Creative Financing - is it legit ?????

I’m selling a home in Florida for well below market price. I found a buyer who wants to buy at my appraised price. However, he wants cashback from my original listing price and the appraised price (equaling almost $80K ). Other than documenting the HUD, can this deal work if I were to give him a check and get something in writing???
I want to make sure I won’t be liable for paying any taxes on the captial gains. (no lender will approve that much amt on the HUD)

Thanks…any help would be greatly appreciated.

Creative financing is legit – this guy is not. RUN! . . . then find another buyer.

Da Wiz