The WACC of Marathon Petroleum Corp (MPC) is 8.2%.
| Range | Selected | |
| Cost of equity | 8.10% - 12.70% | 10.40% |
| Tax rate | 19.50% - 21.20% | 20.35% |
| Cost of debt | 4.20% - 4.90% | 4.55% |
| WACC | 6.5% - 9.8% | 8.2% |
| Category | Low | High |
| Long-term bond rate | 4.2% | 4.7% |
| Equity market risk premium | 5.0% | 6.0% |
| Adjusted beta | 0.78 | 1.26 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.10% | 12.70% |
| Tax rate | 19.50% | 21.20% |
| Debt/Equity ratio | 0.49 | 0.49 |
| Cost of debt | 4.20% | 4.90% |
| After-tax WACC | 6.5% | 9.8% |
| Selected WACC | 8.2% | |