I agree with the comment that the effective rate has been wrong for years. To me the effective rate should be either my total tax paid / total income or my total tax paid / AGI or my total tax / taxable income. This year TT says 17.99 for me but it is really 21.74 or 21.77 or 25.22 depending on which number I use for the denominator. I had a large AMT one year yielding a 57.9% effective tax rate, but TT reported a much lower effective rate. It makes no practical sense.
