Lansing. Governor Snyder signed into law a bill mandating that certain online retailers are to begin charging the state’s 6% sales tax for purchases made by Michigan residents.  The law requires online retailers that maintain a physical presence in Michigan to participate.  The new tax would presumably generate $60 million in tax revenue to the state.  This will only put a small dent into the approximate $325 million budget deficit that the Michigan Department of Treasury is expecting in the state’s 2015 general fund.  Some retailers such as Meijer and Walmart have already been collecting the new sales tax for Michigan.  The new law will take effect October 1st.