Every figure, rule and computation in the rest of this course rests on a prior question that is rarely asked out loud: where does Zimbabwean tax law actually come from, and how do we read it correctly? This lesson answers that question. It maps the hierarchy of sources — the Constitution at the apex, then primary legislation (the tax Acts), then subsidiary legislation (regulations and statutory instruments), international agreements (double taxation agreements), judicial precedent (case law), the common law, and finally administrative material (ZIMRA practice notes and public notices) and academic writing — and it teaches the canons of construction a tribunal uses to decide what a contested provision means.
The foundational architecture is the two-statute design first introduced in the lesson on Income Tax Foundations. The permanent Income Tax Act [Chapter 23:06] sets out the structure — who is liable, on what, and how tax is computed and collected — while the annual Finance Act [Chapter 23:04] is the "charging Act", defined in Section 2 of the Income Tax Act as "the enactment by which credits and rates of tax are fixed". The substantive Acts (Income Tax, VAT, Capital Gains) create the obligations; the Finance Act fixes the rates each year and amends the substantive Acts. This is why every rate in this course is year-of-assessment-specific and why a section can say "at the rate fixed from time to time in the charging Act" without itself naming a number.
The constitutional layer sits above all of this. Under Zimbabwe's Constitution (the Constitution of Zimbabwe Amendment (No. 20) Act, 2013), the State may impose a tax only by, or under the authority of, an Act of Parliament — the bedrock principle of no taxation without representation. This is why a statutory instrument that purports to create or vary a tax can be struck down as ultra vires (beyond the power delegated). Zimbabwean courts have done exactly this: in Mlilo v ZIMRA 19-HH-605 the High Court found the statutory instrument introducing the Intermediated Money Transfer Tax to be ultra vires (the rate-setting power belonging to Parliament, later cured by the Finance Act), and the rate-fixing function of Parliament has been litigated in the carbon-tax and wealth-tax challenges (Gonese 22-HH-265; Matewu 24-HH-590). Delegated power, Section 90 of the Income Tax Act tells us, lets the Minister make regulations "for carrying out or giving effect to this Act" — machinery, not new charges.
International law enters through Sections 91–93 of the Income Tax Act: the President may enter into double taxation agreements (Section 91); where such an agreement provides a foreign-tax credit, Section 92 reduces the Zimbabwean tax payable by the credit (subject to a capping formula); and Section 93 gives unilateral relief where no treaty exists. A DTA does not tax — it allocates and relieves — and, crucially, a taxpayer cannot reach for a DTA before the domestic charging section has first been engaged.
When the words of a provision are genuinely doubtful, the courts apply settled canons of interpretation: the literal/strict approach to charging provisions (you are taxed only if you fall within the clear words — Cape Brandy Syndicate; Partington v Attorney-General, both English and persuasive only); the contra fiscum rule (a real ambiguity in a charging provision is resolved in favour of the taxpayer, while a person claiming an exemption or deduction must bring themselves clearly within it); and a modern purposive overlay that reads words in their context and against the mischief the provision was designed to cure. Substance is policed by the general anti-avoidance rule in Section 98 ("Tax avoidance generally"), which lets the Commissioner reconstruct an artificial transaction "as if [it] had not been entered into". Two onus rules run through everything: Section 63 (the Commissioner's determination stands unless the taxpayer proves it wrong) and the various "proved by the taxpayer" gateways in the charging sections.
Finally, precedent. Zimbabwe is a common-law jurisdiction operating the doctrine of stare decisis: the Constitutional Court and Supreme Court bind the courts below; High Court and the specialist Special Court for Income Tax Appeals (Income Tax Act Section 64) decisions guide ZIMRA and lower tribunals; pre-independence Rhodesian, Federal and Appellate Division decisions remain persuasive (and often binding until overruled); and South African authority is highly persuasive because of the shared Roman-Dutch common law and near-identical statutory language. ZIMRA practice notes and public notices are administrative guidance — useful, but not law; they cannot enlarge or contradict the Act, and the fiscus is generally not bound by an officer's error. Master this source hierarchy and these canons and you will never again be at the mercy of a confidently-quoted but unsourced "rate" or "rule".
