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Biogen (BIIB) Tax Rate (2016 - 2025)

Biogen has reported Tax Rate over the past 17 years, most recently at 12.68% for Q4 2025.

  • Quarterly results put Tax Rate at 12.68% for Q4 2025, up 417.0% from a year ago — trailing twelve months through Dec 2025 was 16.94% (up 257.0% YoY), and the annual figure for FY2025 was 16.94%, up 257.0%.
  • Tax Rate for Q4 2025 was 12.68% at Biogen, down from 16.29% in the prior quarter.
  • Over the last five years, Tax Rate for BIIB hit a ceiling of 109.43% in Q4 2021 and a floor of 70.28% in Q2 2021.
  • Median Tax Rate over the past 5 years was 15.02% (2024), compared with a mean of 16.69%.
  • Biggest five-year swings in Tax Rate: surged 10566bps in 2021 and later crashed -10044bps in 2022.
  • Biogen's Tax Rate stood at 109.43% in 2021, then tumbled by -92bps to 8.99% in 2022, then surged by 63bps to 14.64% in 2023, then crashed by -42bps to 8.51% in 2024, then surged by 49bps to 12.68% in 2025.
  • The last three reported values for Tax Rate were 12.68% (Q4 2025), 16.29% (Q3 2025), and 14.68% (Q2 2025) per Business Quant data.