"The volatile global situation shows why it's important that we are managing the Government's finances carefully by running surpluses and keeping expenses and debt under control," Finance Minister Grant Robertson said in a statement.
"Our domestic economic situation is reflected in the Crown accounts. Corporate tax receipts in the six months to December were 9.8 percent higher than a year ago, highlighting strong underlying business fundamentals."
Robertson is working towards his first 'well-being' budget in May, which hasn't perturbed global ratings agencies which see the new measures as shifting spending priorities rather than undermining fiscal prudence. That discipline prompted Standard & Poor's to raise its outlook on the sovereign rating to 'positive', meaning there's a chance of an upgrade in coming years.
While the operating balance was in surplus, the Crown's cash deficit of $7.26b was $501m more than anticipated, as capital spending occurred earlier than Treasury officials predicted.
Net debt was $64.15b, or 22.1 percent of GDP, marginally more than the $64.06b, or 22 per cent of GDP, predicted.
The government's operating balance, including $3.1b of investment losses made by entities including the New Zealand Superannuation Fund and Accident Compensation Corp, was a deficit of $5.61b.
Changes in the discount rates to calculate ACC's long-term claims and the Government Superannuation Fund's long-term liabilities drove $3.7b of losses on non-financial instruments which also weighed on the balance.
The Crown's net worth was $124.5b, some $6.29b below forecast, although up from $114.09b a year earlier.