I have been going to garage sales for a long time, however I've never tried to sell my items (other than personal items) on craiglist.  I've sold a few items on Ebay, but thought Craigslist might be a good way to go to start sellings I could pick up at garage sales. This might a total newbie question, when posting the ad on craiglist, do you say you are business?  Also, do you take sales tax out of the total amount you collect and if so, do you give the buyer any kind of receipt?   I want to make sure I represent myself correctly and also pay the appropriate taxes.  would love to hear about your experience!