Last month, the Treasury said it expected corporate tax to grow by some $400 million in the final quarter of the year after stronger corporate earnings.
The Crown is forecast to run an annual operating deficit of $8.44 billion, with a further two years in the red before returning to a wafer-thin surplus of $197 million in the 2015 financial year.
That assumes New Zealand's net migration turns positive in the 2014 year as the country's economy outperforms Australia and the Christchurch rebuild attracts workers from overseas. It also predicts productivity growth of about 1.4 per cent a year over the next four years, rising interest rates from next year, and a falling exchange rate.
Yesterday, the Treasury stuck by its budget forecasts in its monthly economic indicator, saying its base-case scenario "remains valid" despite the deterioration in Europe's financial stability.
The Canterbury Earthquake Recovery Authority spent $52 million less than expected due to delays in demolition work and smaller costs incurred from the acquisition of red-zone properties in Christchurch. The Government's provision for its Canterbury Red Zone support package was 0.4 per cent more than forecast at $473 million.
Net debt was $595 million less than expected at $52.03 billion, or 25.9 percent of gross domestic product, due to a smaller cash deficit as at April 30.