Wage theft is almost never reported by its victims—the workers who are deprived of legally-entitled wages. It is therefore difficult to measure. A widely-cited 2014 estimate by the Economic Policy Institute, which advocates for the needs of lower-income workers, put the figure at as high as $50 billion a year.
In 2017, the institute estimated that 2.4 million workers in the 10 most populous states lost $8 billion annually to just one form of wage theft, employer violations of minimum-wage laws. Other common forms of wage theft include non-payment of overtime, not paying a worker for all of the hours they've worked, not giving workers their last paycheck and refusing to pay workers altogether.
A 2014 report prepared for the Labor Department documented as much as $20.1 million of wage theft per week in New York and as much as $28.7 million of wage theft per week in California.