The latest crown accounts show the government is continuing to pull in less tax than it forecast in this year's budget due to the recession.
The government accounts for the four months ending October recorded tax revenue as $15.4 billion which was $1.6 billion (9.4%) lower than forecast.
Treasury said lower business profits were hitting the government's books and this flowed through into a lower tax take in 2010.
"Recent 2008/2009 financial year results for public-listed companies indicate that weakness in corporate profitability has occurred across a broad range of sectors," Treasury said.
"This shortfall against the Budget Update in provisional tax is expected to carry through to year end, but is not expected to increase over this period."
The $1 billion (39.7%) reduction in corporate tax take compared to forecasts was also matched by individuals' tax revenue being down $346 million.
Treasury said there had been greater than expected refunds due to repayment of overpaid provisional tax, more requests for refunds and increased donation and childcare credits.
These hits to revenue resulted in the operating balance before gains and losses rising to $3.27b, which was $1.2b worse than the forecast $2.04b or 59%.
This was offset by higher than forecast investment returns from the New Zealand Superannuation Fund ($1.3b) and ACC ($0.6b).
These greater than expected returns meant the headline operating balance was only slightly worse than the forecast $1.3b.
The government's cash deficit also improved from $4.1b to $3.9b due to some higher than forecast dividends from state owned enterprises and other cash receipts.
