Payroll Software by Medlin - Medlin Payroll Version 4.1, Revision 15 includes an updated default percentage for AZ State withholding. To install the latest revision of Medlin Payroll Software, go to www.medlin.com and click the "Download & Install Program" button.
http://www.revenue.state.az.us/Newsroom/Releases/SB-1185-Withholding-Q-A.pdf