The binding legal principles established are: (1) The categories of services (technical, managerial, administrative, or consultative) in the definition of 'fees' under the Seventeenth Schedule are disjunctive and of wide general application, encompassing most activities of a taxpayer; (2) Sales and marketing commission services involving expertise, negotiation, processing documentation, and professional advisory services fall within the definition of fees for technical, managerial, administrative and consultative services; (3) A 'payer' under the Seventeenth Schedule includes any person who has an unconditional obligation to pay fees, regardless of the actual mechanics of payment; (4) Under paragraph 1(2)(c) of the Seventeenth Schedule, fees are deemed paid when arrangements are made for their payment, even if actual payment occurs offshore; (5) Under agency law principles applicable in Zimbabwe, actions of an agent (including offshore deduction of commission) are attributed to the principal for tax purposes; (6) The source of payment is determined by the originating cause (where services are performed), not where physical payment occurs; (7) Paragraph 6 of the Seventeenth Schedule creates a tax liability for failure to withhold non-resident tax on fees, not merely a penalty; (8) The statutory interpretation approach must consider the ordinary grammatical meaning of words in their textual and purposive context, consistent with the principles in Natal Joint Municipal Pension v Endumeni Municipality.