Novation: When Does A New Agreement Replace An Existing Obligation?

Contracting parties often enter into new agreements to amend existing contractual terms, restructure outstanding debts or resolve disputes. However, the conclusion of a new agreement does not necessarily mean that the previous agreement, or the obligations arising from it, cease to exist.

In South African contract law, an important distinction exists between extinguishing an existing obligation and replacing it with a new one, and merely varying the terms of an obligation that continues to exist. This is where the principle of novation becomes relevant.

Understanding when novation occurs, and when it does not, can have significant consequences for the rights and obligations of contracting parties, particularly where debts, settlement agreements and acknowledgments of debt are concerned.

What is novation?

Novation is the replacement of an existing legal obligation with a new obligation, with the result that the original obligation is extinguished. Once a valid novation takes effect, the original obligation can no longer be enforced.

For example, two businesses may conclude an agreement for the supply of goods and later agree to abandon that agreement and enter into a new agreement containing different obligations, expressly providing that the new agreement replaces the original agreement. Provided the requirements for a valid contract are satisfied, this would constitute novation.

Importantly, however, the mere conclusion of a subsequent agreement does not mean the original agreement, or the obligations arising from it, automatically fall away. Whether novation has occurred depends on whether the parties intended the new agreement to replace, rather than merely amend or supplement, the existing obligation. 

When does novation occur?

In Swadif (Pty) Ltd v Dyke 1978 (1) SA 928 (A), the Appellate Division explained that voluntary novation is fundamentally a matter of intention and agreement. The parties must intend that the existing obligation be extinguished and replaced by a new, valid obligation.

South African law recognises a presumption against novation. This means that, where parties enter into a subsequent agreement relating to an existing obligation, the law does not automatically presume that they intended to extinguish the original obligation. Rather, the party alleging novation must establish that the parties intended for the new agreement to replace the existing obligation.

This intention, commonly referred to as animus novandi, may be expressed directly in the agreement or inferred from the surrounding circumstances. Where it is not expressly stated, the circumstances must support a clear and necessary inference that the parties intended novation.

Novation may therefore occur in circumstances such as the following:

1. Replacement of an existing agreement

Parties may expressly agree that a new agreement replaces and supersedes an earlier agreement. For example, a new agreement may provide that all rights and obligations arising from a previous agreement are extinguished and replaced by those contained in the new agreement.

Such wording provides strong evidence of an intention to novate, although the agreement must still be interpreted in its proper context.

2. Replacement of an existing obligation

Even where the parties do not expressly use the word "novation", their agreement and surrounding conduct may demonstrate an intention to replace an existing obligation.

Differences between the old and new obligations may be relevant, including changes to the amount owed, payment obligations, interest provisions and security arrangements. However, these differences are not necessarily conclusive. The question remains whether the parties intended to extinguish the existing obligation and replace it with a new one, or merely vary its terms while leaving the existing obligation in place.

3. Compromise of a disputed claim

Novation may also arise through a compromise, known in law as transactio.

A compromise occurs where parties settle an existing dispute or uncertainty through an agreement intended to resolve the disputed obligations. Unlike an ordinary repayment arrangement, a genuine compromise may extinguish the original disputed claim and replace it with obligations arising from the settlement.

For example, suppose a contractor claims R300 000 for services rendered, but the client disputes the quality of the work and denies liability for the full amount.

The parties subsequently agree to settle the dispute through a payment of R200 000 in full and final settlement of the claim, intending that the settlement replace their disputed obligations.

Such an agreement may constitute a compromise which, depending on its terms and the parties’ intention, may have the effect of novating the original disputed obligation.

The significance of a compromise is that the parties' rights and obligations in respect of the settled dispute are thereafter governed by the compromise agreement.

When does novation not occur?

Not every subsequent agreement constitutes novation. In many instances, parties intend to preserve an existing obligation while changing how it must be performed or enforced.

1. Acknowledgments of debt

An acknowledgment of debt (AOD) is a written document in which a debtor acknowledges an existing indebtedness to a creditor. It may record the amount owed, repayment terms, interest and the consequences of default.

An AOD does not automatically novate the underlying debt.

For example, suppose a debtor owes a creditor R100 000 under an existing loan agreement. After failing to make payment, the debtor signs an AOD confirming the outstanding amount and undertaking to repay it in monthly instalments.

In these circumstances, the AOD may simply confirm the existing liability and regulate its repayment. The original debt has not necessarily been extinguished or replaced.

Where an AOD does not constitute novation, the original cause of action may remain available to the creditor, subject to the provisions of the AOD. The creditor cannot, however, recover the same debt twice.

Importantly, an AOD can constitute novation where its terms and the parties' intentions establish that the existing obligation was intended to be extinguished and replaced.

The distinction therefore does not depend on whether the document is called an AOD, but on its substance and legal effect.

2. Payment arrangements and extensions of time

An agreement allowing a debtor additional time to pay, or providing for repayment in instalments, does not ordinarily constitute novation merely because the payment terms have changed.

This distinction was illustrated in Shackleton Credit Management CC v Standard Bank of South Africa Ltd and Others 2023 JDR 0996 (GP). The parties had concluded a settlement agreement providing for repayment of an outstanding debt in monthly instalments. One of the questions before the Court was whether the settlement agreement constituted novation. The Court found that the party alleging novation had failed to establish the necessary intention. The agreement had not extinguished the original indebtedness but had instead provided for its repayment and enforcement.

Accordingly, the mere restructuring of a debt, even by way of a settlement agreement, does not necessarily result in novation.

3. Amendments to existing agreements

Parties may amend certain contractual terms without replacing the underlying agreement.

For example, a landlord and tenant may agree to reduce the monthly rental payable under an existing lease agreement while leaving all other terms unchanged.

In such circumstances, the original lease agreement continues to operate, subject to the agreed amendment.

This constitutes a variation of the existing agreement rather than novation. The distinction is important: variation modifies an existing contractual obligation, whereas novation replaces it.

4. Agreements that supplement existing obligations

A subsequent agreement may also introduce additional obligations or mechanisms without extinguishing the original agreement.

In Richard Meaden & Associates Incorporated v Global Merchant Supply Services (Pty) Ltd 2025 JDR 4405 (GJ), the Court considered a payment plan and a subsequent payment accommodation.

The later document expressly recorded that the earlier payment arrangement remained in full force and effect. The Court rejected the contention that the later arrangement had novated the earlier payment plan.

This illustrates the importance of wording that preserves existing obligations. Where parties expressly agree that an earlier agreement remains operative, this may provide compelling evidence against an intention to novate.

Why does the distinction matter?

Whether an agreement constitutes novation can have important legal and commercial consequences.

Firstly, novation affects the enforceability of existing rights. Where an obligation has been validly novated, the creditor generally cannot disregard the replacement agreement and enforce the extinguished obligation.

Secondly, novation may affect rights and protections associated with the original obligation, including security arrangements. Parties should therefore consider the effect of novation on existing guarantees, suretyships and other security rights, and whether these are intended to continue in respect of the replacement obligation.

Thirdly, the distinction may influence the basis upon which a creditor institutes legal proceedings. Where no novation has occurred, the original cause of action may remain available, whereas a valid novation ordinarily requires enforcement of the replacement obligation.

Conclusion

The conclusion of a new agreement does not necessarily bring an existing obligation to an end. Whether novation occurs depends on the intention of the parties, the wording of the agreements and the circumstances surrounding their conclusion.

An acknowledgment of debt, payment arrangement or contractual amendment may preserve an existing obligation rather than replace it. Conversely, a replacement agreement or compromise may extinguish the original obligation and establish new rights and duties.

Before concluding any subsequent agreement, parties should therefore carefully consider its intended legal effect.

Zinhle Skosana

LLB

Candidate Attorney at Le Roux Vivier Attorneys

Disclaimer: The views expressed in this article are those of the author(s) and do not necessarily reflect the views of the firm. This content is provided for general information only and does not constitute legal advice. While every effort is made to ensure accuracy, the law may change and its application depends on the specific facts of each matter. Readers should seek professional legal advice before acting on any information contained herein. The firm and the author(s) accept no liability for any loss or damage arising from reliance on this content.