How would Biden's "Billionaire Minimum Income Tax" work?

Contributing sentiments towards policy:

50% : If they sell the stock immediately, the heirs pay tax on any profit they earn above the $175 per share price, not the $1 price paid by woman who bought the stock years earlier.
45% : According to the Treasury Department, payments would be treated as a prepayment that would be credited against taxes paid at a later date on unrealized capital gains; in other words, those wealthy families wouldn't be taxed twice because the tax would act like an advance against future capital gains taxes triggered when they sell stock or other assets.
44% : Each year about 160 million families file taxes with the IRS, which means this tax would impact about 0.01% of all Americans.

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