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1. What is business income?

Michigan defines business income as all income arising from transactions, activities, and sources in the regular course of the taxpayer's trade or business. Business income includes a taxpayer’s distributive share of income or losses reported on a federal schedule K-1, including portfolio income.  Portfolio income includes interest income, dividend income, royalty income, and net short-term and long-term capital gains (losses) to the extent included in federal adjusted gross income.  Rental income is also considered business income if it is determined to be an integral part of the taxpayer’s trade or business.  The statutory definition of business income can be found in MCL 206.4