Employers should be aware that as of November 1, 2009, they will be required to use a new state income tax withholding table, which increases  by 10% the amount of income taxes withheld based on existing claimed exemptions by the the employee.

For example, if state income tax withholding is currently $400 a pay period on an employee’s regular wages, come November 1st , the withholding will increase to $440.

Payroll departments should be prepared to receive employee inquires and amended w-4 forms after the effective date.

This new change was part of legislation (ABX4-17) signed by the Governor to assist in accelerating tax collection due to the budget crisis at the State level (I know,  not just at the State level).

Littler has a more exhaustive posting on the topic here if you would like more information on this tax issue.