How Forensic Accountants Are Used in Fraud Litigation

What a forensic accountant actually does

A forensic accountant is a CPA or similarly credentialed professional who applies accounting and investigative methods to disputes. In a business fraud case the work falls into five tasks, and a given case may need one or all of them.

• Reconstruction. Rebuilding what actually happened from source records when the books were falsified: bank statements, check images, payroll runs, point-of-sale data, vendor master files, email approvals. The output is a corrected ledger and a chronology of each suspect transaction.
• Tracing. Following diverted funds from the company's account through intermediate accounts into the assets they became, applying the equitable rules for mixed accounts. This is the evidence that supports a constructive trust, as explained in recovering stolen business assets through constructive trusts.
• Lifestyle and net worth analysis. Comparing a suspect's known income with their spending and acquisitions over the period. A controller earning a modest salary who paid cash for a lake house has a gap the analysis quantifies, which supports an inference of hidden income and points to where the money went.
• Damages and disgorgement. Calculating what the plaintiff lost, what the defendant gained, lost profits with reasonable certainty, or the difference between a business as represented and as delivered. In a fiduciary case, computing the profits to be disgorged and the compensation subject to forfeiture.
• Data analytics. Running tests across large transaction sets to find anomalies: duplicate payments, round-dollar invoices, vendors with no tax ID, payments just under approval thresholds, and digit-frequency tests such as Benford's law that flag fabricated numbers. These tools find the pattern; the records then prove it.

When to bring one in

Earlier than most businesses do. The forensic accountant is useful before the lawsuit, when the question is still whether there was a fraud and how large it is. A preliminary review of a few months of bank activity can confirm or dispel a suspicion, size the loss for an insurance claim, and tell counsel which claims the evidence supports. Waiting until discovery means filing suit on an estimate, and the first affidavit in support of a temporary injunction will need specific numbers and specific accounts.

They are also needed on the defense side. A business accused of fraud, or a partner accused of taking money, often needs its own accountant to show that the transactions were authorized, properly recorded, or offset by amounts the other side ignores.

Consulting expert or testifying expert

The most consequential decision about a forensic accountant is made at retention, and it concerns discovery.

A consulting expert is retained by counsel to advise and prepare the case, and will not testify. Under Texas Rule of Civil Procedure 192.3 the identity, mental impressions and opinions of a consulting expert whose work has not been reviewed by a testifying expert are not discoverable, and their communications with counsel are protected. This lets the accountant explore theories, test the weak points of the case and report candidly without creating evidence for the other side.

A testifying expert will give opinions at trial, and Rule 195 opens their work. The party must designate the expert by the deadline in Rule 195.2: 90 days before the end of the discovery period for experts testifying for a party seeking affirmative relief, and 60 days before for all other experts, unless the court orders otherwise. Rule 195.5 requires disclosure, without a request, of the expert's identity and contact information, the subject matter of the testimony, the general substance of their opinions and a brief summary of the basis, and, for a retained expert, all documents and data provided to, reviewed by or prepared for them in anticipation of testimony, their resume and publications, a list of other cases in which they testified in the previous four years, and a statement of their compensation. The expert may be deposed, and the court may order their calculations and supporting data reduced to a written report.

Two protections survive even for a testifying expert. Rule 195.5(c) protects communications between the party's attorney and the expert except to the extent they concern compensation, identify facts or data the attorney provided that the expert considered, or identify assumptions the attorney provided that the expert relied on. Rule 195.5(d) protects draft reports and draft disclosures.

Many cases use two accountants: a consulting expert who does the exploratory work, and a testifying expert who is given a defined set of records and reaches opinions that can withstand cross-examination. If one person does both, everything they reviewed in the consulting phase becomes discoverable once they are designated.

The reliability standard: Robinson

Expert testimony in Texas state court is admitted under Rule 702 of the Texas Rules of Evidence, which requires that the witness be qualified and that the testimony assist the factfinder. In E.I. du Pont de Nemours & Co. v. Robinson (Tex. 1995) the Texas Supreme Court held that the trial court must act as gatekeeper and exclude expert testimony that is not relevant and reliable, and it listed factors for assessing reliability: whether the theory or technique can be or has been tested, the extent to which it relies on the expert's subjective interpretation, whether it has been subjected to peer review or publication, its potential rate of error, whether it is generally accepted in the relevant community, and the non-judicial uses to which it has been put. Later decisions added that an expert's opinion must be connected to the facts of the case by a reliable foundation rather than by the expert's say-so, and that an opinion with an analytical gap between data and conclusion is excluded.

For forensic accounting this means the method matters as much as the conclusion. A tracing analysis that applies recognized rules to complete bank records is reliable. A damages model built on management's revenue projections without testing them, or a lost-profits opinion for a business with no history of profit, draws a Robinson challenge. In federal court, Federal Rule of Evidence 702 and the Daubert line of cases impose the same gatekeeping, with the 2023 amendment to Rule 702 making explicit that the proponent must show reliability by a preponderance of the evidence.

Example

Suppose a Denton manufacturing company suspects its purchasing manager of taking kickbacks from a supplier. Counsel retains a forensic accountant as a consulting expert, who reviews two years of purchase orders and finds that one supplier's unit prices rose 22 percent while comparable suppliers' prices were flat, that its invoices cluster just below the manager's $25,000 approval limit, and that the manager's lifestyle shows spending far above salary. That report goes to counsel only. Suit is filed, the supplier's bank records are subpoenaed, and a second forensic accountant is retained to testify. She is given the purchase records, the supplier's bank records showing monthly transfers to the manager's spouse, and the market price data, and she opines on the overcharge and the kickback total. Her designation, documents reviewed, prior testimony and fee are disclosed under Rule 195. Her method, comparing contract prices with contemporaneous market prices and tracing the transfers, is the kind that satisfies Robinson.

What the business needs to provide

Complete records, in native form, for every account and system the suspect touched: bank and credit card statements and check images, the general ledger with audit trails, payroll, vendor and customer master files, point-of-sale or billing exports, and email. Gaps are expensive, because the accountant must reconstruct what the missing record would have shown. The company should also provide the people who understand the systems and the approval processes, and the policies that were supposed to apply. Preservation of all of this from the first day is covered in what evidence to save before suing.

What drives the cost

The volume of transactions, the number of accounts the money passed through, the state of the records, the length of the period, and whether the engagement is a targeted review or a full reconstruction. A case about a single diverted wire needs hours; a five-year ghost-vendor scheme through four accounts needs weeks. Testifying adds the deposition, the report and trial preparation. A litigator and the accountant will usually agree on a phased scope: a preliminary review to confirm the fraud and size it, then a fuller engagement if the case proceeds. Numbers for a particular matter come from that scoping conversation, not from a general estimate.

How the work is used

The forensic accountant's output appears at every stage: the sworn proof of loss for the insurer, the affidavit supporting a temporary injunction, the demand letter's figures, the subpoena targets, the mediation presentation, and the trial testimony on damages and tracing. On the defense side, the same work tests the plaintiff's numbers and often shrinks them. The question of when any business case needs an expert is addressed in when a business case needs an expert witness. Tina Wysk works with forensic accountants in business fraud and fiduciary cases in Dallas state and federal courts.