Having lived in Illinois I can tell you that the state income tax is now about the same (with the recent tax hike in Illinois), depending on where in Lake County you live, property taxes will most likely be higher. Lake County has a food tax where Kenosha county does not. I'm not sure, but the utilities may be a little higher in Lake County. At one time Lake County was much more expensive to live in than Kenosha County, but they are about the same with Illinois being slightly higher in my opinion. If it's possible to live just over the line in Wisconsin, you may be better off. If you are planning on living in southern Lake County, you could be closer to your workplace and you would save time in the commute. But...gas is less expensive in Wisconsin so it may be a wash.