This research examined the influence of asset structure, profitability and tax to capital structure. The research objects were trading companies listed in the Indonesian Stock Exchange period 2011-2016. The selected samples using purposive sampling consisted of 40 companies. The analysis tool used in this research was multiple linear and panel data regression with Eviews 9 as the analytical application. The results obtained in this study are: 1) asset structure has postive effect significantly on capital structure, 2) profitability has negative effect significantly on capital structure, 3) tax has a negative effect significantly on capital structure.