Aon (AON) Tax Rate (2009 - 2026)

Aon's Tax Rate history runs 18 years deep, the most recent figure standing at 20.22% for Q1 2026.

• On a quarterly basis, Tax Rate fell 122.0% year-over-year to 20.22% in Q1 2026; TTM through Mar 2026 was 20.84%, a 19.0% increase from a year earlier, with the FY2025 full-year figure at 21.2%, down 23.0% from the prior year.
• Tax Rate eased to 20.22% in Q1 2026 per AON's latest filing, from 22.86% in the prior quarter.
• Across five years, Tax Rate topped out at 23.24% in Q1 2024 and bottomed at 6.06% in Q4 2022.
• The 5-year median for Tax Rate is 19.6% (2023), against an average of 18.48%.
• Biggest YoY gain for Tax Rate was 2069 bps in 2022; the steepest drop was 1526 bps in 2022.
• Year by year, Tax Rate stood at 6.06% in 2022, then soared by 176 bps to 16.75% in 2023, then gained by 5 bps to 17.62% in 2024, then advanced by 30 bps to 22.86% in 2025, then dropped by 12 bps to 20.22% in 2026.
• Per Business Quant, the three latest AON Tax Rate figures stand at 20.22% (Q1 2026), 22.86% (Q4 2025), and 21.27% (Q3 2025).