AbbVie Pressed by Senator on How U.S. Humira Sales Limit Taxes

AbbVie Inc., maker of the blockbuster rheumatoid arthritis medication Humira, is using units in Bermuda and Puerto Rico to shrink its tax bill even though the company generates most of its sales in the U.S., Senate Finance Committee Chairman Ron Wyden said.

Wyden demanded Friday that the Illinois-based drugmaker explain the tax implications of having the Bermuda unit hold its intellectual property for Humira, the world’s best-selling drug. While components are made through a Puerto Rico branch, no manufacturing, packaging or distribution of Humira takes place in Bermuda, Wyden said in a letter to AbbVie.

“The lack of ...