From the press release:
States that collect personal income taxes continued to suffer sharply declining revenues as the April 15 deadline for filing tax returns delivered troubling news, according to a Rockefeller Institute of Government report issued today.
The report — “April Is the Cruelest Month” — examined January to April tax collections for 37 of the 41 states that impose broad-based personal income taxes. It showed an overall decline of 26 percent, or $28.8 billion, when compared to the same period a year earlier. April income-tax collections were even worse than those in the preceding quarter, with a drop-off of $18.2 billion when compared to April 2008. April is the month during which states collect the most income tax revenue, because of the filing deadline.