Signed Under Pressure: When Is Consent Really Consent?
Duress, undue influence and the line between tough negotiations and compromised consent in commercial contracts.
Gilles van de Wall


Commercial contracts depend on real consent. A signature is powerful, but it is not always final. If consent was obtained through unlawful pressure, coercion or improper manipulation, the affected party may have grounds to challenge the agreement.
For companies, this matters in shareholder exits, settlement agreements, supplier negotiations, restraint agreements, debt restructurings, family-business arrangements and transactions concluded under financial or operational pressure.
Duress: pressure that crosses the legal line
Duress involves unlawful pressure that induces a party to contract. It may take the form of threats to person, property or economic interests. The classic South African authority is Broodryk v Smuts NO, which dealt with consent obtained through fear caused by illegitimate pressure.
The courts have also recognised economic duress in appropriate circumstances. The question is not simply whether the deal was hard or commercially unpleasant. The question is whether unlawful pressure left the victim with no reasonable alternative but to submit.
Hard bargaining is not automatically duress. Commercial pressure, deadlines and tough negotiations are normal in business. Duress arises when the pressure becomes unlawful or illegitimate and materially causes the contract.
Undue influence: when trust is misused
Undue influence is different from duress. It does not require a threat. It arises where one party uses a position of influence, trust, dependency or dominance in an unconscionable way to procure consent.
The leading authority remains Preller v Jordaan, which sets out the core enquiry: influence must exist, the weaker party ability to resist must be weakened, the influence must be exercised improperly, the transaction must be prejudicial, and the influence must cause the contract.
Undue influence may arise in personal relationships, family-company structures, advisor-client relationships, elderly-parent transactions, dependent shareholder arrangements or business relationships where one person effectively controls another decision-making freedom.
What boards and executives should do
Record negotiation history properly.
Avoid threats that are not legally supportable.
Ensure vulnerable parties receive independent advice.
Use cooling-off periods where the relationship is sensitive.
Keep board approvals and conflict declarations on record.
Avoid rushing signatures when dependency, pressure or emotional leverage is obvious.
The commercial lesson
A strong contract is not only well drafted. It is also cleanly concluded. Businesses should focus not only on what the agreement says, but on how consent was obtained. A contract signed under unlawful pressure may become a dispute waiting to happen.
Build Well. Govern Wisely. Build With Confidence.