Purchase Agreement- purchase price differs / escrow is less

[Mark Tomsick]

I signed a purchase agreement to sell a property for 490,000. It was written that my total proceed would be 250,000 less any taxes etc.  Buyer stated that he needed to state the higher number so the hard money lender would finance. 

-Will I be taxed for the 450,000 (3.3 rule) before escrow releases funds?

-What may be other reasons for the differing sales price to my "proceeds"