Section 16(1)(a) disallows “the cost incurred by any taxpayer in the maintenance of himself, his family or establishment”. In simple terms, personal living expenses cannot be deducted from business income. Likewise, Section 16(1)(b) prohibits deductions for “domestic or private expenses,” including the cost of daily life and household, as well as commuting costs (travel between home and workplace). The rationale is straightforward: such costs are not incurred in producing taxable income, but rather to maintain one’s personal life. For example:
Home maintenance and family costs: Rent or groceries for your household, school fees for children, personal medical bills, clothing, and food are intrinsically private expenditures and never deductible for tax purposes.
Commuting to work: If you spend money on fuel or transport from your home to your office (or between distinct businesses you operate), that travel is considered private in nature and not an allowable business expense. It merely puts you in a position to earn income, rather than producing income itself.
These rules were confirmed in L v Commissioner of Taxes (1991), where a lawyer’s eye surgery expenses were disallowed. The taxpayer argued good eyesight was essential for her work, but the High Court held that medical costs are personal, not incurred for trade purposes, and thus not deductible – in fact, they are expressly characterized as domestic/private expenses prohibited by Section 16(1)(a) and (b). This case underlines the principle that an expense does not become “business” simply because it helps one work; if it fundamentally pertains to personal well-being, it remains non-deductible.
Practical example: Suppose a sole trader attempts to deduct grocery bills or home utility bills as business costs – such claims will be rejected by ZIMRA under Section 16(1)(a). Similarly, driving from home to the shop you own is a personal commute; fuel for that trip is not deductible (Section 16(1)(b)), unlike fuel used within the business operations (say, delivering goods to customers) which would be allowed. The tax logic is to prevent abuse and clearly separate private living costs from genuine business outgoings.
