Attorney Invoice Template: Legal Billing Best Practices
Legal billing has its own language — matter numbers, timekeepers, 0.1-hour increments, and IOLTA trust accounting. Here's everything attorneys and solo practitioners need to bill correctly and get paid faster.
Legal Billing Formats
Hourly Billing (6-Minute Increments)
The most common billing method in law. Time is recorded in 0.1-hour (6-minute) increments. Each activity — a phone call, reviewing a document, drafting an email — gets its own time entry.
| Time Spent | Billed As | At $400/hr |
|---|---|---|
| 5 min | 0.1 hrs | $40 |
| 15 min | 0.3 hrs | $120 |
| 30 min | 0.5 hrs | $200 |
| 45 min | 0.8 hrs | $320 |
| 1 hr | 1.0 hrs | $400 |
Flat Fee Billing
Common for wills, incorporations, simple contracts, and routine filings. Client knows the exact cost upfront. Invoice on completion or 50% upfront / 50% on delivery.
Contingency Billing
No invoice until settlement or judgment. You take a percentage of the recovery (typically 25–40%). The invoice is issued at settlement, showing gross recovery, your percentage, and expenses advanced.
Retainer Billing
Client pays an advance deposit into your IOLTA trust account. You bill against the retainer as work is performed. The invoice shows hours worked, amount applied from trust, and remaining trust balance.
Attorney IOLTA Requirements
⚖️ Trust Accounting — Handle with Care
Client funds held in trust must be kept in an IOLTA account, completely separate from your operating funds. Commingling trust funds with your own money is a serious ethics violation that can result in disbarment.
- ✓ Retainer goes INTO trust account — not your operating account
- ✓ Transfer from trust to operating ONLY after earning the fee
- ✓ Your invoice documents each transfer out of trust
- ✓ Send client a monthly trust account statement
- ✓ Bar association rules vary by state — check your local rules
Each billing statement should show opening trust balance, work performed this period (with time entries), amount applied from trust, and closing trust balance.
What Goes on a Legal Invoice
Ethical Billing Rules for Attorneys
❌ No Double Billing
If you're on a train traveling for Client A, you can't bill Client B for work done during that travel. You can split the travel cost 50/50, but you can't charge full rates to both clients for the same time.
⚠️ Block Billing (Discouraged)
Lumping multiple tasks into one time entry: “Research, phone call, letter — 3.5 hours.” Courts and clients increasingly object to this. Itemize each task separately.
❌ No Padding Hours
Billing more time than actually spent is fraud. It can result in disbarment, criminal charges, and restitution orders. AI tools now detect billing anomalies in corporate legal departments. Don't do it.
✓ Write Specific Descriptions
“Research” is not a description. “Research case law on implied warranty claims under UCC 2-314, review of three circuit court decisions” is a description. Be specific.
📋 A Note on Legal Practice Management Software
Law firms typically use dedicated practice management software (Clio, MyCase, PracticePanther) that handles trust accounting, matter management, time tracking, and billing in one system.
For solo attorneys, legal consultants, or boutique firms that need a simpler invoicing and payment-chasing solution without the full overhead, Chaser works well.
Free Attorney Invoice Template →
Professional invoice template with matter number, timekeeper fields, and automated payment reminders.
Use Free TemplateFrequently Asked Questions
Do I need to bill in 0.1-hour increments?
It's standard in most jurisdictions, especially for litigation. Some attorneys use 0.25-hour (15-minute) increments for transactional work. Check your bar association's guidelines and what your retainer agreement specifies.
Can I charge interest on overdue attorney invoices?
Yes, if you disclosed this in your fee agreement. Most attorneys include a late payment provision of 1.5% per month (18% annually). This must be agreed upfront — you can't retroactively add interest terms.
How quickly should I send invoices?
Best practice is monthly billing for ongoing matters. For transactional work (closings, settlements), bill within 5 business days. Delay = disputes, as clients' memory of the work fades.
What if a client disputes my invoice?
Respond in writing and provide time records supporting each entry. If still disputed, most bar associations have a fee arbitration process. Never threaten to take adverse action as leverage — that can be an ethics violation.
Can paralegals bill at their own rate?
Yes. Paralegal time is recoverable in most jurisdictions. Show the paralegal's name, title, and hourly rate separately from attorney time.
Stop Chasing Overdue Legal Invoices Manually
4-stage escalation, professional templates, no more awkward calls.