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Understanding taxes when buying goods at a store
Grocery food is not subject to sales tax in Maryland, but some food is taxed depending on category or preparation. So you must have had a combination of grocery and taxable foods. One of the cheaper items you purchased was subject to a whopping penny of sales tax. http://taxes.marylandtaxes.com/Individual_Taxes/Taxpayer_Assistance/Individual_Tax_FAQs/Use_Tax_FAQs/q4.shtml In general, food sales are subject to Maryland's 6 percent sales and   use tax unless a person operating a substantial grocery or market   business sells the food for consumption off the premises and the food   is not a taxable prepared food. A grocery or market business is   considered to be "substantial" if the sales of grocery or market food   items total at least 10 percent of all food sales.