Overtime clauses are a near-universal feature of modern employment contracts in South Africa, typically framed in broad terms requiring employees to work overtime “as and when needed.” While such clauses appear to provide employers with operational flexibility, their legal enforceability is far from absolute. This article examines the statutory framework governing overtime, interrogates the enforceability of standard contractual clauses, and evaluates recent jurisprudence, with particular reference to AMCU obo Mkohonto & others v ANDRU Mining & others. 

It is argued that, contrary to common employer assumptions, overtime clauses are frequently unenforceable due to statutory limitations, interpretative challenges, and the requirement of ongoing consent. 

The regulation of working time in South Africa is primarily governed by the Basic Conditions of Employment Act 75 of 1997 (BCEA). Section 9 establishes the threshold for “ordinary hours of work,” limiting employees to: 

• 45 hours per week; 
• 9 hours per day (if working five days or fewer); or 
• 8 hours per day (if working more than five days). 

Any time worked beyond these limits constitutes overtime. Crucially, section 10(1)(a) of the BCEA provides that an employer may not require or permit an employee to work overtime except in accordance with an agreement. This provision introduces a foundational principle: overtime is consensual, not compulsory. 

Although the BCEA does not require overtime agreements to be in writing, it is standard practice to include such provisions in employment contracts. These clauses are often broadly phrased, creating the impression of an ongoing and indefinite obligation. 

However, the legal validity of such clauses is undermined by section 10(5) of the BCEA, which provides that an agreement to work overtime concluded at the commencement of employment, or within the first three months, lapses after one year. 

This statutory limitation is frequently overlooked in practice. The implication is significant: 

• A standard overtime clause included at the outset of employment does not endure indefinitely; 
• After one year, the clause becomes unenforceable unless renewed; 
• Continued overtime work may give rise to disputes regarding tacit consent, but does not automatically revive enforceability. 

The Problem of Tacit Consent 

Employers may argue that employees who continue to work overtime beyond the first year have implicitly agreed to do so. While South African contract law recognises tacit agreements, reliance on such arguments is inherently uncertain. 

Employees may contend that their compliance was ad hoc rather than indicative of a standing agreement. This creates evidentiary and interpretative difficulties, particularly where no formal renewal of the overtime agreement has taken place. 

The Labour Court’s decision in AMCU obo Mkohonto & others v ANDRU Mining & others (2023) provides critical judicial clarity on the issue. 

Facts: A group of employees refused to comply with an instruction to work additional hours to meet production targets. They were dismissed for gross insubordination. 

The Court held that, in most instances, the employees’ overtime agreements had lapsed years prior. The instruction to work overtime was therefore unlawful and unreasonable. A refusal to comply with an unlawful instruction cannot constitute insubordination. 

Even in the case of the one employee whose agreement remained valid, the Court found dismissal to be disproportionate, emphasising the importance of progressive discipline. All employees were reinstated with retrospective effect and awarded substantial back pay, underscoring the serious consequences of relying on unenforceable contractual provisions. 

The decision aligns with principles articulated in Palluci Home Depot (Pty) Ltd v Herskowitz and Others, where the Labour Appeal Court held that: 

• Not all insubordination justifies dismissal; 
• The refusal must be deliberate, serious, and persistent; 
• Dismissal is a measure of last resort. 

Where an instruction is unlawful, such as requiring overtime without a valid agreement, it cannot form the basis of disciplinary action. 

The legal framework imposes several obligations on employers seeking to enforce overtime: 

Renewal of Agreements:  

Employers must implement systems to ensure that overtime agreements are renewed annually, particularly where the initial agreement was concluded at the start of employment. 

Reasonableness of Instructions: 

Even where a valid agreement exists, instructions to work overtime must be: 

1. Operationally justified; 
2. Reasonable in scope and timing; 
3. Issued with appropriate notice where possible. 
4. Drafting Considerations 

Overtime clauses should be carefully structured to include: 

• Notice periods for overtime work; 
• Reference to predictable operational demands (e.g., seasonal peaks); 
• Clear limitations to avoid overbreadth. 

Disciplinary Approach 

Employers should adopt progressive discipline, reserving dismissal for cases of gross insubordination characterised by repeated and deliberate refusal. 

Where employees refuse to enter into a renewed overtime agreement, employers are not without recourse. In appropriate circumstances, dismissal for operational requirements (retrenchment) may be considered under the Labour Relations Act 66 of 1995. 

However, such action requires: 

• Demonstration of genuine operational necessity; 
• Compliance with procedural fairness, including consultation; 
• Consideration of alternatives to dismissal. 

Conclusion 

The assumption that a standard overtime clause creates a perpetual obligation is legally flawed. The BCEA imposes a clear temporal limitation on overtime agreements, rendering many commonly used clauses unenforceable after one year. 

The jurisprudence, particularly the ANDRU Mining decision, reinforces the principle that employer authority is constrained by legality and fairness. An instruction to work overtime must not only be contractually grounded but also lawful and reasonable. 

Ultimately, the enforceability of overtime clauses depends on ongoing consent, proper contractual management, and adherence to statutory requirements. Employers who fail to appreciate these limitations expose themselves to significant legal and financial risk, including reinstatement orders and back pay awards. 

Written by Ross Hendriks, Specialist Employment and Labour Law, SchoemanLaw Inc