Ionis Pharmaceuticals (IONS) Tax Rate (2009 - 2026)

Ionis Pharmaceuticals' Tax Rate history runs 17 years deep, the most recent figure standing at 0.24% for Q1 2026.

• In Q1 2026, Tax Rate fell 16.0% year-over-year to 0.24%; the TTM figure through Mar 2026 stood at 0.58% (down 189.0% YoY), while the FY2025 annual figure was 0.47%, down 181.0% from the prior year.
• Tax Rate was 0.24% for Q1 2026 at Ionis Pharmaceuticals, up from 0.64% in the prior quarter.
• In the past five years, Tax Rate ranged from a high of 2.5% in Q3 2024 to a low of 234.77% in Q4 2023.
• Historically, Tax Rate has averaged 16.39% across 5 years, with a median of 0.64% in 2022.
• The sharpest annual moves came in 2023 and 2024: Tax Rate sank 21662 bps in 2023, then soared 23725 bps in 2024.
• A 5-year view of Tax Rate shows it stood at 18.15% in 2022, then plunged by 1194 bps to 234.77% in 2023, then surged by 101 bps to 2.48% in 2024, then plunged by 126 bps to 0.64% in 2025, then soared by 63 bps to 0.24% in 2026.
• The last three Tax Rate figures came in at 0.24% (Q1 2026), 0.64% (Q4 2025), and 0.17% (Q3 2025), per Business Quant data.