The fall was due to the company having to write off a total of $227.4 million due to the cancellation of its mobile network rollout.
Announced in January, TPG blamed the cancellation of its plans on a government ban on using gear from Chinese telecommunications equipment vendor Huawei Technologies for 5G networks in Australia.
Total revenue for 1H19 came in at $1.24 billion, a fall of $1.5% compared to the $1.25 billion in 1H18.
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The 1H19 results also included a $4.4 million one-off transaction cost due to its planned merger with Vodafone Hutchison Australia, announced in August last year.
In December, the Australian Competition and Consumer Commission expressed some reservations about the merger, saying it would lessen competition in the mobile sector.
TPG said it expected the ACCC decision in relation to the application for informal clearance of the merger to be made in May.