The WACC of Williams Companies Inc (WMB) is 6.6%.
| Range | Selected | |
| Cost of equity | 6.60% - 8.40% | 7.50% |
| Tax rate | 23.90% - 26.20% | 25.05% |
| Cost of debt | 5.00% - 6.10% | 5.55% |
| WACC | 5.9% - 7.3% | 6.6% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.6 | 0.63 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 6.60% | 8.40% |
| Tax rate | 23.90% | 26.20% |
| Debt/Equity ratio | 0.38 | 0.38 |
| Cost of debt | 5.00% | 6.10% |
| After-tax WACC | 5.9% | 7.3% |
| Selected WACC | 6.6% | |