How do you trace premarital investments through a commingled brokerage account?

The commingling problem

When separate property funds are deposited into an account that also receives marital funds, the account becomes commingled. The separate property does not disappear, but it must be traced to be excluded from the marital estate. If the tracing is insufficient, the court may presume the entire account is marital.

Tracing methods

Several tracing methods are used depending on the circumstances:

• Direct tracing: Each separate dollar is followed through the account to its current form. This is the most precise but requires complete transaction records.
• Pro-rata method: The separate portion is calculated as a percentage of total contributions. If 30% of all deposits were separate property, 30% of the current balance is separate.
• Lowest-intermediate-balance (LIB) method: Used when the account balance never dropped below the separate property amount. The separate property is presumed to remain in the account.

The choice of method depends on the account activity, the quality of records, and the jurisdiction's rules. Utah courts have not codified a specific method, so the analyst must use the method that best fits the facts and is defensible.

What you need to trace

Successful tracing requires:

• Account statements covering the entire marriage period
• Records of the premarital balance and holdings
• Documentation of every deposit, including its source (marital earnings, inheritance, gift, sale of separate property)
• Documentation of every withdrawal and where the funds went
• Records of any transfers between accounts

The impact of market gains and losses

Separate property includes not just the original contribution but also the growth on that contribution. If $50,000 of separate property was deposited and the account grew 100%, the separate portion is $100,000 (assuming pro-rata tracing). Conversely, if the account lost value, the separate portion shrinks proportionally.

When tracing fails

Tracing can fail when:

• Historical statements are unavailable or incomplete.
• The account was repeatedly deposited to and withdrawn from without clear records.
• Separate funds were moved through multiple accounts without documentation.
• The separate property was used for marital purposes (such as paying household expenses), which may convert it to marital.

In these cases, the analyst can sometimes use indirect methods or reconstruct the history from secondary sources, but the result may be less precise.

Factors that typically matter

• Whether complete account statements exist for the full marriage period
• Whether deposits and withdrawals can be clearly attributed to separate or marital sources
• Whether the account balance ever dropped below the separate property amount
• Whether separate funds were used for marital purposes
• The number of accounts the funds passed through
• Whether the separate property was invested in identifiable securities that can be tracked

Documents commonly reviewed

• Account statements covering the full marriage and premarital period
• Transaction-level trade confirmations
• Bank records showing the source of each deposit
• Records of inheritances, gifts, or other separate property contributions
• Tax returns showing investment income
• Prior account statements from previous custodians

Common mistakes and misconceptions

• Assuming that because separate funds were deposited, they remain separate without tracing.
• Using only year-end statements, which miss intra-year transactions that affect the tracing.
• Failing to account for market gains and losses on the separate portion.
• Not documenting the source of each deposit, making it impossible to distinguish separate from marital.
• Letting historical statements expire or become unavailable before requesting them.

When a professional may be useful

A forensic analyst or CDFA® is essential when a brokerage account contains commingled separate and marital funds. The analyst reconstructs the account history, applies the appropriate tracing method, and produces a defensible calculation of the separate and marital portions. This work should be done early in the divorce process, before historical records become unavailable.