😱 Berkshire taxes

Excerpt:
“In an analysis published in Tax Notes International in November 2021, Martin Sullivan, a tax expert and chief economist at Tax Notes, estimated that Berkshire would have owed one of the largest amounts of taxes among megacap companies based on a 15% minimum corporate tax for period from 2018 through 2020. Its annual tax bill would have risen by an average of $3.2 billion over the period.”

Yes, I suppose the devil is in the details as always, but this could be painful. Has not our overall effective tax rate been 18-20% (since 2017)?