The requirement that an employee must retain all tips does not preclude a valid tip pooling or sharing arrangement among employees who customarily and regularly receive tips, such as waiters, waitresses, bellhops, counter personnel (who serve customers), bussers, and service bartenders.

A valid tip pool may not include employees who do not customarily and regularly receive tips, such as dishwashers, cooks, chefs, and janitors.
such as an employee employed both as a maintenance person and a waitperson, the tip credit is available :

• Where an employee does not receive sufficient tips to make up the difference between the direct (or cash) wage payment (which must be at least $2.13 per hour) and the minimum wage, the employer must make up the difference.

• Where an employee receives tips only and is paid no cash wage, the full minimum wage is owed.

• Where deductions for walk-outs, breakage, or cash register shortages reduce the employee’s wages below the minimum wage, such deductions are illegal. When an employer claims an FLSA 3(m) tip credit, the tipped employee is considered to have been paid only the minimum wage for all non-overtime hours worked in a tipped occupation and the employer may not take deductions for walkouts, cash register shortages, breakage, cost of uniforms, etc., because any such deduction would reduce the tipped employee’s wages below the minimum wage.

• Where a tipped employee is required to contribute to a tip pool that includes employees who do not customarily and regularly receive tips, the employee is owed the full $7.25 minimum wage and reimbursement of the amount of tips that were improperly utilized by the employer.