Japan Post Holdings might post impairment losses worth hundreds of billions of yen for fiscal 2016 related to its 2015 acquisition of an Australian logistics firm, sources said.

Toll Holdings is reeling from declining parcel volumes sparked by a drop in Australia's natural resource prices, the sources said Thursday. The potential loss could affect the Japanese government's plan to sell its stake in the postal giant, which also has banking and insurance units.

The development marks the latest example of losses chalked up by Japanese firms that have embarked on overseas expansions, including Toshiba, whose U.S. nuclear unit Westinghouse filed for bankruptcy protection last month.