In New York, the sale of whole bagels isn't subject to sales tax. But the tax does apply to "sliced or prepared bagels (with cream cheese or other toppings)," according to the state Department of Taxation and Finance. And if the bagel is eaten in the store, even if it's never been touched by a knife, it's also taxed.You get taxed for wanting lox and a schmear? Is there a tax for slicing open pita at the falafel stand? Do the goyim get charged extra for sliced white bread?
Update: GDE in comments: "First they came for the transfats...." Heh.
