NABC v MIMIA

The High Court of Australia considered an appeal by NABC against a decision of the Full Federal Court concerning the interpretation of a settlement agreement. The dispute arose from a prior legal proceeding between NABC and MIMIA, which had been resolved by a deed of settlement. NABC sought to enforce certain terms of this deed, alleging that MIMIA had breached its obligations.

The central legal issue before the High Court was whether the settlement deed, when read as a whole and in light of the surrounding circumstances, imposed an obligation on MIMIA to pay NABC a sum of money calculated by reference to a specific formula, or whether MIMIA's obligation was limited to a fixed amount. The Court had to determine the proper construction of the relevant clauses within the deed and the extent to which extrinsic evidence could be admitted to aid in its interpretation.

Gummow and Kirby JJ, in their joint judgment, applied principles of contractual interpretation, emphasising that the primary task is to ascertain the objective meaning of the terms of the contract. They considered the language used in the deed, the context in which it was made, and the commercial purpose it was intended to serve. The Court found that the wording of the deed, particularly when read in conjunction with other provisions, indicated that MIMIA's obligation was to pay a sum calculated according to the specified formula, rather than a fixed amount. The Court affirmed that while extrinsic evidence is generally inadmissible to contradict or vary the plain meaning of a written contract, it may be admitted to assist in the interpretation of an ambiguous provision or to establish the existence of a collateral contract. In this instance, the Court found the relevant provisions to be sufficiently ambiguous to warrant consideration of the surrounding circumstances.

The High Court allowed the appeal, setting aside the orders of the Full Federal Court and remitting the matter to the Federal Court for further proceedings consistent with the High Court's reasons.