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Amphastar Pharmaceuticals (AMPH) Tax Rate: 2013-2025

Historic Tax Rate for Amphastar Pharmaceuticals (AMPH) over the last 11 years, with Sep 2025 value amounting to 19.35%.

  • Amphastar Pharmaceuticals' Tax Rate rose 414.00% to 19.35% in Q3 2025 from the same period last year, while for Sep 2025 it was 29.19%, marking a year-over-year increase of 784.00%. This contributed to the annual value of 23.99% for FY2024, which is 113.00% down from last year.
  • Amphastar Pharmaceuticals' Tax Rate amounted to 19.35% in Q3 2025, which was down 8.35% from 21.11% recorded in Q2 2025.
  • Over the past 5 years, Amphastar Pharmaceuticals' Tax Rate peaked at 46.86% during Q4 2024, and registered a low of 8.62% during Q1 2024.
  • Its 3-year average for Tax Rate is 22.82%, with a median of 20.11% in 2023.
  • Examining YoY changes over the last 5 years, Amphastar Pharmaceuticals' Tax Rate showed a top increase of 3,437bps in 2021 and a maximum decrease of 1,669bps in 2021.
  • Quarterly analysis of 5 years shows Amphastar Pharmaceuticals' Tax Rate stood at 26.49% in 2021, then surged by 1,771bps to 44.20% in 2022, then tumbled by 850bps to 35.70% in 2023, then soared by 1,117bps to 46.86% in 2024, then spiked by 414bps to 19.35% in 2025.
  • Its last three reported values are 19.35% in Q3 2025, 21.11% for Q2 2025, and 18.07% during Q1 2025.