This research seeks to determine the influence of investment opportunity set (IOS); profitability (Return on Assets - ROA), liquidity, business risk and firm size on debt policy. We used 42 manufacturing companies registered on the Indonesian Stock Exchange (Bursa Efek Indonesia) as object research. We used purposive sampling method to determined samples, consider the period observation from 2012 to 2016, and produce 168 units analysis. Data analysis uses the multiple regressions with the SPSS tools. The results of the study found that companies’ debt policies in Indonesia are negatively affected by the liquidity. Investment opportunity set (IOS) has negative effect on debt policy. Meanwhile, ROA, Return on Invested Capital (ROIC), and firm size of a company has no impact on debt policy. These findings indicate that Indonesian manufacture companies do not see the high investment opportunity set and profitability as a policy basis for increasing debt. Moreover, the high profitability also does not cause companies to increase their debt ratio. Our study indicates that Indonesian manufacture companies use internal funds to fund their investment. This finding is a concern for creditors, as they can now see the ability of the companies, and especially their performance, in determining their credit policies.

Abstract
1. Introduction
2. Literature Review
3. Research Methods and Materials
4. Results
5. Discussion
6. Conclusions
References

• Saparuddin MUKHTAR(Economics Education Department, Faculty of Economics, Universitas Negeri Jakarta)
• Denis Opi MAHARIN(Accounting Department, Faculty of Economics, Universitas Negeri Semarang)
• Subowo SUBOWO(Accounting Department, Faculty of Economics, Universitas Negeri Semarang)
• Hasan MUKHIBAD(Accounting Department, Faculty of Economics, Universitas Negeri Semarang) Corresponding Author.