The Government books are on track to deliver the promised surplus in 2014 - 15, but at $86 million, still a very small one despite improvements in the economy.
Finance Minister Bill English at the half-yearly update of Budget forecasts described as a "paper-thin" surplus and said it would still be a challenge.
The May Budget forecast a surplus of $75 million so the improvement is only $11m better.
But with growth forecasts set to peak at 3.6 per cent in the March 2015 year, the surpluses will grow in the following years to $1.7 billion, $3.1 billion and then $5.6 billion.
Mr English said that there was still a lot of work to do to make the forecasts a reality and the Government was this year still borrowing a net $78 million every week.