More people arrived on a permanent or long-term basis in March than left, making it only the second month since the earthquake in February last year that the net flow of migrants has been positive.
There was a net inflow of 130 people, Statistics New Zealand said, at least on a seasonally adjusted basis.
The unadjusted number was a net outflow of 1342.
ASB economist Jane Turner said a dip in seasonally adjusted permanent departures appeared to be due to unusually low departures to Europe.
"It is unclear if this is a temporary blip ... or the start of a weaker trend reflecting the economic difficulties in the region."