B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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104. A lawyer who practises in a firm must ensure that the firm uses separate accounting and billing for the fees and costs of professional services rendered by each lawyer. The invoice or statement of fees must describe the professional services rendered by each lawyer, except where a lump-sum payment has been agreed upon in writing with the client.
O.C. 129-2015, s. 104.