Here is an experiment for you to do. Go ask 50 people "how much do you earn?"
Better than 95% will respond "I take home $X" or some close variant of that.
I did mortgages for 10 years. One of the hardest questions to get answered accurately was "gross monthly income". Hardly anyone knew.
But they could all tell me exactly how much their take home pay was.
What about people making minimum wage today? Do you lower mw to reflect the embedded tax, or do you raise it to accommodate? Because even though today, the majority of people making mw do not pay income taxes, the are still taken out, just refunded at a different time.
Maybe I am reading your argument all wrong, I am not a follower of fair tax with the exception of reading an occasional post, I am not necessarily against it, I just found a gaping flaw in your argument that I wanted to point out. Please correct me if I misunderstood.