Legal billing is the process a law firm uses to record work and expenses, apply the client’s fee agreement, review charges, issue invoices, and collect payment. A reliable billing workflow connects accurate timekeeping with clear invoices, client billing rules, trust-account controls, and follow-up.

How does a law firm billing workflow work?

A law firm billing workflow moves each charge from contemporaneous time entry through review, invoice delivery, and payment reconciliation. Assign an owner and deadline to each stage so work does not sit unbilled.

1. Record work promptly. Enter the date, matter, task, time, and a clear description as soon as practical after the work.
2. Capture expenses. Record reimbursable costs against the correct matter and retain receipts or supporting documents.
3. Review entries. Check the client agreement, rates, task codes, budgets, block-billing restrictions, and duplicate or vague entries.
4. Prepare and approve the bill. Generate a draft invoice, have the responsible lawyer review it, and resolve exceptions before release.
5. Send the invoice in the required format. Deliver it through the client’s portal or other agreed channel, with matter identifiers and supporting detail.
6. Post receipts and reconcile. Apply payments, follow up on overdue balances, and reconcile trust activity separately under the rules that apply to the firm.

Which legal fee arrangement should a firm use?

The fee arrangement should match the work, client expectations, jurisdiction rules, and the firm’s ability to estimate scope. Explain the arrangement in a written engagement agreement and follow applicable professional-conduct rules.

• Hourly fees: The client pays for recorded time at agreed rates. They suit work where scope or duration is uncertain.
• Flat fees: The client pays an agreed amount for a defined service or phase. State what is included and how out-of-scope work is handled.
• Contingency fees: The lawyer receives an agreed portion of a recovery where permitted. The written agreement should explain the calculation and responsibility for costs.
• Retainers: “Retainer” can mean an advance deposit, a fee for availability, or another agreed arrangement. Define what the payment covers and how any client funds are handled.
• Hybrid fees: A matter may combine a fixed component, hourly work, or a success-based component when permitted and clearly documented.

How do billing increments and time entries work?

A billing increment is the smallest unit used to record billable time; in a tenth-hour system, 0.1 hour equals six minutes. The agreement and client guidelines control how time is captured, rounded, and described. Do not round entries in a way that overstates work or conflicts with applicable rules.

Use specific, accurate descriptions that identify the task and its purpose, such as “Review opposing counsel’s amended discovery responses and flag missing production.” Avoid vague entries such as “Attention to file.” Separate distinct tasks when required by the client or billing system.

What should a pre-bill review check?

A pre-bill review checks whether every charge is accurate, authorized, understandable, and compliant with the engagement agreement and client billing rules. Review these items before an invoice is sent:

• Correct client, matter number, billing period, rates, and responsible timekeeper.
• Complete, contemporaneous entries with task descriptions that explain the work.
• No duplicate time, unsupported expenses, prohibited administrative charges, or unapproved rate changes.
• Required task and activity codes, budgets, phase limits, and invoice format.
• Consistent narrative, readable layout, and required receipts or attachments.
• Trust funds and operating receipts recorded in the correct accounts with separate reconciliation controls.

How do legal billing guidelines and e-billing work?

Legal billing guidelines set the client’s rules for rates, task descriptions, time increments, expenses, budgets, invoice timing, and submission. E-billing software applies those rules to electronic invoices, routes them for review, and returns status or rejection information.

Before accepting a matter, identify who supplies the guidelines and where the current version is stored. Configure the billing system to flag rules such as block-billing limits, required task codes, rate caps, expense restrictions, and submission deadlines. A flag is a review prompt; the lawyer or billing lead remains responsible for resolving disputed or unusual charges.

What is LEDES formatting?

LEDES is a set of electronic invoice data formats used by some legal departments and e-billing platforms. Confirm the client’s required LEDES version, task and activity codes, tax fields, matter identifiers, and portal rules before submitting. Missing identifiers, invalid codes, mismatched rates, and unsupported expenses are common reasons to investigate when an invoice is rejected.

Which legal billing software should a firm consider?

Choose billing software based on the firm’s size, practice workflow, trust-account needs, client e-billing requirements, integrations, and reporting—not a feature checklist alone. Confirm current plan details and integrations directly with each vendor before buying.

• Small and midsize firms: Clio, MyCase, and PracticePanther combine matter management with time capture, invoicing, and payment workflows; compare trust-account support and the tools the team already uses.
• Firms wanting billing and accounting together: CosmoLex markets a combined practice-management and legal-accounting workflow. Verify that its controls fit the firm’s jurisdiction and bookkeeping process.
• Large firms and corporate legal departments: Enterprise billing and e-billing platforms such as Legal Tracker, Brightflag, or enterprise practice-management suites may better fit complex guidelines, LEDES submissions, budgets, and approval chains.

A product’s support for a feature does not by itself establish compliance. Ask for a workflow demonstration using a realistic matter, verify access controls and audit records, and have the firm’s accounting or compliance lead review trust handling.

How should law firms manage trust money in billing?

Keep client trust funds separate from firm operating money, record every receipt and disbursement, and reconcile the trust account using the controls required by the firm’s jurisdiction. Billing software can assist with ledgers and reports, but it cannot replace lawyer oversight or state-specific accounting rules. Check your state bar’s current trust-account rules and consult qualified accounting support when needed.

How can a firm reduce rejected invoices and late payments?

Firms can reduce billing delays by capturing time promptly, checking client rules before submission, correcting portal errors quickly, and assigning clear ownership for collections.

• Keep each client’s current guidelines, rates, matter IDs, and portal instructions in one maintained reference.
• Run pre-bill checks for missing detail, task codes, budget exceptions, duplicate entries, and expenses.
• Submit invoices on a regular schedule and track acceptance, rejection, and payment dates.
• Resolve rejected items with a named owner and documented correction deadline.
• Review aging receivables and follow up consistently, respectfully, and in line with the engagement terms.

When should a firm outsource billing support?

Outsourced billing support can help when time entry, invoice preparation, e-billing submissions, or receivables follow-up repeatedly delay attorney work or cash collection. Define the delegated tasks, access permissions, review checkpoints, and escalation rules first. A billing specialist can prepare and route records; the firm should retain control of fee decisions, trust approvals, client disputes, and final oversight. Explore Aristo Law’s virtual legal billing specialist service for role-specific support.

Sources and further reading

• Clio: Law firm billing
• Onit: The basics of billing guidelines
• Brightflag: Guide to legal billing and checklist