There are a number of studies that show both the impact on the physical & mental health of employees, as well as their productivity at work. The PwC Employee Financial Wellness Survey is a great resource (with international figures) and locally, the Momentum Effective Employee Index has some great stats too. A survey commissioned by the American Psychological Association created a great infographic on the effects of financial stress and this article by Forbes gives a great overview of how financial stress impacts physical and mental health.