The life insurance persistency rate or customer retention rate for the combined business is 90.4 per cent and 2 per cent higher than the industry average.
AMP NZ managing director Jack Regan said the results reflected resilience in difficult times.
"Despite unprecedented challenges in the market, the result, when adjusted for one off impacts, compares favourably to last year's," he said in a statement.
The company is involved in superannuation, personal insurance, retirement incomes, retail managed funds and financial advice in Australia, and in workplace superannuation and retail managed funds in New Zealand.
In Australia, the parent company AMP reported a net profit of A$688 million for the year, including nine months' contribution from AXA, compared with a profit of A$775m in the previous year. The result also included merger transaction and integration costs.
AMP said its underlying profit - which removed merger-related costs and some of the impact of investment market volatility - was A$909m in 2011 compared with A$760m in 2010.
AMP is the largest non-bank wealth manager in Australia and New Zealand.