According to the IRS, "A corporation with a fiscal year that includes Jan. 1, 2018, will pay federal income tax using what is called a blended tax rate. Then calculate their tax using the new 21 percent rate. Proportion each tax amount based on the number of days in the taxable year when the different rates were in effect." Here is an IRS link that explains this concept.
if you are an individual, then you may be thinking about effective tax rate. This is a tax rate that takes into account long-term capital gains and ordinary income. These are taxed at different tax rates and when you combine the two, the effective tax rate is the result.,
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
