On the spending side, a 1.9 per cent increase in the biggest line item - social security and welfare - is entirely explained by a $276 million increase in New Zealand Superannuation payments.
Spending on healthcare was running at 1.8 per cent or $100 million ahead of the same period in 2012, while a similar dollar increase in education spending represented a 2 per cent increase.
Overall core Crown expenses were 1.3 per cent higher than at the same point in the last fiscal year.
Labour's finance spokesman David Parker said corporate tax revenue falling below forecast meant companies were not making as much money as expected.
"That means the economy isn't going as well as John Key and Bill English like to trumpet. If the economy truly is a rock star then it's having a Justin Bieber moment," he said.
But Finance Minister Bill English said the Treasury believed most of the revenue difference from its forecast was due to timing issues and would reverse out in coming months.
"We remain on track to surplus in 2014/15 but, as we have said many times before, this remains quite a challenge. In particular, we need to remain focused and disciplined and now is certainly not the time to get loose with spending."