The Treasury forecast an Obegal deficit of $572 million in the year ending June 30, 2015, turning to a surplus of $565 million the next year.
Finance Minister Bill English last week said public-sector wages would remain in check after the annual pace of inflation fell below the Reserve Bank's target band of between 1 per cent and 3 per cent, capping expectations for future salary hikes.
Slow inflation has spurred the prospect of interest rates remaining lower for longer, which reduces expected returns on government bonds. As a result, the Accident Compensation Corp reported an actuarial loss of $2.02 billion, which was $706 million ahead of forecast.
That weighed on the Crown's operating balance, which includes fair value adjustments in its investment portfolio and actuarial movements, which was a deficit of $1.31 billion in the five-month period, $466 million wider than forecast.
The Crown reported an operating surplus of $2.26 billion a year earlier as it benefited from fair value gains in the investment portfolios of ACC and the New Zealand Superannuation Fund.
ACC's insurance liability was $31.47 billion as at November 30, $832 million more than forecast, while the Earthquake Commission's property damage liability was $333 million more than expected at $3.9 billion.
The Government's net debt was $220 million smaller than expected at $62.64 billion, or 26.5 per cent of gross domestic product, and 5.1 per cent higher than a year earlier. Gross debt was $782 million more than expected at $85.36 billion, or 36.1 per cent of GDP, due to a number of unsettled trades, and was up 2.6 per cent from a year earlier.
The Crown's residual cash deficit was $3.24 billion, $40 million more than forecast, and smaller than the $4.01 billion a year earlier.