The WACC of Biogen Inc (BIIB) is 8.0%.
| Range | Selected | |
| Cost of equity | 7.90% - 10.90% | 9.40% |
| Tax rate | 13.90% - 16.80% | 15.35% |
| Cost of debt | 4.00% - 4.60% | 4.30% |
| WACC | 6.8% - 9.2% | 8.0% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.87 | 1.07 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 7.90% | 10.90% |
| Tax rate | 13.90% | 16.80% |
| Debt/Equity ratio | 0.3 | 0.3 |
| Cost of debt | 4.00% | 4.60% |
| After-tax WACC | 6.8% | 9.2% |
| Selected WACC | 8.0% | |