Finance Minister Bill English still believes he will be able to get the Government's books back into the black this year, but says it will be a challenge.
The Treasury's pre-election economic and fiscal update (Prefu) three months ago forecast a wafer-thin surplus of $300 million for the 2014/15 year.
But at 0.4 per cent of government revenue that is well within the margin of error for a figure that is the difference between two very large numbers, revenue and expenditure, with a lot of moving parts.
Since then export prices for dairy products have continued to fall, reducing spending power in the economy by billions of dollars compared with last season. And inflation in NZ, as in most of the rest of world, has been running at very low rates.