Ameren (AEE) Tax Rate (2009 - 2026)

Ameren's Tax Rate history runs 18 years deep, the most recent figure standing at 14.35% for Q1 2026.

• On a quarterly basis, Tax Rate fell 35.0% year-over-year to 14.35% in Q1 2026; TTM through Mar 2026 was 8.72%, a 189.0% increase from a year earlier, with the FY2025 full-year figure at 8.52%, up 198.0% from the prior year.
• Tax Rate advanced to 14.35% in Q1 2026 per AEE's latest filing, from 3.69% in the prior quarter.
• Across five years, Tax Rate topped out at 19.7% in Q4 2023 and bottomed at 37.75% in Q4 2024.
• The 5-year median for Tax Rate is 13.44% (2025), against an average of 9.46%.
• Across the five-year window, Tax Rate plunged 5745 bps in 2024 and surged 3406 bps in 2025, its largest moves.
• Year by year, Tax Rate stood at 14.58% in 2022, then jumped by 35 bps to 19.7% in 2023, then sank by 292 bps to 37.75% in 2024, then jumped by 90 bps to 3.69% in 2025, then surged by 489 bps to 14.35% in 2026.
• Per Business Quant, the three latest AEE Tax Rate figures stand at 14.35% (Q1 2026), 3.69% (Q4 2025), and 7.5% (Q3 2025).