primary reason: we have a "voluntary" tax system....which means you "claim" your expenses....
secondary reason....your "wage earners expenses" associated with their pay/income were already deducted at his/her job....
1) a family produces nothing for profit; the family sdoes not provide society with any real goods or services.... therefore, it generates no revenue .....it only spends money.....
2) most people spend more than they earn....hence, the "debt & credit crisis"....and from that vantage point it's easy to see there would be no taxes due by the family...all monies earned would be claimed as a loss/expense.
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