While it’s free to list items for sale on Poshmark, after the sale, a set fee of $2.95 is deducted from sales under $15. For sales above $15, a 20% fee is deducted, leaving you with 80% on the final sale price of the listed item.  So, for instance, if you had an item for sale for $100, Poshmark would take $20, and you would keep $80.