It’s wise to include the real estate taxes into your monthly budget, so that the end of the year, or at the start (whatever the case may be in the State you reside), these won’t be too much to handle all at once. The rate for real estate taxes in Wisconsin is 2.09%.
Source: NY Times article titled: State-by-State Property Tax Rates, published April 10, 2007. Consult the Division of State and Local Finance for more information.