Invoice Template for Solo Practice Lawyers: Formats, Rules, and How-To
Free invoice templates for solo attorneys — hourly, flat fee, retainer, and contingency — plus IOLTA rules, payment terms, and business checking guidance.
You bill by the tenth of an hour, hold client money you can't touch, and get paid on somebody else's cash flow. A solo law practice invoice should reflect trust-account rules, match the fee structure in your engagement letter, and give clients enough detail to pay without confusion.
Below are copy-ready invoice templates for hourly, flat-fee, contingency, and retainer billing, plus the IOLTA rules and banking setup solo practices need to manage them.
What should a solo practice lawyer's invoice include?
A legal invoice is a professional document and, in some states, part of your ethics compliance record. At minimum, every invoice should list:
- Your firm identity. Attorney name, registered firm name (matching your bar registration), address, phone, email, and state bar number where required.
- Client and matter identifiers. Client name and a matter or case reference number so the invoice ties to a specific representation.
- Itemized time entries. Date, task description, hours in 0.1-hour increments, hourly rate, and line total. Contemporaneous timekeeping with specific task descriptions is easier to defend than block-billed lumps like "Various matter work (4.0 hrs)."
- Expenses and disbursements listed separately. Filing fees, court costs, service of process, expert witness fees, and courier charges belong in their own section, not mixed into legal fees.
- Trust account activity when applicable. If the invoice draws against a retainer, show the starting trust balance, the draw for this invoice, and the remaining balance.
- Payment terms and methods. Due date, accepted payment methods (ACH, check, card), and any interest or late fee your state bar permits.
An invoice template for solo practice lawyers should include firm information, client and matter identifiers, itemized time entries, separate expense lines, trust account activity when applicable, and clear payment terms.
Copy-ready hourly invoice template
[LAW FIRM NAME] INVOICE
[Attorney Name, Esq.] | State Bar #: [######]
[Street Address] Invoice #: 2025-0142
[City, State ZIP] Invoice Date: [MM/DD/YYYY]
[Phone] | [Email] Due Date: [MM/DD/YYYY]
BILL TO: MATTER:
[Client Name] Matter #: [YYYY-###]
[Client Address] Re: [Brief Matter Description]
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PROFESSIONAL SERVICES
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DATE DESCRIPTION HOURS RATE AMOUNT
MM/DD Draft and revise complaint; review 2.4 $350 $ 840.00
supporting exhibits provided by client
MM/DD Telephone conference with opposing 0.6 $350 $ 210.00
counsel re: extension of time to answer
MM/DD Legal research on statute of 1.8 $350 $ 630.00
limitations issue; draft memo to file
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Fees Subtotal 4.8 $1,680.00
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COSTS AND DISBURSEMENTS
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MM/DD Court filing fee: Superior Court $ 435.00
MM/DD Certified mail service of process $ 28.50
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Costs Subtotal $ 463.50
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TRUST ACCOUNT ACTIVITY (if applicable)
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Beginning trust balance: $5,000.00
Less: this invoice (fees + costs) -$2,143.50
Ending trust balance: $2,857.50
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TOTAL DUE $2,143.50
(Drawn from retainer; no payment required)
Payment methods: ACH (preferred) | Check payable to [Firm Name] | Card
Questions on this invoice? Contact [name/email] within 14 days.Tip: Use the block above as a starting point in Google Sheets or Excel, then add formulas for the fees subtotal, costs subtotal, ending trust balance, and total due. Save a Word version for clients who want a document rather than a PDF.
Where can solo attorneys get a free invoice template (hourly, flat fee, contingency, retainer)?
Four templates cover almost every billing situation in a solo practice.
1. Hourly billing template
Use for litigation, ongoing counsel, and any matter where you can't predict the scope. The template above is the base. Many solo attorneys bill hourly work in 0.1-hour (six-minute) increments, and client-facing task descriptions should be written in plain English.
2. Flat-fee invoice template
Use for defined-scope work: LLC formation, simple wills, uncontested divorces, trademark filings, real estate closings.
DESCRIPTION AMOUNT
Flat fee: Preparation and filing of Articles of Organization, $ 950.00
operating agreement, EIN application, and initial resolutions
(Delaware LLC, as described in engagement letter dated MM/DD)
Delaware Division of Corporations filing fee $ 90.00
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TOTAL DUE $1,040.00
Payment due on receipt.3. Retainer replenishment invoice
When a retainer draws below an agreed floor (say, $1,000), this invoice asks the client to top it back up.
Beginning trust balance: $ 875.00
Retainer replenishment requested +$4,125.00
Target trust balance after replenishment: $5,000.00
Please remit $4,125.00 within 10 days to restore the retainer per
Section 4 of the engagement letter.4. Contingency-fee settlement statement
Many states require written closing or settlement statements for contingency-fee matters; check your state's professional conduct rules before disbursing settlement funds.
CONTINGENCY-FEE SETTLEMENT STATEMENT: Matter #2025-088
Gross settlement recovery $75,000.00
Less: attorney's fee (33.3% per engagement agreement) - $24,975.00
Less: costs advanced by firm
Medical records $ 415.00
Filing fees $ 620.00
Expert report (Dr. Chen) $2,800.00
Deposition transcripts $1,145.00
Costs total - $4,980.00
Less: outstanding medical liens
[Hospital name] $8,200.00
[Provider name] $1,300.00
Liens total - $9,500.00
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NET RECOVERY TO CLIENT $35,545.00
Client signature: ___________________________ Date: ____________
Attorney signature: _________________________ Date: ____________Tip: Any of these blocks can be pasted into Google Sheets or Excel and wired up with formulas so subtotals and totals update as you edit line items. Save a copy as a Word template for clients who prefer a document to a PDF.
How do you bill clients as a solo lawyer, step by step?
Consistent billing habits make invoices easier for clients to understand and easier for you to follow up on.
1. Lock the fee structure in the engagement letter, before you work
The engagement letter should state hourly rates, flat fees, retainer amount and replenishment trigger, contingency percentage and cost handling, billing cadence, and consequences of nonpayment. Most fee disputes start with a client who didn't understand what they signed.
2. Capture time contemporaneously
Track time as you do the work, not from memory at month-end. A three-day-old time entry is a guess. Use a timer in your practice-management tool or a simple running note on the matter. Contemporaneous timekeeping is easier to defend in fee disputes than reconstructing time from memory at month-end.
3. Write task descriptions in plain English
The client sees these. Skip UTBMS billing codes (L120, A103) on the client-facing invoice unless the client is insurance-industry and requires them. "Reviewed and revised employment agreement; three redline rounds with opposing counsel" reads better than "Legal work re: matter, 3.2 hrs."
4. Reconcile the trust account before invoicing against it
Never issue an invoice that draws from a retainer without confirming the trust ledger matches the bank statement and the client's individual sub-ledger. Three-way reconciliation is the standard.
5. Send invoices on a fixed monthly cadence
Bill on the same day every month, the 1st or the 15th. Clients budget better and pay faster when invoices are predictable. Flat-fee invoices go out at engagement (deposit) and at completion (balance).
6. Follow up on aging balances at 30, 60, and 90 days
- Day 30: Friendly reminder email with the invoice reattached.
- Day 60: Direct email or call. Restate the terms in the engagement letter.
- Day 90: Letter referencing the withdrawal or fee-arbitration procedures in your engagement letter. Document every contact.
How should solo lawyers handle trust accounting and IOLTA?
IOLTA (Interest on Lawyers' Trust Accounts) is the separate bank account where you hold client money that isn't yet yours. Retainers not yet earned, settlement funds waiting to be disbursed, and filing fee advances all live in IOLTA until you've done the work and invoiced against it.
The core rules
- Do not commingle funds. Client funds and your operating funds never share an account. Not for a day, not for "I'll move it Monday."
- Remit interest to legal aid. Interest on pooled IOLTA accounts is remitted to state-designated programs that fund civil legal aid, not to the attorney or client. Specific rules vary by state.
- Reconcile accounts three ways, monthly. Bank statement, trust account ledger, and each client's individual ledger must all match. Same balance, same date, every month.
- Invoice before drawing from trust. Perform the work, issue the invoice, then transfer the earned amount from IOLTA to operating. Not before.
Three trust-accounting mistakes that get solos disciplined
- Commingling. Depositing an earned fee into IOLTA "for safekeeping," or leaving your own money in IOLTA to cover bank fees when state bar rules require a specific method.
- Billing against a retainer before invoicing the client. Moving money out of IOLTA on the day you did the work, before you've generated and sent the invoice, is a common bar complaint.
- Skipping monthly three-way reconciliation. When bar auditors show up, they ask for reconciliation reports. Missing months are red flags.
What payment methods and terms help law firms get paid faster?
The mechanics of accepting payment matter more than most solos realize.
ACH vs. card: the cost math
On a $5,000 retainer invoice, an ACH transfer costs a few cents. The same invoice paid by credit card at a common 2.9% + $0.30 online rate costs about $145. Card rates vary by processor, but over a year of retainer replenishments, that's real money.
- Push ACH as the default. Put "ACH preferred" on every invoice and list card as an option, not the lead.
- Accept cards for smaller flat-fee work. For a $500 consultation or a $950 LLC formation, card convenience often wins and the fee is tolerable.
- Use an IOLTA-compliant processor for trust deposits. If a client wants to pay a retainer by card, the processor must route processing fees to your operating account, never debit them from trust. Otherwise you've caused a commingling violation.
Payment terms
- Net 15 for ongoing hourly matters with established clients.
- Net 30 for corporate clients who require it. Many won't process AP faster.
- Payment on receipt for flat-fee work, with the deposit collected before you start.
Late fees and interest
State bar rules govern whether and how you can charge interest or late fees on overdue client invoices, and some states restrict or cap these charges. Some states require specific engagement-letter disclosures. Check your state's Rules of Professional Conduct before you print "1.5% monthly interest" on your template.
Automate what you can
Recurring monthly retainer invoices, payment reminders at 30/60/90 days, and card-on-file for known clients cut collection time. If your checking platform sends invoices, use that flow so paid/unpaid status sits next to your operating balance.
What should solo lawyers look for in a business checking account?
The operating account is where fees you've earned go, where you pay yourself, and where you cover overhead. It's separate from your IOLTA account by rule. What matters in an operating account for a solo:
- No monthly fee, no minimum balance. A $15 monthly fee costs $180 a year that could stay in operating cash.
- Built-in invoicing. Sending invoices from the same dashboard as your checking balance means you see paid/unpaid without switching tools.
- QuickBooks integration. Categorized income and expenses save your bookkeeper (or you, at tax time) hours per month.
- Sub-accounts or reserves. Set aside quarterly estimated taxes and reimbursable filing fees before you accidentally spend them.
- A clean line between operating and trust. Your business checking is the operating account. Client trust funds sit at a bar-approved IOLTA institution, often a separate bank.
For a deeper comparison of what solo attorneys should look for, see our guide to the best bank for solo practice lawyers.
How does Novo help solo law practices manage invoicing and cash flow?
Novo is a business checking platform built for small businesses like solo law practices. Novo supports the operating side of a solo practice without adding overhead.
- No monthly fees, no minimum balance. Novo business checking has a $0 monthly fee and no minimum balance requirement, so a solo practice keeps more of every billable hour.
- Invoicing from your checking dashboard. Solo attorneys can send invoices directly from Novo, accept card and bank payments, and view paid or unpaid status alongside their checking balance without a separate invoicing tool.
- Integrations with the software you already use. Novo integrates with QuickBooks for bookkeeping and with Stripe and Shopify for practices that also collect payments through those platforms.
- Novo Reserves for tax and cost segregation. Novo Reserves lets business checking customers split their checking balance into up to 20 named sub-accounts for categories such as quarterly estimated taxes, payroll, and reimbursable filing fees.
The scope note that matters
Novo serves as the operating account for a solo law practice and does not offer IOLTA trust accounts. Client trust funds should be held at a bar-approved IOLTA institution as required by ABA Model Rule 1.15, and many solo attorneys pair Novo with a separate IOLTA account. That split aligns with state bar rules and keeps operating funds strictly separated from client money.
Also worth knowing: Novo does not accept cash deposits. Solo law practices that receive payments by check, ACH, or card may use Novo for operating-account workflows, while practices that receive cash need another deposit method.
Novo is the operating-account and general-invoicing layer, not a replacement for legal practice management software if you need full matter management, conflicts checking, and document assembly. For the deduction side of the ledger, see our guide to solo practice lawyer business expenses and tax deductions.
Frequently asked questions
What should a solo lawyer's invoice include?
Firm name and bar registration, client name and matter number, itemized time entries in 0.1-hour increments with plain-English descriptions, separate listings for expenses and disbursements, trust account activity when applicable, and payment terms including due date and accepted methods.
Can solo lawyers charge interest on unpaid invoices?
Sometimes. State bar rules govern whether and how a lawyer may charge interest or late fees on overdue client invoices, and some states restrict or cap these charges. Most states require that interest terms be disclosed in the engagement letter before work begins. Check your state's Rules of Professional Conduct.
What's the difference between a retainer and a flat fee?
A retainer is client money deposited into your trust (IOLTA) account, from which you draw as you earn it by performing work and issuing invoices. A flat fee is a fixed price for a defined scope of work — for example, $950 for LLC formation. Some states allow flat fees to be deposited directly to operating; others require them to sit in trust until earned. Check your state's rule.
What's the best business bank account for a solo lawyer?
Look for zero monthly fees, no minimum balance, invoicing built into the checking dashboard, QuickBooks integration, and sub-account or reserve features for setting aside taxes. Novo fits this profile for the operating side of a solo practice; client trust funds belong at a separate bar-approved IOLTA institution.
Can I send legal invoices directly from my business checking account?
With Novo, yes. Solo attorneys can send invoices directly from Novo, accept card and bank payments, and view paid or unpaid status alongside their checking balance. Many traditional business checking accounts separate banking from invoicing, so solo lawyers may need a separate tool to create invoices and track payment status.
How often should a solo attorney send invoices?
Monthly is standard for hourly matters. Pick a fixed day (the 1st or the 15th) and hold to it. Flat-fee invoices go out at engagement (deposit) and at completion (balance). Retainer replenishment invoices go out when the trust balance drops below the floor set in the engagement letter.
Disclosures
Novo Platform Inc. ("Novo") is a fintech, not a bank. Banking services provided by Middlesex Federal Savings, F.A., Member FDIC. The Novo Debit Card is issued by Middlesex Federal Savings, F.A., and the Novo Business Credit Card is issued by Continental Bank, pursuant to licenses from Mastercard International Incorporated. Mastercard is a registered trademark of Mastercard International Incorporated and can be used everywhere Mastercard is accepted. The Novo Merchant Cash Advance is offered by Novo Funding LLC. Your eligibility for Novo products and services is subject to final Novo determination.
Novo Reserves is a feature of the Novo business checking account that allows customers to allocate funds into sub-accounts within their existing checking balance. Reserves are not separate accounts and do not earn interest.
This page is for informational purposes only and does not constitute legal, tax, financial, or accounting advice. Consult a licensed attorney, tax professional, or your state bar for guidance specific to your practice and jurisdiction. State bar rules on trust accounting, fee arrangements, invoicing, and interest on overdue balances vary; always confirm current requirements with your state's Rules of Professional Conduct.