While tipping is not mandatory in most of the United States, it is customary in many circumstances for service, especially at almost all sit-down restaurants which offer table service and many food servers depend on tips as an essential part of their wage. Some states allow a "tip credit" to count as part of the Federal Minimum Wage of $7.25/hour so tipped employees may be paid as low as $2.00 an hour plus tips. Generally, the average tip is 15% to 20% of the total meal cost.