Suppose I defer $1 million in taxes until after I'm dead, and my estate conveniently does not have $1 million in assets left. What happens?
In the meantime, I gave all the assets to my children while I was alive
The answer is nothing. The government eats the loss.
What loss? It was never the state's money to begin with.
The government looks at your transactions as designed to produce that outcome and claws back the money from your children.