The lure of Australia continued to keep the departure lounges busy last month.
Overall, there was a net outflow of 660 migrants, seasonally adjusted, Statistics New Zealand said, reversing June's net gain of 520.
It pushed the annual tally to a net loss of 3800, compared with an average net gain of 16,300 a year over the previous 10 years.
The number of departees for Australia last month was 4337, 90 per cent of them New Zealand citizens, while 1145 came the other way, two-thirds of them returning New Zealanders.
For the year ended July, the gross outflow of permanent and long-term migrants was 87,475, up 7 per cent from the year before, the majority of whom (48,737) were New Zealand citizens leaving for Australia.