The binding legal principles are: (1) A taxpayer appealing a tax assessment is confined to the grounds stated in their objection under s 65(4) of the Income Tax Act, unless the court grants leave to rely on other grounds; (2) A court cannot grant relief on matters not raised, pleaded, argued, or evidenced before it (per Proton Bakery (Pvt) Ltd v Takaendesa 2005 (1) ZLR 60 (S)); (3) The doctrine against approbation and reprobation prevents a taxpayer from taking two inconsistent positions—claiming expenditure is both revenue in nature and simultaneously claiming capital allowances (per Hlatshwayo v Mare & Deas 1912 AD 242); (4) Where legislation is amended to specifically include or define terms not previously defined, such amendment extends the scope of the provision and operates prospectively from the date specified, unless the legislature expressly indicates the amendment is clarificatory; (5) Computer software did not fall within 'articles, implements, machinery or utensils' under the Fourth Schedule to the Income Tax Act as it existed in 2009; the 2014 amendment specifically including computer software was not clarificatory but created a new entitlement effective from 1 January 2015; (6) An election for special initial allowance under the Fourth Schedule must be made during the arrangement of a taxpayer's affairs, not during appeal proceedings; (7) A court order that is inconsistent with the governing statute is incapable of implementation and must be set aside.