By borrowing against their holdings. The framing is deceptive. You can do this too: there is no requirement to have billions in collateral. If you own stocks, your brokerage will lend you money at a very low rate, secured by the equity - typically up to about half of your stocks' worth. The gotcha is market risk. If there's another crash akin to the housing crisis - and there will be - the bank will liquidate your ho…
This explanation never made sense to me. Say someone gives you a $1M loan. Holy cow, it's not taxed, what a loophole! But wait, this was a loan, not a gift. So don't you eventually have to pay back the >$1M later from taxed income? So you still end up paying taxes on $1M either way? How in the world does this bypass taxes? Edit: To people bringing back the "buy, borrow, die" story: (a) Yes, I saw that a couple months…
At that point your stocks (and other assets like houses) have their cost-basis adjusted to the current price. So the capital gains tax on your assets are $0 as their cost basis is the same as the price so the appreciate is $0. If _you_ sold the stocks before your death then likely there would be a large gap between the cost-basis (price you bought the stock) and the current price resulting in a large capital gains tax.
So, when your estate sells the stocks to pay back the loan they pay the applicable taxes on the $0 and then uses the remaining proceeds to pay back the loan.