The WACC of Marathon Petroleum Corp (MPC) is 7.9%.
| Range | Selected | |
| Cost of equity | 8.70% - 11.70% | 10.20% |
| Tax rate | 19.20% - 20.90% | 20.05% |
| Cost of debt | 4.20% - 4.90% | 4.55% |
| WACC | 6.8% - 8.9% | 7.9% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 1.06 | 1.22 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.70% | 11.70% |
| Tax rate | 19.20% | 20.90% |
| Debt/Equity ratio | 0.56 | 0.56 |
| Cost of debt | 4.20% | 4.90% |
| After-tax WACC | 6.8% | 8.9% |
| Selected WACC | 7.9% | |