Growth Metrics

Biogen (BIIB) Tax Rate (2016 - 2026)

Biogen has reported Tax Rate over the past 18 years, most recently at 15.41% for Q1 2026.

  • For Q1 2026, Tax Rate fell 731.0% year-over-year to 15.41%; the TTM value through Mar 2026 reached 15.47%, down 11.0%, while the annual FY2025 figure was 16.94%, 257.0% up from the prior year.
  • Tax Rate for Q1 2026 was 15.41% at Biogen, up from 12.68% in the prior quarter.
  • Over five years, Tax Rate peaked at 51.63% in Q3 2023 and troughed at 8.51% in Q4 2024.
  • A 5-year average of 18.2% and a median of 15.41% in 2026 define the central range for Tax Rate.
  • On a YoY basis, Tax Rate climbed as much as 8735bps in 2022 and fell as far as -10044bps in 2022.
  • Year by year, Tax Rate stood at 8.99% in 2022, then soared by 63bps to 14.64% in 2023, then plummeted by -42bps to 8.51% in 2024, then skyrocketed by 49bps to 12.68% in 2025, then increased by 22bps to 15.41% in 2026.
  • Business Quant data shows Tax Rate for BIIB at 15.41% in Q1 2026, 12.68% in Q4 2025, and 16.29% in Q3 2025.