We explore optimal health subsidies in a dynastic model with health externalities to productivity that cause low health spending, productivity, longevity, savings and labor but high fertility. Public or firms’ health subsidies increase health spending, longevity and productivity and decrease fertility. Labor income taxes reduce the marginal benefit of health spending and the time cost of raising a child, while consumption taxes reduce the relative cost of raising a child. Appropriate public or firms’ health subsidies can internalize the externalities through age-specific labor income taxes and consumption taxes. Calibrating the model to the Australia economy, numerical results suggest policy improvements.