The Effective Tax Rate is not as simple as that, and is not intended to be. You may have some income that was taxed at 15%, some at 20%, etc. It is just an 'average'.
Although the figure is "nice to know" since we have a graduated income tax system it is really not part of the income tax return so although TT gives you the number they do not show you the computation.
Click this link for more info on Effective Tax Rate.
Here's more discussion on Effective Tax Rate noting various ways of calculating.
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