Westpac Banking (ASX:WBC, NZE:WBC) issued 13 billion yen in tier two subordinated callable instruments maturing in June 2036, according to a Thursday New Zealand bourse filing.

The proceeds will be used for general corporate purposes and are expected to marginally strengthen the bank's capital position, per the filing.

The securities include non-viability loss-absorption provisions, allowing the Australian Prudential Regulation Authority to convert them into ordinary shares or write them off if the bank is deemed non-viable, the filing said.