The binding legal principles established are: (1) For purposes of non-resident withholding tax under section 30 and the Seventeenth Schedule of the Income Tax Act, "fees" includes any amount paid for services of a technical, managerial, administrative or consultative nature, regardless of whether such payment is labeled as "commission" or by another name - the substance of the services rendered determines the tax characterization. (2) The ordinary, plain, literal meaning of statutory terms must be adopted unless at variance with legislative intention as shown by context, applying the golden rule of interpretation. The terms "technical," "managerial," "administrative," and "consultative" are to be given their dictionary meanings. (3) Services involving practical specialized knowledge and skills (such as understanding product characteristics, blending requirements, climatic and soil conditions) constitute "technical" services. Services involving directing activities, price negotiations, and marketing logistics constitute "managerial" and "administrative" services. Services involving deliberation, conferring, and providing professional advice constitute "consultative" services. (4) Tax legislation is presumed not to have retrospective effect unless such construction appears clearly in the terms of the Act or arises by necessary and distinct implication. An amending Act that introduces new concepts does not retrospectively interpret earlier provisions unless it expressly or by implication purports to clarify the earlier statute. (5) A taxpayer who is the principal in an agency relationship and who pays or is liable to pay fees to a non-resident agent for the specified services has an obligation to withhold non-resident tax on those fees and remit such tax to the revenue authority, even where the fees are deducted by the agent from amounts collected abroad before remittance of the balance.