When you have that amount of insane net worth in equity you effectively never need to sell, and you get taxed on the tiny yield of dividends, which is an tinier percentage of your wealth.
That tiny amount of capital gains can probably be written off with business losses, but I don't know much about that - I imagine there are many loopholes to make your effective tax rate 0%.
Buffett paying the least makes sense in this light - from what I understand of his philosophy he likely is a less active trader than other billionaires, so even less capital gains from sales are taxable.
― Nhex, Wednesday, 9 June 2021 02:07 (two years ago) link