What Is the Lowest Intermediate Balance Rule (LIBR)?

Tracing separate funds inside one commingled account

The Lowest Intermediate Balance Rule (LIBR) — also discussed as the minimum sum balance or lowest intermediate balance test — is a tracing method used when separate funds are deposited into an account that also holds marital or community funds. Rather than treating every dollar as fungible, LIBR replays the account chronologically and asks how much separate property could still be identified after withdrawals reduce the balance.

The critical step is the lowest intermediate balance: the lowest account balance reached after the separate-property deposit. If the balance dips below the claimed separate amount, the traceable separate-property figure is reduced to that low point. Under the LIBR assumption, later deposits generally do not automatically restore earlier separate-property trace value unless applicable facts and legal theory support a different treatment.

Exit Protocol applies LIBR as a deterministic tracing assumption on selected financial records, then exports an attorney-reviewable workpaper with disclosed calculation settings, a material transaction ledger, source provenance, and SHA-256 snapshot integrity. Attorneys and forensic accountants must decide whether LIBR is appropriate for the jurisdiction, the account history, and the legal theory in the matter.

How LIBR replays as a state machine and V1 export path

These diagrams complement the worked example below. They show the chronological LIBR assumption and how Exit Protocol turns selected records into an attorney-reviewable workpaper with integrity surfaces.

stateDiagram-v2
    [*] --> Baseline: pre-existing balance
    Baseline --> ClaimOpen: separate-property deposit
    ClaimOpen --> Replay: chronological replay
    Replay --> AboveTrace: balance at or above trace level
    Replay --> DipDetected: withdrawal below trace level
    DipDetected --> TraceReduced: cap at lowest intermediate balance
    TraceReduced --> Replay: continue replay
    AboveTrace --> Replay
    Replay --> LaterDeposit: later marital or community deposit
    LaterDeposit --> HoldTrace: account balance rises
    HoldTrace --> FinalRemainder: replay complete
    FinalRemainder --> [*]: export traceable remainder

flowchart LR
    A[Selected account] --> T[Transactions]
    T --> C[SeparatePropertyClaim]
    C --> S[Disclosed settings]
    S --> L[LIBR calculation]
    L --> FR[ForensicReport]
    FR --> PDF[Attorney-reviewable PDF]
    PDF --> EV[Evidence Vault]
    PDF --> V["/verify/"]

How a balance dip limits traceable separate property

The table below uses round numbers for teaching purposes. It illustrates the LIBR assumption that a later marital deposit does not replenish trace value after a withdrawal creates a dip.

Swipe horizontally to view all ledger columns on tablet widths.

Account balance rises to $65,000 after the salary deposit, but the LIBR traceable amount remains $45,000 because the lowest intermediate balance after the separate-property deposit was $45,000. Reviewers should treat this as a teaching illustration — real matters require source records, jurisdiction-specific doctrine, and professional judgment.

How Exit Protocol applies LIBR deterministically

Exit Protocol converts selected financial records into a V1 single-claim LIBR workpaper. The platform does not silently substitute narrative for math. Each stage is inspectable.

1. User selects the account or financial record to analyze.
2. Transactions are normalized into consistent dated ledger rows.
3. Opening balance, deposits, withdrawals, and closing balance are reconciled.
4. A separate-property claim is opened on the selected account.
5. The selected same-day ordering mode is applied deterministically.
6. A material transaction ledger is generated for review.
7. The workpaper discloses methodology, source provenance, snapshot SHA-256 integrity, traceable remainder, and final file hash verification for generated exports.

Calculation assumptions, not legal conclusions

When same-day transactions or ordering ambiguity exist, Exit Protocol exposes mechanical ordering modes so reviewers can compare sensitivity scenarios. These settings change calculation order — they do not favor a party or decide legal ownership.

Manual spreadsheet tracing vs. Exit Protocol LIBR workpaper

Swipe horizontally to compare all review surfaces on tablet widths.

Research sources consulted for this guide

• See v. See, 64 Cal.2d 778 (1966) — California Supreme Court discussion of tracing burdens, acquisition-time proof, and adequate recordkeeping after commingling. It is background for California tracing principles, not a specification of Exit Protocol's LIBR algorithm.
• In re Marriage of Walrath, 17 Cal.4th 907 (1998) — addresses Family Code section 2640 tracing of separate contributions through refinanced property into later assets. The opinion notes that different tracing methods apply to commingled bank accounts, so it is not presented here as authority for the product's LIBR formula.
• Charles J. Fitzpatrick, The Commingling of Separate and Community Funds: The Requirement of Tracing in Texas, 6 St. Mary's L.J. (1974) — Texas-specific tracing and commingling analysis.
• Forensic and family-law educational summaries describing direct tracing, family expense/exhaustion methods, and minimum sum balance / lowest intermediate balance approaches (methods vary by jurisdiction).

These sources inform the educational framing of this page. They do not constitute legal advice, and they do not mean LIBR applies in every matter or jurisdiction.