Further to my last post:
If your total tax, line 24 is higher than line 16, your true effective rate is higher than Turbo Tax's computed effective rate, and the higher rate may be needed for tax and investment planning (like comparing the after-tax returns of bond funds and other investments). It depends on the entries between lines 16 and 24, (like net investment income tax) and whether they are likely to be repeated in the following year.
