The WACC of Williams Companies Inc (WMB) is 6.4%.
| Range | Selected | |
| Cost of equity | 6.50% - 8.30% | 7.40% |
| Tax rate | 23.90% - 26.20% | 25.05% |
| Cost of debt | 5.00% - 6.60% | 5.80% |
| WACC | 5.6% - 7.2% | 6.4% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.58 | 0.62 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 6.50% | 8.30% |
| Tax rate | 23.90% | 26.20% |
| Debt/Equity ratio | 0.49 | 0.49 |
| Cost of debt | 5.00% | 6.60% |
| After-tax WACC | 5.6% | 7.2% |
| Selected WACC | 6.4% | |