Taxation using PP G&S

Can anyone tell me how much you get dinged on your taxes for selling gear through PP G&S?  I just had to give my SS# for tax purposes on a $2k sale.  Not happy about it.  First large PP deal.  Now I have another buyer insisting on G&S (for a $200 item!).  This is partly why I try to stay 100% local selling and buying.  I get it, buyers want some kind of reassurance on the deal.  

But, is the taxiing nothing to worry about? 

I'm hoping some sellers with more experience than I can shed some light.  I did some quick searching but couldn't find any concrete answers.

Thanks