# The biotechnology giant said Thursday that the IRS has proposed “significant adjustments’ to its tax bills from 2016 to 2018.

*business · news · 2026-05-01 · Bloomberg Tax News*

## Key points

- Amgen disclosed new IRS proposals for significant tax adjustments for 2016 to 2018.
- The IRS now seeks additional taxes from Amgen beyond the previously acknowledged $10.7 billion.
- The new IRS demands stem from alleged profit shifting to Puerto Rico for tax advantages.
- Amgen's latest dispute expands ongoing litigation covering tax years 2010 through at least 2018.

**Companies:** Amgen Inc.
**Countries:** United States, Puerto Rico

[Read the full story on Bloomberg Tax News](https://news.bloombergtax.com/daily-tax-report/irs-seeks-more-taxes-from-amgen-adding-to-10-7-billion-dispute)

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