The WACC of Marathon Petroleum Corp (MPC) is 7.6%.
| Range | Selected | |
| Cost of equity | 8.50% - 11.40% | 9.95% |
| Tax rate | 19.20% - 20.90% | 20.05% |
| Cost of debt | 4.20% - 4.90% | 4.55% |
| WACC | 6.6% - 8.7% | 7.6% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 1.01 | 1.17 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 8.50% | 11.40% |
| Tax rate | 19.20% | 20.90% |
| Debt/Equity ratio | 0.58 | 0.58 |
| Cost of debt | 4.20% | 4.90% |
| After-tax WACC | 6.6% | 8.7% |
| Selected WACC | 7.6% | |