Earlier quoted context omitted.
You think that Bezos and Musk have billions in their own personal bank account? So what do you mean be "extreme wealth"? Companies? Dividend payouts? House? Yachts? I agree that luxury items that are out of reach of the middle class (eg sport cars etc...) should be taxed highly, but a toy that a rich person can buy vs a rich person investing money into his own or other companies is a problem if you want to tax that s…
Paper wealth used as collateral for loans should be taxed as income (or capital gains).
Significant loans on collateral are liquidity events.
In general, any loan that was taxed up front as income, could be paired with counting loan payments on the principle as an expense against income. (And if the loan was for business, not personal, interest would also be an expense.)
This would make loans tax neutral vs. other ways of getting money out of assets.
It would eliminate the practice of cycles of leverage that lets the rich grow their wealth, use that to grow more wealth, over and over, while pushing taxation into the future indefinitely.
And it would make loans less attractive to take out (the upfront tax), and yet much easier to pay off (symmetric tax break for paying down debt). Which would result in a much less leveraged, more resilient, economy.