When a buyer pays for a business, a significant portion of what they are acquiring is goodwill — the value attached to the business's reputation, its customer relationships, its brand, and the commercial momentum it has built. Without a restraint of trade clause, the seller could immediately set up a competing operation, approach the same customers, hire back the same staff, and systematically destroy the goodwill the buyer has just paid for.
A well-drafted restraint of trade clause is therefore not a mere contractual formality — it is the mechanism that gives the purchase price meaning. South African courts have long recognised this, and restraints in the context of a business sale attract a stronger presumption of enforceability than those found in ordinary employment contracts. Understanding what makes a restraint valid, and how to draft one that will be upheld, is essential for any buyer or seller engaging in a business sale transaction.
Restraint of Trade vs Employment Context
The foundational case governing restraints of trade in South African law is Magna Alloys & Research (SA) (Pty) Ltd v Ellis 1984 (4) SA 874 (A). The Appellate Division departed from the English common law position — which treated restraints as prima facie void — and held that South African law treats a restraint of trade agreement as valid and binding unless it is shown to be unreasonable and contrary to public policy.
Employment Restraints
In the employment context, there is an inherent inequality of bargaining power between employer and employee. Courts scrutinise employment restraints carefully, giving significant weight to the employee's constitutional right to freedom of trade and the economic hardship that enforcement can cause. The onus remains on the restrained party to show unreasonableness, but courts are generally more willing to find grounds for limiting or refusing enforcement of employment restraints.
Business Sale Restraints
Where a restraint is given as part of the sale of a business or a shareholding, courts approach enforceability very differently. The seller has typically negotiated the purchase price and voluntarily agreed to the restraint as part of a commercial transaction between parties of comparable bargaining power. Courts have consistently held that the restraint is an integral part of the consideration for the goodwill — the buyer could not have obtained it at the same price without the restraint. This commercial context results in stricter enforcement and less sympathy for a seller who seeks to escape their agreement.
The Basson v Chilwan Test
The modern test for the enforceability of a restraint of trade clause comes from Basson v Chilwan 1993 (3) SA 742 (A). The court articulated four questions that must be answered when determining whether a restraint is enforceable. All four are weighed together — no single factor is necessarily decisive, and the analysis is ultimately one of reasonableness in all the circumstances.
The Four Basson Questions
| # | Question | What Courts Consider |
|---|---|---|
| 1 | Does the restraint protect a legitimate interest? | The buyer must have a protectable proprietary interest — goodwill, customer relationships, trade secrets, confidential information, or supplier relationships. A restraint that protects nothing more than the buyer from competition in the abstract will not be enforced. |
| 2 | Is that interest being harmed? | The court examines whether the restrained party's conduct — actual or threatened — would harm the legitimate interest being protected. Without a real threat to identifiable interests, a restraint cannot be justified. |
| 3 | Does harm to the restrained party outweigh benefit to the enforcing party? | The court weighs the restriction on the seller's freedom of trade against the benefit the buyer obtains from enforcement. If the geographic scope, duration, or breadth of activities covered is grossly disproportionate to what is genuinely needed to protect the goodwill, the balance may favour non-enforcement. |
| 4 | Is there a public interest consideration? | Restraints that restrict the use of specialised skills needed by the public, or that create a monopoly in an essential service, may be refused enforcement on public policy grounds. This factor is rarely determinative in ordinary business sale restraints. |
In the business sale context, the first question — whether there is a legitimate interest — is almost always answered affirmatively. The goodwill that the buyer has purchased is a classic protectable interest, and the seller's knowledge of the business's customers, suppliers, and confidential operating methods makes the threat of harm real and direct.
What Can Be Protected
A restraint in a business sale agreement can legitimately protect a range of interests. The most important of these is goodwill — but courts have recognised several related categories that a buyer can properly seek to safeguard.
Goodwill
The most fundamental protectable interest in any business sale. Goodwill represents the commercial attractiveness of the business — the likelihood that customers will return, that the business's name carries value, and that its market position is worth preserving. A seller who immediately competes destroys the very thing the buyer has paid for, and courts will readily enforce a properly scoped restraint to prevent this.
Customer Relationships
The seller's pre-existing relationships with the business's customers are a core component of goodwill. A seller who approaches former customers immediately after the sale and diverts their business to a competing enterprise is causing exactly the harm that the restraint is designed to prevent. This is perhaps the most common ground on which buyers seek to enforce restraints.
Trade Secrets and Confidential Information
Proprietary processes, formulas, pricing strategies, customer databases, supplier terms, and other confidential business information acquired over years of operation are protectable. A seller who takes this knowledge into a competing operation gets an illegitimate head start that the buyer has paid to prevent. A restraint preventing use or disclosure of confidential information is both appropriate and well-supported by case law.
Supplier Relationships
In many businesses, preferential access to particular suppliers — especially where the seller has cultivated those relationships over many years — forms part of the goodwill being sold. A seller who leverages those supplier relationships to the detriment of the buyer's business can properly be restrained. Non-solicitation of key suppliers is a legitimate addition to a business sale restraint.
Key Employees — Non-Solicitation Clauses
The seller's knowledge of key employees — their skills, remuneration, and availability — gives them an unfair advantage if they are allowed to poach those employees for a competing business immediately after the sale. A separate non-solicitation clause covering key employees is standard practice in well-drafted business sale agreements. Courts have upheld non-solicitation of employees as a legitimate protective measure, particularly where the seller had intimate knowledge of the workforce.
Geographic Scope
A restraint of trade clause must be geographically limited to the area within which the business actually traded at the time of the sale. A restraint that purports to restrict the seller from competing throughout South Africa when the business only operated in the Western Cape will be considered overbroad and may be struck down as unreasonable.
National Scope
National restraints are appropriate where the business genuinely operated nationally — for example, where it had customers across multiple provinces, conducted e-commerce throughout South Africa, or provided services to clients in multiple centres. The buyer must be able to demonstrate that the geographic scope reflects the actual trading footprint of the business. Courts have upheld national restraints in appropriate cases, particularly where businesses operated across provincial boundaries and the goodwill extended nationally.
Provincial or Local Scope
Most small and medium business restraints operate at a provincial or local level. A retail or professional services business operating in Gauteng should have a Gauteng-limited restraint. A business serving a specific city or town should have its restraint limited to that area and its surrounds. Courts have refused to enforce national restraints where the evidence shows the business was local — the geographic scope must be calibrated to actual market presence, not aspirations.
Online and Remote Businesses
For businesses operating primarily online or providing remote services without a physical geographic boundary, geographic limitation by province or city may be artificial. In these cases, practitioners increasingly draft restraints in activity-based rather than purely geographic terms — restricting the seller from operating in the same sector or serving the same customer base rather than limiting the area. Courts have not definitively settled this area, and careful drafting is required.
Duration
Restraints in business sale agreements typically run for longer periods than employment restraints. While employment restraints of one to two years are common, business sale restraints of three to five years are standard, and courts have upheld restraints of longer duration where the circumstances justified them — particularly where the business's goodwill was built over many years and would take time for the buyer to consolidate.
Typical Duration Range
For most business sale transactions, a restraint of three to five years is considered reasonable and is regularly upheld by courts. This reflects the time needed for the buyer to establish their own relationships with customers and suppliers and to embed the business's goodwill under new ownership.
For high-value businesses with deeply entrenched goodwill, or where the purchase price includes a significant goodwill premium, a restraint of up to seven years may be supportable — but the longer the period, the more carefully it must be justified.
Commencement Date
The commencement date of the restraint period matters significantly. Where the seller will continue to work in the business for a transition period after the sale — as an employee or consultant — the restraint should commence on the date that employment or consulting arrangement ends, not on the sale closing date.
If the restraint commences on closing but the seller remains actively involved in the business for two years thereafter, the effective restraint period is eroded. The restraint agreement must clearly specify the triggering event for the commencement of the restraint period.
Activities Restricted
A restraint clause must clearly define the activities that the seller is prohibited from engaging in. Vague or overly broad restrictions create enforcement difficulties and invite challenge. The activities restricted should correspond directly to the business sold — restrictions that sweep up activities unrelated to the sold business will be treated with suspicion.
Competing in the Same Business
The core restriction is typically that the seller may not, directly or indirectly, carry on, be engaged in, be interested in, or assist any business that competes with the business sold. The phrase "same business" requires careful definition — an overly broad definition that captures every conceivable related activity may be struck down, while an overly narrow definition may be easily circumvented. The activity description should track the actual business description in the sale agreement.
Soliciting Customers
A non-solicitation clause prohibiting the seller from approaching, soliciting, or accepting business from existing customers of the sold business is a critical component. This is often easier to enforce than a broad non-compete because it is targeted at specific harm. Courts have consistently held that solicitation of customers whose details the seller knew as a result of their involvement in the business constitutes a clear interference with the buyer's goodwill.
Poaching Employees
A non-solicitation of employees clause prevents the seller from inducing key employees of the sold business to resign and join a competing enterprise. This is particularly important where key staff are central to the business's goodwill — specialist professionals, sales people with strong customer relationships, or technical experts whose knowledge is embedded in the business's operations.
Disclosing Confidential Information
An obligation not to use or disclose confidential information of the business — typically surviving the restraint period indefinitely — prevents the seller from weaponising knowledge of the business's pricing, supplier terms, client lists, and proprietary processes. This obligation exists independently of the restraint period and can be enforced even after the non-compete period has expired.
Defining "Same Business"
Drafters should define the restricted business activity with reference to the specific sector, products, services, and customer segments of the sold business. A definition that is too narrow may allow the seller to compete in a slightly different format; one that is too broad may be challenged as exceeding what is necessary to protect the goodwill. Where the business operates in a narrow niche, a tight activity definition is both appropriate and more easily enforced. Where it operates across multiple sectors, each should be separately identified.
The Blue-Pencil Doctrine
South African courts do not simply enforce or refuse a restraint as drafted — they have the power to modify it. The blue-pencil doctrine allows a court to strike out the unreasonable portions of a restraint clause and enforce the remainder, provided the remaining text continues to make sense without the excised portions.
How Blue-Pencilling Works
If a restraint covers a geographic area that is too wide but is otherwise reasonable, a court may sever the excessive geographic reference and enforce the clause within a smaller area. Similarly, if the duration is excessive, a court may enforce the clause for a shorter period. The doctrine requires that the offending words can be struck out without needing to re-write or add to the clause — it is a tool of severance, not of re-drafting.
Basson's Approach vs Strict Severance
The Basson approach goes further than the traditional blue-pencil doctrine. Rather than mechanically severing words, courts conducting a Basson analysis look at the overall reasonableness of the restraint in its commercial context. Courts have, in appropriate cases, refused to blue-pencil and instead struck down the entire clause where the unreasonable scope was so fundamental that severance would distort the parties' original agreement. The practical lesson is that it is far better to draft the restraint correctly from the outset than to rely on judicial blue-pencilling to save an overbroad clause.
Consideration
A restraint of trade agreement must be supported by adequate consideration to be enforceable. In the context of a business sale, the purchase price itself — which is paid partly for the goodwill and partly for the seller's agreement not to compete — typically constitutes sufficient consideration for the restraint. Courts have consistently held that a seller who accepts the purchase price cannot later claim that the restraint is unsupported by consideration.
Purchase Price as Consideration
Where the business sale agreement explicitly describes the purchase price as consideration for both the business assets and the seller's covenant not to compete, the consideration requirement is satisfied. Some agreements allocate a specific portion of the purchase price to the restraint — this is not legally required but can strengthen the position that the restraint is fully supported by consideration and that the seller received real value for agreeing to it.
Separate Consideration for Key Managers
Where the buyer requires key managers or employees of the sold business to enter into restraint agreements — in addition to the restraint given by the seller — separate consideration must be provided to each such person. A manager who is not a party to the sale agreement and receives no part of the purchase price cannot be bound by a restraint contained in the sale agreement without being given independent consideration. This is typically addressed by a separate restraint agreement with each key employee, supported by a retention bonus, enhanced severance, or other specific payment.
Breaching a Restraint
When a seller breaches a restraint of trade clause, the buyer has several potential remedies — but enforcement is rarely straightforward. The practical difficulties of proving breach and establishing damages mean that the best protection against breach is a well-drafted restraint that clearly defines what is and is not permitted.
Interdict (Urgent Court Application)
The most immediate and commonly sought remedy for a restraint breach is an interdict — a court order compelling the seller to stop competing, cease soliciting customers, or desist from disclosing confidential information. Interdicts in restraint cases are often sought on an urgent basis, and courts can issue interim interdicts within days if the threat to the buyer's goodwill is sufficiently clear and immediate. The buyer must show a prima facie right (the restraint), a threatened or ongoing infringement, and that the balance of convenience favours granting the order.
Damages
A buyer who suffers financial loss as a result of the seller's breach can claim damages. The difficulty is quantification — proving the precise revenue lost as a result of the seller's competition, as distinct from losses attributable to other causes, requires detailed financial evidence and is rarely simple. Expert evidence on the value of the goodwill eroded and the revenue diverted is typically required in damages claims.
Forfeiture of Consideration
Some business sale agreements include a penalty clause providing that if the seller breaches the restraint, they must repay a portion of the purchase price or forfeit a deferred payment. Courts will enforce penalty clauses in restraint agreements provided the penalty is not grossly disproportionate to the harm caused. The Conventional Penalties Act 15 of 1962 gives courts discretion to reduce a disproportionate penalty to a fair level, but a reasonable penalty clause is an effective additional deterrent against breach.
Practical Difficulties of Enforcement
Proving that a seller is competing in breach of a restraint — particularly if they operate through a third party, a spouse's business, or in a slightly different sector — can be challenging. Surveillance, digital evidence, and customer testimony may all be required. Buyers should treat the restraint clause as one layer of protection, not the only protection — ongoing relationship management with customers, service quality, and consolidation of the business's goodwill under new ownership are equally important.
Drafting Tips
A restraint that is too wide will be challenged or ignored; one that is too narrow will fail to protect the goodwill it was meant to safeguard. The following practical guidelines are essential for drafting a restraint clause in a business sale agreement that will be commercially effective and legally enforceable.
Six Practical Drafting Guidelines
- 1
Calibrate the geographic scope to the actual trading area.
Document the geographic footprint of the business before drafting — customer locations, delivery areas, and service regions. Do not expand the scope to where you hope the business will operate in future.
- 2
Define the restricted activities with precision.
Reference the actual products, services, and customer segments of the sold business. Avoid general descriptions like "any similar business" that invite challenge. If the business operates across multiple verticals, list each one explicitly.
- 3
Specify the commencement date carefully.
If the seller will continue in the business after closing, the restraint should commence on termination of their post-closing involvement, not on the closing date. Failure to do this can result in the effective restraint period being shorter than intended.
- 4
Include separate non-solicitation clauses for customers and employees.
A non-solicitation clause is narrower than a non-compete and is easier to enforce. Even where a court might be reluctant to enforce a broad non-compete, it is more likely to enforce a targeted non-solicitation of named customers or key employees.
- 5
Address indirect participation explicitly.
A seller who sets up a competing business in a spouse's name, operates through a family trust, or acts as a consultant to a competitor may argue they are not personally competing. The restraint should explicitly cover direct and indirect participation, whether as shareholder, director, employee, consultant, partner, or otherwise.
- 6
Obtain separate restraints from key managers.
The restraint given by the seller binds the seller. Key managers, technical staff, or salespeople who are not party to the sale agreement are not bound by it. Obtain separate restraint or non-solicitation agreements from each key person, supported by separate consideration, before closing.
Related Topics
Continue exploring our business sale guides for a complete picture of what selling a business involves in South Africa:
- Selling a Business Overview — The complete guide to structuring and executing a business sale in South Africa
- Competition Law — Merger notifications and Competition Act considerations in a business sale
- Costs and Fees — A full breakdown of the professional and statutory costs of selling a business
Need a Restraint of Trade Agreement?
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