The proposed merger between TSB and Heartland Bank faces renewed headwinds as a legal challenge from a group led by a former TSB chairwoman has slowed progress on the deal.

Despite the intervention, the transaction is still scheduled to close in December, according to reports from New Zealand media.

The legal threat introduces uncertainty into the integration timeline, potentially complicating regulatory approvals and stakeholder alignment.

While the deal remains on track for year-end completion, the delay highlights the ongoing resistance from local stakeholders in Taranaki, who have expressed concerns about the consolidation of regional banking power.

This development adds another layer of complexity to an already scrutinized merger.

The involvement of a former chairwoman suggests deep internal disagreements over the strategic direction of TSB.