Selling expenses can include transfer taxes, stamp taxes, sales commissions paid to a real estate agent, any fees for a service that helped you sell your home without a broker, advertising fees, legal fees, and any mortgage points or other loan charges you paid that would normally have been the buyer's responsibility.
See
https://www.irs.gov/publications/p523/ar02.html#en_US_2015_publink100010379 for more information.
