The WACC of Aon PLC (AON) is 7.4%.
| Range | Selected | |
| Cost of equity | 6.80% - 9.30% | 8.05% |
| Tax rate | 16.70% - 17.50% | 17.10% |
| Cost of debt | 4.10% - 5.10% | 4.60% |
| WACC | 6.3% - 8.5% | 7.4% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.63 | 0.78 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 6.80% | 9.30% |
| Tax rate | 16.70% | 17.50% |
| Debt/Equity ratio | 0.17 | 0.17 |
| Cost of debt | 4.10% | 5.10% |
| After-tax WACC | 6.3% | 8.5% |
| Selected WACC | 7.4% | |