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Ionis Pharmaceuticals (IONS) Tax Rate (2016 - 2025)

Ionis Pharmaceuticals has reported Tax Rate over the past 16 years, most recently at 0.96% for Q4 2025.

  • Quarterly results put Tax Rate at 0.96% for Q4 2025, down 152.0% from a year ago — trailing twelve months through Dec 2025 was 113.1% (up 11177.0% YoY), and the annual figure for FY2025 was 113.11%, up 11177.0%.
  • Tax Rate for Q4 2025 was 0.96% at Ionis Pharmaceuticals, up from 0.17% in the prior quarter.
  • Over the last five years, Tax Rate for IONS hit a ceiling of 2.51% in Q3 2024 and a floor of 234.77% in Q4 2023.
  • Median Tax Rate over the past 5 years was 0.14% (2021), compared with a mean of 13.78%.
  • Biggest five-year swings in Tax Rate: plummeted -21649bps in 2023 and later surged 23725bps in 2024.
  • Ionis Pharmaceuticals' Tax Rate stood at 0.13% in 2021, then plummeted by -13663bps to 18.27% in 2022, then plummeted by -1185bps to 234.77% in 2023, then soared by 101bps to 2.48% in 2024, then plummeted by -61bps to 0.96% in 2025.
  • The last three reported values for Tax Rate were 0.96% (Q4 2025), 0.17% (Q3 2025), and 0.02% (Q2 2025) per Business Quant data.