IMHO'This article, by Andrew Barry, is almost like 'clickbait.' I say almost because, while it's actually a Congressional proposal it has very little chance of passing.

I think you will find upon further investigation that the "Inflation Reduction Act" has advanced past the congressional proposal stage and has in fact been passed as law by congress. The specific carve-outs and guidance of its implementation are not yet clarified.

There are many reasons Berkshire might report a year with a sub-15% rate of cash taxes on "book" profits. A lot of them, like Berkshire Hathaway Energy's green energy tax credits, are likely to be specifically carved out since the very same legislation addresses and extends these tax credits specifically.

There are also likely to be carve-outs for securities held inside insurance companies, just as securities held inside insurance companies do not receive the same tax treatment before the act was passed.

Trust that the industry lobbyists are hard at work seeking to participate in all the little detail clarifications yet to be published.