Introduction
Of all the financial obligations that come with operating a law firm, trust accounting is among the most technically demanding — and the consequences of getting it wrong extend beyond the CRA. The Law Society of Ontario enforces trust account rules rigorously, and compliance failures can have professional as well as tax consequences.
This article focuses on the intersection of trust accounting obligations and CRA compliance for Ontario law firms.
What Is a Trust Account?
A lawyer's trust account holds client funds that have been received in advance of services being rendered, or funds held on behalf of a client in connection with a legal matter — such as real estate deposits, settlement proceeds, or judgment amounts.
These funds are not the law firm's income. They belong to clients and must be segregated from the firm's general accounts. The Law Society of Ontario requires that trust funds be held in a designated trust account at a financial institution, and that detailed records be maintained.
The key distinction for tax purposes: trust funds held on behalf of clients are not income to the law firm until they are properly drawn and earned — either applied to an outstanding account or transferred to the firm's general account following the completion of work.
The CRA's Interest in Trust Accounts
The CRA does not regulate trust accounts directly — that is the Law Society's role. However, the CRA is concerned with:
When income is recognised: Fees are income when they are earned. In many firm structures, amounts billed are included in income on an accrual basis — meaning income is recognised when the right to receive it arises, not necessarily when cash is received. Work in progress (WIP) treatment can vary depending on whether the firm uses the modified accrual basis available to professional partnerships.
Interest earned on mixed trust funds: Law firms that hold client funds in a pooled trust account may be required to participate in the Law Society Foundation's interest on lawyers' trust accounts (IOLTA) program, or to hold funds in interest-bearing accounts for large or long-term deposits. The interest on individually designated trust accounts generally belongs to the client and is not income to the firm. This should be clearly documented.
Fees drawn from trust: When funds are transferred from trust to the firm's general account as earned fees, those amounts become income and must be reported. Errors in the timing or documentation of this process can create discrepancies between trust records and reported income.
HST on Legal Services
Ontario law firms providing taxable legal services must charge and collect HST. The registration threshold is $30,000 in taxable supplies — but virtually all practising law firms will exceed this from their first year of operation.
Common complications include:
Disbursements: When a firm pays out-of-pocket expenses on behalf of a client and recovers those costs, the HST treatment depends on whether the firm is acting as agent or principal. The CRA's position on disbursements vs. expenses affects whether HST is applicable and whether an ITC can be claimed.
Real estate transactions: Transfers of funds in real estate matters may involve both HST-taxable and exempt components. Ensuring the invoice correctly separates legal fees (taxable) from disbursements and deposit transfers is important.
Legal aid and exempt services: Certain legal services may be exempt from HST. The firm's billing practices should reflect the correct HST treatment for each type of matter.
Bookkeeping for Law Firms
Law firm accounting requires maintaining two parallel sets of records: general accounts for the firm's own revenue and expenses, and trust accounts for client funds. These must be reconciled regularly. The Law Society of Ontario requires monthly trust reconciliations and imposes strict requirements on record retention.
Many firms use specialised legal accounting software (PCLaw, Clio, Cosmolex) that integrates trust and general ledger accounting. Regardless of the system, the underlying records must be accurate and retrievable.
Professional Corporation Considerations
Many lawyers in Ontario operate through professional corporations. The general corporate tax rules — T2 filing, salary vs. dividend compensation, shareholder loan rules — all apply. In addition, the professional corporation rules under the Law Society Act impose requirements on share ownership and the nature of permitted shareholders.
Fees earned through a professional corporation must be flowed through appropriately, with proper documentation of when earned income is allocated to the corporation vs. the individual lawyer.
When to Speak With a CPA
Law firms — whether operating as sole practices, partnerships, or professional corporations — benefit from working with a CPA who understands legal practice structures, trust accounting obligations, and the CRA's expectations for professional service firms. A compliance error in trust accounting carries dual risk: regulatory exposure with the Law Society and potential tax consequences with the CRA.