This study investigates capital structures of Australian firms in relation to firm characteristics. Using an unbalanced panel of 367 firms observed over a 15‐year period from 1992 to 2006, our panel data regression results show that debt–asset ratio is positively related to asset tangibility but inversely related to growth prospects and business risk measured by unlevered beta of equity. We also find that although levered firms are generally more profitable than unlevered firms, profitability decreases the debt ratio of levered firms. We do not find that firm size affects the capital structure of Australian firms. These results are consistent with the pecking order and the agency cost theories but contradict the trade‐off theory.Capital Structure, Asset Tangibility, Growth, Business Risk, Profitability, G32,

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