[zaroth]

At the Federal level there is a progressive estate tax up to 40%.

I don’t believe the rates have changed much, but the base amount which is excluded has increase to ~$5.5million per person, $11m per married couple.

Why do you say “used to”? This is not nearly so much of an exclusion amount as to approach an effect where “a very small fraction of the population will control the vast majority of all economic resources.”