Biogen (BIIB) Tax Rate (2009 - 2026)

Biogen has reported Tax Rate for 18 years, with the latest figure at 26.36% in Q2 2026.

• On a quarterly basis, Tax Rate rose 1168.0% year-over-year to 26.36% in Q2 2026; TTM through Jun 2026 was 17.48%, a 262.0% increase from a year earlier, with the FY2025 full-year figure at 16.94%, up 257.0% from the prior year.
• Tax Rate was 26.36% for Q2 2026 at Biogen, up from 15.41% in the prior quarter.
• The five-year high for Tax Rate was 51.63% in Q3 2023, with the low at 8.51% in Q4 2024.
• Average Tax Rate over 5 years is 18.66%, with a median of 15.81% recorded in 2023.
• The largest YoY upside for Tax Rate was 8735 bps in 2022 against a maximum downside of 10044 bps in 2022.
• Over 5 years, Tax Rate stood at 8.99% in 2022, then surged by 63 bps to 14.64% in 2023, then sank by 42 bps to 8.51% in 2024, then surged by 49 bps to 12.68% in 2025, then jumped by 108 bps to 26.36% in 2026.
• The last three Tax Rate figures came in at 26.36% (Q2 2026), 15.41% (Q1 2026), and 12.68% (Q4 2025), per Business Quant data.