Governor Sonny Perdue says net revenue collections for the month of June dropped by almost 16% from the same month a year ago.
The governor says that for the fiscal year, the decline was 10.5%.
Figures released by the governor's office show revenues for last month of $1,364,350,000 compared with $1,618,879,000 for June 2008, a decrease of more than $250 million.
Declines were seen in collections from income tax, sales tax and motor fuel tax.
Worsening revenues have forced state agencies to make substantial budget cuts and to furlough workers.