IAG revealed how the Canterbury situation was tougher than it had initially forecast.
"Increased complexities have pushed expected completion date out to mid-2016 [previously December 2015]," the company said.
IAG's bigger parent company pushed up profits 10.6 per cent from last year's A$1.43 billion to make A$1.58 billion in the year to June 30.
IAG, with operations here, in Australia, Thailand and Vietnam, owns some of this country's biggest insurance brands including State Insurance, NZI, Lumley Insurance and AMI.
A statement from the company to the ASX, where it is listed, detailed performance here.
"New Zealand's performance remained strong. Local currency gross written premiums grew 3.7 per cent, reflecting improved volumes from customer and sales initiatives, as well as rate increases on home insurance to recover higher reinsurance costs," the company said.
"Reported margin rose to 11.5 per cent [FY13: 8.9 per cent] despite the impact of a number of heavy rain and storm events which led to natural peril claim costs being well above the related allowance. The underlying margin improved to 14.8 per cent."
IAG's New Zealand chief executive Jacki Johnson said the New Zealand result reflected the good momentum in this country's economy, disciplined underwriting and pricing in a competitive market and a strong focus on delivering positive customer experiences.
She said that underlying profitability was expected to remain strong as IAG focused on improving operational efficiencies.
"Settling claims relating to the Canterbury earthquakes continues as our most pressing priority, while considerable attention is also being given to welcoming Lumley employees and customers into IAG and leveraging the strengths of both businesses," Johnson said.
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