The Obama administration is issuing new rules that extend overtime pay to 4.2 million US workers.
The new regulation affects full-time salaried employees that make up to $47,476 a year. That more than doubles the current salary range at which companies can deny overtime.
The biggest impact is expected to affect retail and restaurant industries where managers are often paid just slightly more to work longer hours and supervise their fellow employees.
Officials say an estimated $12 billion will be earned by salaried workers over the next decade.
Opponents have concerns over the rule which they believe will force hours and wages to be cut.