All eligible MBT returns prepared using software must be e-filed. E-file information is available at www.MIfastfile.org. All 2009 MBT forms and instructions are also available on the MBT forms page.

For the 2009 tax year, the Michigan Department of Treasury will not be mailing Michigan Business Tax instruction books (standard taxpayers, financial institutions, or insurance companies) to MBT taxpayers. 2008 MBT forms and instructions were mailed as it was the inaugural year for the tax.

Michigan will not begin accepting MBT e-file returns until January 25, 2010, and therefore, will begin issuing acknowledgments for MBT e-file returns on January 26, 2010.