Mckell Institute has discovered 1 in 5 Queensland workers are likely victims of wage theft - targeting vulnerable employees such as young people, people with disabilities, migrants and international students.

A report due to be released on Monday found least 437,000 Queenslanders, were likely to have not been paid their full wages and entitlements, not including superannuation.

Mckell found wage theft was occurring in numerous ways, including pressuring workers not to claim overtime or take paid meal breaks, or not paying staff current award wages.