Once you die the estate settles the loans via the creditors just grabbing the collateral. I think it would never get taxed then no?
I suppose one thing nobody has mentioned is that deferral can also help you wait for a year when the rate of the top tax bracket is lowered? Maybe that's a significant component too?
For folks this wealthy, I doubt the difference in tax brackets make much of a difference. What's classified as income is probably such a small portion of what they get taxed on that it just doesn't matter.
And obviously the logic would be the same for if/when they change the long-term capital gains tax rates.
What are property taxes? Effectively this but for a specific asset.
Granted they are not based in the rise in value. But the idea of paying tax for holding something is not new.
Taxing stock ownership is a tax on investing.