Quick Answer
Law firms face accounting requirements unlike any other business: trust accounts, disbursements, Law Society reporting, HST on legal fees, and complex partnership structures. Improper management of trust funds can result in disbarment. This guide explains the unique accounting obligations every Canadian lawyer must understand.
Trust Accounts: The Most Critical Obligation
A trust account holds client funds that belong to the client — not to the law firm. Examples include: retainer deposits, settlement funds held pending disbursement, real estate transaction funds, and court-ordered payments. Trust funds must be kept completely separate from the firm's operating account. Mixing trust and general funds ("misappropriation") is one of the most serious violations of Law Society rules and can result in immediate suspension.
- Maintain a separate trust bank account — Never use it for firm expenses
- Record every deposit and withdrawal immediately with the client file number
- Reconcile trust accounts monthly (or more frequently)
- Do not earn interest for the firm on trust funds (unclaimed funds go to Law Foundation)
- Provide trust account statements to clients upon request
- Report trust account reconciliation to your Law Society annually
Disbursements vs Legal Fees
Disbursements are out-of-pocket expenses the firm incurs on behalf of a client: court filing fees, process server fees, expert witness fees, photocopying, courier costs. Disbursements are recharged to clients — they are not firm income. Legal fees are what you charge for professional time. On invoices, these must be clearly separated for HST purposes.
HST on Legal Fees
Most legal services are fully taxable for HST purposes. You must charge 13% HST (in Ontario) on legal fees and most disbursements once your firm's annual billings exceed $30,000. Once registered, you collect HST on behalf of the CRA and remit it quarterly or annually, after deducting Input Tax Credits (ITCs) for HST paid on the firm's expenses.
Law Firm Structures and Taxes
- Sole Practitioner — Files a T1 with T2125; all income is personal income
- Partnership — Each partner files personal T1; partnership files a T5013 information return
- Professional Corporation (PC) — Files a T2 corporate return; salary/dividends to lawyer-shareholders
- Limited Liability Partnership (LLP) — Common for larger firms; complex tax reporting
Professional Corporation Benefits for Lawyers
Most provincial Law Societies now allow lawyers to incorporate. A Professional Corporation can significantly reduce tax when the lawyer earns more than they personally need to spend. The small business deduction reduces the corporate tax rate to approximately 12.2% on the first $500,000 of active income — versus 46–53% personal marginal rates. See our corporate tax guide for details.
Law Society Financial Compliance Requirements
- Annual Trust Reconciliation Report — Filed with Law Society of Ontario or your province
- Professional Liability Insurance — Annual renewal
- Annual Financial Statement (some Law Societies) — Summary of trust and general account activity
- Spot Audits — Law Society may audit trust accounts at any time; records must be instantly accessible
Recommended Accounting Software for Law Firms
- PCLaw — Designed specifically for Canadian law firms; handles trust, billings, and disbursements
- Clio — Modern cloud platform with trust accounting and Law Society compliance features
- QuickBooks + Clio — Common combination for firms wanting flexible accounting with legal practice management
- Cosmolex — All-in-one legal accounting with built-in trust accounting
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Accounting for Law Firms