Commingling funds occurs when funds for a specific purpose or activity (such as trust account, estate account or conservatorship account) are mixed with unrelated funds—most commonly personal funds or unrelated business accounts. In some cases, commingling is not done in order to conceal fraud. It can happen because accounts were set up incorrectly, reimbursements were handled informally, or a fiduciary used the “wrong” account during a stressful period. Regardless of intent, commingling can create confusion, increase conflict, and make it harder to demonstrate that trust assets were handled properly.
Why commingling is a problem
Commingling matters for three main reasons:
1) It reduces transparency.
When fiduciary and personal transactions share the same account, it becomes difficult to tell which expenses were paid for the trust, which were personal, and whether reimbursements were handled accurately. Even legitimate expenses can look questionable without clear separation.
2) It complicates fiduciary accounting.
Fiduciaries generally need to provide an accounting that shows receipts, disbursements, and ending balances. Commingling increases the time and effort required to reconstruct a clean ledger, and it can lead to disputes over classification, timing, and documentation.
3) It increases risk—both practical and legal.
Mixing funds can expose the account to avoidable issues such as overdrafts, unintended tax reporting complications, or challenges from beneficiaries. It may also raise concerns about whether protected assets were used for improper purposes.
How commingling is investigated (in a neutral, records-based way)
A forensic review of commingling focuses on facts, documentation, and reproducible methods. Common steps include:
1) Identify all relevant accounts and time periods.
The review starts by confirming which accounts were used for what activity and the statement periods available. Gaps in records are noted early because missing months can create misleading “unexplained” items.
2) Reconstruct the transaction history.
Bank statements (and often check images, deposit items, wire/ACH details, and credit card records) are used to build a transaction-level ledger. Each item is categorized—such as trust expense, trustee reimbursement, beneficiary distribution, or unclear/pending support.
3) Separate fiduciary versus personal activity.
When transactions are mixed, the analysis works to identify which items clearly relate to the fiduciary’s expected activity and which do not. Where the purpose cannot be confirmed from available records, the item is flagged for follow-up rather than assumed improper.
4) Trace key transfers and reimbursements.
Transfers between accounts are matched to confirm destinations and to determine whether fiduciary funds are moved into personal accounts (or vice versa). Reimbursements are evaluated for documentation, timing, and whether they align with identifiable and appropriate expenses.
5) Present results with clear limitations.
A professional forensic report typically distinguishes between: (a) items that are supported, (b) items that may be supported but need more documentation, and (c) items that cannot be resolved without additional records.
Bottom line
When fiduciary funds and personal funds are mixed, even routine activity can become difficult to explain. A forensic accounting review helps organize the records, trace the movement of funds, and identify the support needed to resolve questions efficiently.