Waking up a slumbering thread.

Over here, the payment terminals nowadays almost always
ask about leaving a tip, but when they do I don't tip. If they don't, then I will consider rounding up the total a little bit depending on how I appreciated the service and the food.
It needs to be said that the wages paid here are fair so the staff does not rely on tip for their income. When in the US I follow the normal procedures, aka 15-20% tip - the staff does not work for free and they need their wages paid via tipping. I try to follow whatever customs in the places I visit, beacuse it is the decent thing to do.
EDIT: That applied regardless of whether I got reimbursed or not. I could afford some tipping even if not reimbursed, when I travelled for business.