The WACC of Old Second Bancorp Inc (OSBC) is 6.5%.
| Range | Selected | |
| Cost of equity | 7.20% - 9.20% | 8.20% |
| Tax rate | 26.00% - 26.30% | 26.15% |
| Cost of debt | 5.00% - 5.00% | 5.00% |
| WACC | 5.8% - 7.1% | 6.5% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.72 | 0.77 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 7.20% | 9.20% |
| Tax rate | 26.00% | 26.30% |
| Debt/Equity ratio | 0.62 | 0.62 |
| Cost of debt | 5.00% | 5.00% |
| After-tax WACC | 5.8% | 7.1% |
| Selected WACC | 6.5% | |