The WACC of Biogen Inc (BIIB) is 7.8%.
| Range | Selected | |
| Cost of equity | 7.40% - 11.00% | 9.20% |
| Tax rate | 13.90% - 16.80% | 15.35% |
| Cost of debt | 4.00% - 4.60% | 4.30% |
| WACC | 6.4% - 9.2% | 7.8% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.76 | 1.09 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 7.40% | 11.00% |
| Tax rate | 13.90% | 16.80% |
| Debt/Equity ratio | 0.33 | 0.33 |
| Cost of debt | 4.00% | 4.60% |
| After-tax WACC | 6.4% | 9.2% |
| Selected WACC | 7.8% | |