Badly, and in a manner designed to deceive.
Rather like the fair tax proposition, come to think of it.
If a principle argument of yours is something along the lines that, ''We define rates just like the IRS (or more simply, or however you choose to frame the comparison)'', then that's no argument at all. Somewhat like saying, ''See, dying of dysentery isn't any worse than dying of typhus.''
pfft, yourself. Your first sentence was spot on, until you added the last two words.
Ta-ta.
For ‘principle’, please read ‘principal’. Apols for the typo.
It is not an argument of mine. Mine is to use both rates, depending on usage. I have no problem using either.