Biogen (BIIB) Tax Rate (2009 - 2026)

Biogen (BIIB) has reported Tax Rate for 18 consecutive years, with 15.41% the latest figure, recorded in Q1 2026.

• In Q1 2026, Tax Rate fell 731.0% year-over-year to 15.41%; the TTM figure through Mar 2026 stood at 15.47% (down 11.0% YoY), while the FY2025 annual figure was 16.94%, up 257.0% from the prior year.
• Tax Rate came in at 15.41% for Q1 2026 at Biogen, up from 12.68% 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 18.2%, with a median of 15.41% recorded in 2026.
• The largest YoY upside for Tax Rate was 8735 bps in 2022 against a maximum downside of 10044 bps in 2022.
• Year by year, Tax Rate stood at 8.99% in 2022, then jumped by 63 bps to 14.64% in 2023, then tumbled by 42 bps to 8.51% in 2024, then surged by 49 bps to 12.68% in 2025, then climbed by 22 bps to 15.41% in 2026.
• According to Business Quant data, Tax Rate over the past three periods registered 15.41%, 12.68%, and 16.29% for Q1 2026, Q4 2025, and Q3 2025 respectively.