Any capital gains till that moment are not taxed. Gains from selling assets are taxed. Normally when someone sells an asset, even a minute before they die, they owe 20% capital gains tax. The annual income of the moguls of the day  $1.3 million for William Astor; $576,000 for Cornelius Vanderbilt  was listed in the pages of The New York Times in 1865.) That may seem like a lot, but Buffett ranks as roughly the world's sixth-richest person  he's worth $110 billion as of Forbes' estimate in May 2021.
Much less than 1.3 million is less than $110 billion in May 207.
( z0 have-mod :ARG1 ( z1 less-than :op ( z2 monetary-quantity :quant ( z3 much ) :quant 1000000 ) :op ( z4 monetary-quantity :quant 10000000000 :unit ( z5 dollar ) ) ) :time ( z6 date-entity :month 5 :year 207 ) )
(z0 / have-mod-91
    :ARG1 (z1 / less-than
              :op1 (z2 / monetary-quantity
                       :quant (z3 / much)
                       :quant 1000000)
              :op1 (z4 / monetary-quantity
                       :quant 10000000000
                       :unit (z5 / dollar)))
    :time (z6 / date-entity
              :month 5
              :year 207))
Much less than 1.3 million is less than $ 110 billion in May 207 .
z2 :quant z3
z2 :quant 0
z1 :op1 z2
z4 :unit z5
z1 :op1 z4
z4 :quant 1
z0 :ARG1 z1
z0 :time z6
z6 :month 3
z6 :year 2