment together. Identify the issues, permitted method and conditions of finality. A clause can make the result binding, reserve specified matters for court or provide a contractual route to reconsideration. Do not infer those effects from the phrase expert determination in isolation.

In Shoalhaven City Council v Firedam Civil Engineering Pty Ltd, the High Court examined the particular contract and its reasons requirement. It upheld the determination against the alleged inconsistency. The case illustrates why the agreed task and procedure control the analysis, instead of a general expectation that an expert will act like a judge.

Read the Mandate Before Instructing the Expert

Define the precise question before sending the expert a document bundle. Identify the parties and contractual dispute, then quote the operative referral in the instruction letter. Record the valuation basis or accounting definitions and any assumptions the expert must adopt. Specify the relevant measurement point and whether later information can be considered.

For a completion-account dispute, distinguish authority to calculate an adjustment from authority to interpret a disputed contractual definition. A clause can confer both powers, but an appointment limited to arithmetic does not automatically resolve a legal construction issue. State which issues remain outside the referral and who will resolve them.

Check the proposed expert’s qualifications against the task. An accounting qualification and experience in completion accounts address different questions from property-valuation expertise. Obtain conflict disclosures covering the parties, advisers and material prior appointments. Record the required independence and how a later conflict will be handled.

Confirm access to records, who pays the fees and whether payment is required before work starts. Follow the agreed nomination mechanism if the parties cannot choose an expert. Do not appoint one unilaterally unless the contract permits that route. A professional body’s model nomination process applies only if the parties have adopted it or otherwise authorised its use.

The Resolution Institute’s determination guide and rules contain model agreement and retainer documents. Use the adopted version when identifying the process. The guide is a contractual option, not a compulsory national procedure for every determination.

Build a Common Financial Evidence Record

Reconcile the financial record to the question referred and identify where the parties disagree. Start with the contractual calculation and work back to the supporting accounts. Give each adjustment a reference, amount and explanation. Mark whether the dispute concerns the underlying transaction, its classification or the contract’s meaning.

Consider this fictional completion account. The contract sets target working capital at $200,000 and adjusts the price dollar for dollar for the difference. The prepared account shows working capital of $235,000, producing an initial $35,000 increase. The following items are separately identified and do not overlap.

Fictional Completion-Account Adjustment

Item	Treatment in prepared account	Proposed adjustment	Issue for the referral
Duplicated debtor entry	Included twice	Minus $12,000	Arithmetic and source reconciliation
Customer receipt	Treated as current revenue	Minus $8,000	Whether an unperformed obligation creates a liability
Director loan	Included as a current liability	Plus $30,000	Whether the contract excludes this debt

Removing the duplicated debtor reduces working capital to $223,000. If the customer receipt requires an $8,000 liability under the agreed accounting policy, the result becomes $215,000. That gives a $15,000 price increase over the target. These calculations assume every other balance remains unchanged.

Excluding the $30,000 director loan would instead produce $245,000 working capital and a $45,000 increase. The $30,000 difference between outcomes turns on the contract’s debt definition. If interpreting that definition falls outside the expert’s mandate, identify the reserved question and supply both calculations. Do not conceal the legal issue inside an accounting adjustment.

Attach the ledger entries and debtor records for the duplicate, plus the contract and performance evidence for the customer receipt. Match bank receipts and payments to source statement entries. A receipt proves cash movement but does not by itself establish revenue recognition or the contractual treatment of debt.

FinTrace analyses supplied bank statements into a searchable ledger and a findings report. Its PDF filename and page references put the underlying transaction evidence beside the findings, reducing manual statement review for the financial team. Include that analysis as source-linked material in the evidence bundle. Keep the appointed expert’s determination separate from the statement analysis and any party’s proposed calculation.

Follow the Agreed Submission and Decision Process

Follow the appointment’s timetable and permitted exchanges, recording each submission and response. Identify who receives the material and when the record closes. Confirm any records inspection, site access or expert questions before relying on evidence obtained through that process.

Use this sequence to keep the referral and evidence together.

1. Issue the final instruction with the operative clause and a list of the referred issues. Confirm acceptance of the appointment and the applicable rules.
2. Supply a common indexed record, including the financial reconciliation. Separate agreed facts from each party’s proposed treatment.
3. Make submissions on the referred questions within the required timetable. Give the other party the access and response opportunity the agreed process requires.
4. Record expert questions and the answers supplied. Where private communications are restricted, use the required shared channel.
5. Confirm the closing record and the required form of decision, including reasons where the appointment requires them.

If a late bank statement changes a figure, identify the affected rows and request the procedure allowed by the appointment. Record whether the expert admits it and whether a response follows. Do not silently replace the evidence bundle with a different version.

A request to add a new dispute needs separate attention. Determine whether the clause permits that extension and obtain any required agreement. The expert cannot assume authority to enlarge the question merely because another issue would be convenient to resolve. Keep the accepted scope and any variation in the record.

Verify the Determination and Its Consequences

Compare the determination with the contractual question before implementing its result. Confirm the issues decided, measurement basis and arithmetic. Check whether reasons were required and whether the decision follows the specified form. Record any available correction mechanism and its time limit before using it.

For the fictional account, an expert who adopts working capital of $215,000 produces a $15,000 increase against the $200,000 target. Trace that outcome through the accepted adjustments. If the decision instead uses $245,000, establish how it treats the director loan and whether that issue was within the referral. A different figure requires explanation through the decision and mandate, not an assumption that the expert made an arithmetic mistake.

Under Australian contract law, disagreement with a final and binding outcome does not create an ordinary appeal. In Golding v Primavera Holdings Pty Ltd, the ACT Supreme Court applied Legal & General Life of Australia Ltd v A Hudson Pty Ltd. Mistake alone does not invalidate the result unless it shows the determination was not made in accordance with the contract. The court also examined what the particular requirement to consider submissions demanded.

Distinguish a possible failure to perform the agreed task from an adverse evaluation within that task. Assess any allegation of fraud or material departure against the governing law and actual terms. A contractual manifest-error exception needs its own construction. It cannot be assumed from a party’s dissatisfaction.

Identify the payment or other performance required, who must perform it and when it falls due. If enforcement or a challenge is necessary, preserve the contract, appointment and complete procedural record. Obtain advice on the specific court remedy and any urgent protective step. A complaint to the expert does not itself suspend a payment obligation or extend a contractual deadline.

Complete the file with the calculation adopted, any authorised correction and evidence of performance. The expected result is a determination connected to its mandate and an implemented adjustment that can be reproduced from the recorded figures.