The objective of this paper is to obtain the growth optimizing public debt to GDP ratio (d*), based on estimated output elasticity (α) of public sector capital under the golden rule of budgetary deficit. After conducting unit root tests and cointegration analysis, value of α which is estimated under OLS, CLS and FMOLS, hovers around 0.281–0.29. Hence, the computed value of d* stands around 65–67% of GDP; modestly lower than the current value (73% in 2016). Since large revenue deficit has been persisting, effective value of d* would be even lower. Fiscal tightening, especially reducing revenue deficit and offloading the persistently loss making PSUs would be important for macroeconomic stability and accelerating economic growth.