Operating income includes all the revenues and expenses related to operating activities (i.e., the company’s core business). EBIT is operating income plus all other revenues and expenses exclusing interest expense and tax expense. So, let’s say that Company A has a minority stake in Company B, and that Company B pays Company A a dividend. This dividend is not related the Company A’s core business, so it is not in operating income. However, it is included in EBIT, as some kind of investment income. Usually, I view a big discrepancy between operating income and EBIT as a red flag as ultimately, a company should generate the bulk of its profit from its core business.