ASB has slashed its five-year fixed home loan rates by up to 30 basis points, becoming the third major New Zealand bank to reduce longer-term mortgage costs in recent weeks.

The move comes as the lender simultaneously increases rates on shorter-term lending options, reflecting a nuanced approach to funding costs and risk management ahead of the Reserve Bank of New Zealand's upcoming Official Cash Rate decision.

The bank's decision to cut longer-term rates while hiking short-term ones suggests a strategic rebalancing of its loan book.

By lowering the cost of five-year fixed loans, ASB aims to attract borrowers seeking stability in a volatile rate environment, while higher short-term rates may reflect tighter liquidity conditions or increased risk premiums for variable exposures.

This dual approach mirrors recent moves by peers, including ANZ, which recently cut both home loan and term deposit rates in response to declining wholesale funding costs.

The timing of ASB's adjustment is critical, occurring just before the RBNZ's policy announcement.