The number of Kiwi kids in poverty jumped by 60,000 in the recent global recession - twice as much as previously reported.
Revised figures show that children in homes with under 60 per cent of the median income after housing costs, usually cited as New Zealand's poverty line, leapt from 240,000 in 2007 to 300,000 in 2010, the highest since 2001.
The number has dropped back since then to 285,000, but this is still 20,000 more than the previously reported figure of 265,000.
The revisions, disclosed today, are mainly because the accommodation supplement was double-counted in all estimates of after-tax income reported by Statistics NZ, Treasury and the Social Development Ministry since 2009-10.
A joint statement by Treasury and Statistics NZ said the figures were produced jointly by the two agencies and "neither agency had an overview of the complete process to ensure the anomalies, once identified, were properly explained."