The WACC of Biogen Inc (BIIB) is 8.2%.
| Range | Selected | |
| Cost of equity | 8.00% - 10.30% | 9.15% |
| Tax rate | 13.90% - 16.80% | 15.35% |
| Cost of debt | 4.00% - 4.80% | 4.40% |
| WACC | 7.2% - 9.1% | 8.2% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.91 | 0.98 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.00% | 10.30% |
| Tax rate | 13.90% | 16.80% |
| Debt/Equity ratio | 0.23 | 0.23 |
| Cost of debt | 4.00% | 4.80% |
| After-tax WACC | 7.2% | 9.1% |
| Selected WACC | 8.2% | |