Trust Accounting for Law Firms in Ontario: What Every Lawyer's Accountant Should Know
Law firm bookkeeping is not the same job as bookkeeping for a typical small business, and it is not optional to treat it that way. Ontario lawyers who hold client funds are governed by the Law Society of Ontario's By-Law 9, and the trust accounting rules underneath it are strict, specific, and actively audited. A bookkeeper who does not understand them is a real liability, not just an inconvenience.
Mixed Trust Accounts: The Basics
Most law firms hold client funds, retainers, settlement proceeds, real estate deposits, in a mixed trust account: one account holding money for many different clients at once. That account must be kept entirely separate from the firm's general or operating account. Trust funds are never used to cover operating expenses, payroll, or anything else belonging to the firm, even temporarily, even by accident.
Where the Interest Goes
Interest earned on a mixed trust account does not belong to the firm and does not belong to the client. It is remitted to the Law Foundation of Ontario, which uses it to fund legal aid and access-to-justice programs across the province. If a particular client's funds are large enough or held long enough to justify it, the firm can open a separate interest-bearing trust account for that one matter, in which case the interest is paid to the client instead.
Monthly Reconciliation Is Not Optional
Trust accounts must be reconciled monthly: the trust ledger, the client sub-ledgers, and the bank statement all need to match, to the penny. This is one of the most common points of failure we see when we take over books from a previous bookkeeper who did not have law firm experience. A reconciliation that is "close enough" is a serious problem in trust accounting in a way it simply is not for a general operating account.
The LSO Can Audit Without Notice
The Law Society conducts spot audits of trust accounts, and firms do not get advance warning. Poor trust records are one of the most common findings that lead to a licensing issue, independent of whether any money actually went missing. Clean, current, properly reconciled trust records are the single best protection a firm has if an audit happens.
The General Account Side Still Needs Real Accounting
Trust compliance gets the attention, but the firm's own operating side still needs proper bookkeeping and, if the firm operates through a Professional Corporation, a correctly filed T2. Partnership structures, associate lawyer compensation, and the split between a lawyer's personal and corporate returns all carry the same complexity we see with other incorporated professionals, on top of the trust accounting layer.
What to Look For in a Bookkeeper
- Direct experience with mixed trust accounts, not just general small business bookkeeping
- A monthly reconciliation process for trust separate from the general ledger
- Familiarity with By-Law 9 recordkeeping requirements
- Comfort working alongside your firm's own annual filing obligations to the Law Society