New Zealand officials have expressed strong displeasure over Australia’s recent unilateral changes to a bilateral tax treaty, describing the move as a breach of treaty obligations and “not cricket,” according to documents obtained by AFP.

The dispute, which surfaced earlier this year, centers on amendments to tax rules affecting property purchases by non-resident New Zealanders in Australia. The changes impose additional taxes on New Zealanders acquiring Australian real estate, a step New Zealand’s government characterizes as inconsistent with the terms of the existing tax treaty between the two countries.

Briefing papers prepared for New Zealand ministers criticized Australia’s actions as lacking consultation or negotiation, describing the unilateral decision as “in poor form.” Officials were reportedly encouraged to intensify efforts to challenge the policy.

In April, New Zealand’s Foreign Minister Winston Peters and Finance Minister Nicola Willis jointly sent a letter to their Australian counterparts articulating their concerns and signaling the treaty breach. The diplomats underscored that the new tax measures conflicted with Australia’s commitments under the treaty framework.

The strained episode highlights tensions beneath the generally amiable relationship shared by the trans-Tasman neighbors, who often engage in sports and cultural exchanges yet have previously clashed over issues such as sportsmanship and national culinary claims.

While the current diplomatic friction remains far less acrimonious than the infamous 1981 cricket incident—when Australian captain Greg Chappell instructed his brother Trevor to deliver an underarm ball during a match against New Zealand, a move widely condemned as unsportsmanlike—the dispute nonetheless raises concerns about cooperation and trust between the two countries.

New Zealand officials reportedly hope that sustained diplomatic engagement may lead Australia to revisit the tax policy, potentially resulting in revisions that align with treaty commitments and prevent further controversy.

In response to inquiries, a spokesperson from Australia’s Department of the Treasury indicated ongoing communication between the two governments. The spokesperson stated that Treasury officials continue to work closely with their New Zealand counterparts as part of broader discussions aimed at renegotiating aspects of the tax treaty.

The outcome of these negotiations remains uncertain, but the incident underscores the complexities of maintaining close bilateral relations amid domestic policy changes and divergent national interests.