How to Invoice as a Lawyer
A practical checklist for Lawyers who want invoices that match how lawyer work actually gets sold and delivered.
Legal billing carries unique requirements around trust accounting, retainer management, and ethical fee disclosures that most other professions do not face. Invoices must clearly separate earned fees from costs advanced on behalf of the client, and many jurisdictions require specific billing practices for funds held in IOLTA trust accounts. Getting these details wrong can trigger ethics complaints, bar disciplinary action, and malpractice exposure.
Most attorneys bill in six-minute increments, and your invoices should show each time entry with the date, task description, timekeeper, and duration. Clients who receive detailed time narratives are more likely to pay promptly because they can verify the work against their understanding of the case. Vague entries like "legal research" or "review documents" invite write-downs, disputes, and damaged client relationships.
For firms handling insurance defense, corporate litigation, or government work, outside counsel billing guidelines dictate invoice format, task codes, rate caps, and submission deadlines. Non-compliance results in automatic rejection from e-billing systems, delaying payment by weeks or months. Building LEDES and UTBMS compatibility into your invoicing workflow from day one prevents these costly rejections.
Retainer-based billing adds another layer of complexity. Your invoices must show the opening trust balance, fees applied against the retainer, costs advanced, and the closing balance. When the retainer drops below the agreed replenishment threshold, a prompt invoice requesting additional funds keeps your cash flow uninterrupted and avoids pausing work mid-matter.
Step-by-step invoicing guide
Follow these steps to keep every invoice clear, professional, and easy for clients to approve.
- 1
Record time in six-minute increments with detailed narratives
Each entry should include the date, task performed, timekeeper name, and time spent. Vague descriptions like "research" invite disputes and write-downs. Specific narratives such as "researched state statute on spoliation sanctions for pending motion" justify the charge and demonstrate value to the client.
- 2
Separate attorney fees from costs and disbursements
Filing fees, court reporter charges, expert witness costs, deposition transcripts, and other disbursements must appear as distinct items separate from your legal fees. Many bar associations require this separation for ethical compliance, and clients expect to see exactly where their money goes.
- 3
Replenish retainer invoices when the trust balance drops
When the retainer balance falls below the agreed threshold, send a replenishment invoice immediately. Reference the retainer agreement terms, show the current trust balance, and specify the amount needed to restore the fund. Prompt replenishment prevents work interruptions and maintains steady cash flow.
- 4
Include matter name and number on every invoice
Corporate clients, insurance carriers, and government agencies route invoices by matter number. Missing this detail causes automatic rejection by their billing departments or e-billing systems. Always include the client matter reference, your internal file number, and the billing period covered.
- 5
Apply billing guidelines for insurance defense and corporate clients
Many institutional clients have outside counsel guidelines dictating billing format, task codes, rate caps, and submission deadlines. Invoice in their required format using LEDES or UTBMS codes to avoid rejection. Review these guidelines annually since clients update them frequently.
- 6
Run pre-bills through partner review before finalizing
Draft invoices should be reviewed by the responsible partner for accuracy, appropriate write-downs, and narrative quality before reaching the client. Pre-bill review catches errors, reduces client complaints, and ensures the firm presents a polished and defensible billing record.
- 7
Send invoices on a consistent monthly schedule
Establish a fixed monthly billing cycle and send invoices within the same window each month. Consistent timing helps clients budget for legal expenses, reduces payment delays, and prevents months of unbilled time from accumulating into large surprise invoices that strain the client relationship.
Tips for lawyer invoicing
- Use LEDES or UTBMS task codes when required by corporate and insurance clients to ensure invoices pass through their e-billing systems without rejection.
- Send pre-bills to partners for review before finalizing invoices so time entries are accurate and write-downs are applied before the client sees the bill.
- When retainer funds are insufficient to cover the current invoice, clearly show what was applied from trust and what remains as a balance due.
- For contingency fee cases, track all costs advanced and include a running total on each invoice so the client knows their potential obligation.
- Include the timekeeper name and rate on each line item for matters with multiple attorneys to show which team member performed each task.
- Set up automatic payment reminders at 30, 60, and 90 days for outstanding balances to reduce collections follow-up and maintain professional relationships.
- For flat-fee matters, break the project into milestone invoices rather than billing everything at completion so both sides track progress.
- Track realization rates per matter type to identify which practice areas have the healthiest billing-to-collection ratios and adjust pricing accordingly.
Common invoicing mistakes to avoid
- Using vague time descriptions like legal research without specifying the issue researched, which clients cannot verify and often dispute.
- Commingling earned fees with trust account funds on invoices, creating ethical and accounting compliance issues that can trigger bar complaints.
- Not following outside counsel billing guidelines, causing invoice rejection by corporate and insurance clients and delaying payment by weeks.
- Failing to send retainer replenishment invoices promptly, running out of trust funds before the next billing cycle and halting work mid-matter.
- Billing multiple matters on a single invoice rather than issuing separate invoices per matter, which prevents clients from routing charges correctly.
- Letting months of unbilled time accumulate before invoicing, resulting in large surprise bills that damage client trust and reduce collection rates.
How Billed supports your workflow
Built for professionals who want polished invoices without the busywork.
Six-Minute Time Tracking
Record billable time in standard legal increments with date, task narrative, timekeeper name, billing rate, and duration fields. Each entry links to a matter for organized billing and supports multiple timekeepers on the same invoice for full team visibility.
Trust Account Separation
Show retainer applications, opening and closing trust balances, and earned fees as separate sections for ethical compliance. Automatically calculate the remaining trust balance after each invoice so both you and the client can track fund usage in real time.
LEDES Billing Support
Generate invoices in LEDES format with UTBMS task and activity codes for corporate and insurance client e-billing systems. Pre-configure code sets per client so your team selects the correct codes during time entry rather than mapping them after the fact.
Matter-Based Invoicing
Organize invoices by matter name and number so institutional clients can route them through their billing departments automatically. Link all time entries, expenses, and disbursements to specific matters for clean separation across multiple active engagements.
Pre-Bill Review Workflow
Route draft invoices through partner review before finalizing and sending to clients. Track write-downs, narrative edits, and approval status so billing coordinators can manage the pre-bill cycle efficiently across dozens of active matters each month.
Disbursement Tracking
Log filing fees, court reporter charges, expert witness costs, travel expenses, and other disbursements per matter. Pass them through as itemized reimbursable expenses with receipt documentation so clients can verify every advanced cost on the invoice.
Related Resources
Frequently asked questions
More Invoicing Guides
Start Invoicing as a Lawyer
Join professionals who use Billed to invoice faster, track payments, and stay organized—starting free.
No credit card required. Cancel anytime.