Commingling typically arises when a spouse deposits separate funds — an inheritance, a premarital savings account, proceeds from a separately owned asset — into a jointly titled account, or uses separate funds to improve or pay down a jointly owned asset such as a marital home. Once mixed, the separate character of the funds can become legally obscured, and many courts will treat commingled funds as marital property unless the spouse claiming separate status can trace the funds back to their separate source with sufficiently clear records.

Not all commingling is fatal to a separate-property claim. Courts in most states allow tracing — using bank statements, account histories, and transaction records to reconstruct which portion of a mixed account or asset remains attributable to the separate source. The strength of a tracing claim depends heavily on recordkeeping quality; sporadic transfers over many years with incomplete documentation are far harder to trace than a single, well-documented deposit.

Juricratic treats a tracing claim's likely success as a dial informed by the quality of the documentary record a user inputs, showing how the projected marital estate shifts between a full-commingling scenario and a successful-tracing scenario rather than declaring a single outcome.

Forensic accountants and family law attorneys reconstruct account histories to either establish or defeat a tracing claim, since the practical effect of a commingling finding — converting a separate asset into a divisible marital one — can be one of the largest single swings in a divorce's total exposure. Early identification of commingled accounts also shapes discovery scope and expert budget.