Rich means you don't have to go to work in the morning, and your time is your own. It means not having to worry about losing your job. It means not wondering how many paychecks you are away from losing your house. Strong cashflow is not rich, just good payday to payday living, subject to interruption.
A retarded man once told me this little poem:
"A sonofabitch fell down in a ditch,
found a penny and thought he was rich."
Clearly, this retard was a genius.
Nope. No income for sources derived outside of the U.S. or in the District of Columbia or those territories where the feds have sole authority = no income tax. I have never seen any listed source in IRC/USC 26 which would indicate that regular work income within the 50 states (other than income derived from the sale or manufacture of Alcohol, Tobacco, or Firearms) is subject to an excise tax (what the income tax was ruled by the Supreme Court).