MTN International (Mauritius) Ltd v Commissioner of South African Revenue Services

MTN International (Mauritius) Ltd, a subsidiary of the MTN Group, claimed deductions for interest expenditure on two loans (a Nigeria loan and an Investcom loan) in its 2006 income tax return. On 31 March 2011, the last day before prescription, SARS issued a revised assessment disallowing the interest deductions and creating an additional tax liability of R73 476 101. In issuing the IT40 assessment, a SARS official manually fixed the 'due date' as 30 March 2011, one day before the assessment was actually raised, due to a misunderstanding of the system. MTN contended that this backdating rendered the revised assessment unlawful and invalid. SARS later issued an IT34 assessment reflecting later due dates. MTN applied to the High Court to have the revised assessment set aside and the tax refunded. The High Court dismissed the application, and MTN appealed to the Supreme Court of Appeal.

The appeal was dismissed with costs, including the costs of two counsel.

This case clarifies that an income tax assessment is not rendered invalid by an incorrect or unworkable due date on the notice of assessment. It affirms a substance-over-form approach in South African tax law and limits the circumstances in which administrative errors by SARS will invalidate assessments. The judgment provides important guidance on prescription, assessments, and taxpayers’ objection rights under the Income Tax Act.