Legal Billing

Legal Billing

Cardinal Rule

Every time entry, invoice, and trust transaction must be accurate, honest, and contemporaneous. ABA Model Rule 1.5 requires fees to be reasonable; Rule 1.15 requires client funds to be held inviolate. Neither rule admits exceptions for administrative convenience, workload pressure, or revenue targets. A billing decision that cannot survive bar disciplinary scrutiny must not be made.

Fail-Fast Rule

Stop and escalate to the responsible attorney when any of the following is detected:

• A time entry is being reconstructed from memory more than seven days after the work was performed — label it estimated-reconstruction and flag for attorney review before invoicing.
• A trust account disbursement would produce a negative client-ledger balance — reject and require source-of-funds clarification first.
• Block billing appears on a matter whose client guidelines explicitly prohibit it — hold the invoice and require entry decomposition.
• A fee agreement for a contingency arrangement is not confirmed in writing before the matter proceeds — oral contingency arrangements are unenforceable in most jurisdictions.
• Personally identifiable data from a client matter is being transmitted, stored, or shared outside encrypted channels — halt and apply the PII controls below before proceeding.

When to Apply

Apply this skill when:

• Classifying individual time entries as billable, non-billable, or write-down candidates under ABA Rule 1.5 reasonableness factors.
• Drafting or reviewing billing narratives for specificity and professional ethics compliance.
• Designing or auditing IOLTA / trust account procedures, including three-way monthly reconciliation.
• Structuring a fee arrangement (hourly, flat, contingency, hybrid) or advising on retainer replenishment thresholds.
• Evaluating expense pass-through eligibility and markup ethics.
• Applying jurisdictional fee-rule compliance for US state bars, EU bar associations, or OAB Brazil.
• Auditing a billing system for PII exposure risk or cross-border data-transfer compliance under LGPD Art. 11 or GDPR Art. 9.

Do not apply when the task is general accounts-receivable management outside a legal context — use domains/finance-accounting/skills/bookkeeper-controller for that.

PII Handling

Legal billing data is inherently PII-dense and may carry legal professional privilege. The following controls are mandatory.

Data categories and classification:

Mandatory controls:

• Never transmit client matter data over unencrypted channels (plain email, HTTP, unencrypted file share). Use end-to-end encrypted legal portals or TLS-in-transit with at-rest encryption.
• Retention schedules must be matter-type-specific: active matters — retain for the duration plus the applicable limitation period (varies by jurisdiction; minimum seven years in most US states; OAB Brazil resolves to five years post-matter-close); trust transaction records — retain for the full limitation period applicable to bar disciplinary proceedings.
• LGPD Art. 11 sensitive-category analysis: health information appearing in personal-injury or workers'-compensation billing narratives, racial or ethnic origin in discrimination matters, and religious affiliation in estate-planning context are sensitive personal data. Processing requires explicit legal basis beyond the general Art. 7 list; consent or legal- obligation bases are typical. Document the basis in the data-processing registry.
• Cross-border transfer of client matter data (e.g., cloud billing platform hosted outside Brazil) requires a valid transfer mechanism under LGPD Art. 33: adequacy decision, standard contractual clauses, or explicit client consent. Verify transfer mechanism at platform onboarding, not after.
• Access control: billing personnel access must be scoped to matters they administer. Role-based access with audit logging. No bulk export without attorney approval and logged justification.
• For full LGPD implementation detail, cross-reference core/compliance-lgpd.

Billable Classification

ABA Model Rule 1.5 reasonableness factors (applied as a classification checklist before entry approval):

1. Time and labour required; novelty and difficulty of the questions involved.
2. Likelihood that acceptance of the engagement precludes other employment.
3. Customary fee in the locality for similar legal services.
4. Amount involved and results obtained.
5. Time limitations imposed by the client or circumstances.
6. Nature and length of the professional relationship with the client.
7. Experience, reputation, and ability of the attorney performing the work.
8. Whether the fee is fixed or contingent.

Non-billable taxonomy:

Rounding ethics: Round to the nearest 0.1-hour increment (six-minute minimum). Rounding up consistently to the nearest 0.5 or 1.0 hour is an ethical violation under Rule 1.5 and subject to fee arbitration.

Block-billing restriction: On any matter where client billing guidelines or a court fee application prohibit block billing, each discrete task must appear as a separate line entry with individual time. A single narrative combining multiple tasks is permissible only where the guidelines explicitly allow it and each constituent task is still described.

Time Entry Discipline

Contemporaneous capture requirement: Time must be captured on the day work is performed. Entries reconstructed from memory carry elevated dispute risk and reduced ethical defensibility. The outer limit for reconstruction without labelling is seven calendar days; beyond that, entries must be marked estimated-reconstruction and reviewed by the responsible attorney before invoicing.

Narrative quality standard: Each entry must answer three questions: (1) what action was taken; (2) on what subject-matter or document; (3) to what purpose or result. Entries that answer fewer than two of the three questions are rejected and returned for revision before billing review.

UTBMS task-code mapping (litigation matters):

Transactional, real estate, and estate-planning matters use the B-series and P-series UTBMS codes respectively. Confirm the applicable code set with the client billing guidelines at engagement inception.

Matter-aware coding: Each entry must be associated with the correct matter number. Cross-matter time allocation (one activity spanning two matters) must be split at entry time with separate entries for each matter; never apportion retroactively via journal adjustment without attorney sign-off.

Trust / IOLTA Accounting

Segregation of client funds: Client funds held in advance of earning, cost advances, settlement proceeds pending distribution, and escrow must be maintained in a dedicated trust account separate from the firm operating account. Commingling — depositing firm funds into the trust account or using client funds for firm expenses — is bar discipline misconduct in every jurisdiction.

Permitted trust-to-operating transfers: Transfer of earned fees from trust to operating occurs only after the fee is earned and the client has been notified. Transfers in anticipation of earning fees are premature and constitute commingling.

Three-way monthly reconciliation requirement:

1. Bank statement ending balance.
2. Sum of individual client-ledger balances (each client's sub-account).
3. Trust journal or system balance.

All three figures must agree. Any variance requires same-day investigation and written explanation before the month closes. Unresolved variances are reported to the supervising attorney immediately; they are not carried forward.

Per-jurisdiction trust rules: IOLTA rules in the United States are state-specific: minimum-balance thresholds for separate vs. pooled accounts, interest remittance schedules, and reporting obligations vary. EU bar associations maintain client account rules under national professional-conduct codes. OAB Brazil (Estatuto da OAB, Lei 8.906/1994, Art. 22 and Código de Ética Art. 50) requires separate management of client advances. Verify the operative rules at engagement inception; do not assume one jurisdiction's rules apply to another.

Expense Pass-Through

Cost vs. charge distinction: Pass-through expenses must represent actual third-party costs incurred on behalf of the client. The recoverable amount is the actual cost paid unless the fee agreement explicitly authorises a markup and specifies the markup rate.

Markup ethics: Charging above actual cost for photocopying, courier services, or computer-assisted research beyond what the fee agreement authorises is subject to Rule 1.5 reasonableness analysis and, in some jurisdictions, bar discipline. Disclose any markup in the fee agreement.

Receipt retention: Receipts or vendor invoices must be retained for all pass-through expenses above the firm's threshold (minimum: receipts for expenses above $25 USD-equivalent; recommended: all pass-throughs). Retention period: same as matter-close retention schedule.

Tax categorisation: Distinguish between costs the firm advances as agent (no revenue recognition; balance-sheet asset) and costs billed as firm charges (revenue at billing). Mis-categorisation creates accounting and tax-reporting errors. Coordinate with the bookkeeper-controller skill for treatment within the firm's chart of accounts.

Retainer Lifecycle

Retainer type definitions:

Depletion tracking: Replenishing and evergreen retainers require per-matter trust-ledger tracking with balance-alert rules set at the replenishment threshold. Invoices drawn against trust must simultaneously update the client ledger and the trust reconciliation.

Refund on termination: On matter close or client-initiated termination, any unearned retainer balance held in trust must be returned to the client promptly. Failure to return unearned funds is commingling and a Rule 1.15 violation.

Jurisdictional Compliance

Fee rules, billing guideline requirements, and trust account obligations are jurisdiction-specific. The following is a mapping of operative sources; verify current rules at engagement inception.

No rule in this skill supersedes the jurisdiction-specific operative rule. When rules conflict, apply the stricter obligation and document the conflict.

Anti-patterns

Cross-References

• core/compliance-lgpd — LGPD legal bases, data-subject rights, breach notification, and cross-border transfer mechanisms for client data processing; this skill inherits and specialises those controls.
• domains/legal/skills/client-intake — conflict-of-interest checks, engagement letter requirements, and client identity verification; precedes billing engagement.
• domains/finance-accounting/skills/bookkeeper-controller — chart-of-accounts treatment of retainer advances, cost pass-throughs, and revenue recognition; coordinate for accounting entries that mirror trust-account transactions.

ADR Anchors

• ADR-058 — two-pass review gate; applies to all billing deliverables (invoice review, trust reconciliation, fee agreement structure) before client transmission or matter-file lodgement.