Answered By: Matthew Coan Last Updated: Jul 14, 2015 Views: 69
The best resource we have on that subject is The employer's legal handbookby Fred Steingold. We have a 2005 edition in print, and there are also electronic copies available through our catalog (the most recent edition electronically available is 2007, so I'm not sure there are substantial differences for your topic).
The South Central (public) libraries also have a resource called: Federal withholding tables with highlights effective 2009. It is also an electronic resource.
I know very little about the topic, but I think both might help!
Call me if you need more assistance getting either of these! 246-6639
You should also look here: http://www.irs.gov/individuals/article/0,,id=96196,00.html
The IRS has an online calculator, ALSO look at the bottom of this list of publications from the state: http://www.revenue.wi.gov/html/taxpubs.html