• Biogen average pre-tax profit margin for 2023 was 24.26%, a 7.44% decline from 2022.
• Biogen average pre-tax profit margin for 2022 was 26.21%, a 28.48% decline from 2021.
• Biogen average pre-tax profit margin for 2021 was 20.4%, a 54.89% increase from 2020.

Pre-tax profit margin can be defined as earnings before taxes as a portion of total revenue.