So far this is what I see in Wisconsin, There are a variety of qualifications for a Wisconsin Homestead Credit. Those who qualify must be 18 years old as of December 31 of applicable year, lived in Wisconsin for the entire year (January 1 to December 31), claim independent on taxes and make under $24,500 (as of 2009).
So the difference is that if you live in Illinois, it goes by age, in Wisconsin for the most part it goes by income. I do also believe the state of WI allows for a credit no matter if you own or rent.
Read more: Wisconsin Homestead Act | eHow.com http://www.ehow.com/facts_6374137_wisconsin-homestead-act.ht You can go to ehow and look up Illinois Homestead information also.