There are a bunch of strategies here, but one people oft repeat is the "buy, borrow, die" approach. Where, they are kicking the can down the road, but the magic happens at the die step. When the borrower dies:
Your heirs inherit your stocks, with their cost basis reset to the current price. This means that they have zero appreciation of your purchase of $RIVN at $67, despite it being at $420. They can then sell the shares, to pay the loans, and not owe capital gains, because there are no gains. Additionally, at this step cash can be extracted for no gains as well if desired.
So you avoid taxes while alive by taking loans (not income), avoiding capital gains (never selling), and then gains evaporate through a stepped up basis. There are some exceptions here - estate taxes, etc with ways around them like trusts, but this is the general mechanism.
Its worth noting though, that its not ironclad. In a significant downturn you can be forced to liquidate and it will hurt (see the news on Musk right after X purchase). Additionally, while people talk about this as being super popular, realize that in practice people who take advantage of these strategies also still have millions in cash flow, so its not a true borrow only $0 tax lifestyle, they will use already taxed money to manage them as well.
Minor nitpick. The step up in basis actually happens when you die (not when your heirs receive the assets), and your estate has to pay off creditors before distributing assets. So the debt is paid off first, then your heirs get whatever is left over. Net result is the same though.
I'm familiar with this strategy but there's one thing about it that I don't understand: After death, the loans are an estate liability, right? Doesn't the estate need to be settled before heirs get their inheritance? If i had an outstanding $1MM loan, wouldn't the estate need to liquidate some of that $RIVN at the $67 basis in order to pay the loan? and then whatever $RIVN was left over would go to the heirs at a stepped-up basis?
The step up in basis happens when you die, so the estate has no capital gain. Then the debts are paid, then the heirs get whatever they're supposed to get.
I conflated the two, since it all happens pretty quickly, but the estate is actually the recipient of the updated basis. So the estate sells @ current price, pays the negligible difference on gains from appreciation while the estate settles, if any happened, and then passes out the rest.
There's a LOT of nuance in any answer to this but the short of it is: we've already been downgraded by all the major agencies over the last 15 years, despite this - the market doesn't really seem to care. Partly because while our actual debt # is high - we're also giga rich, leaving us around #10 for debt-to-GDP right next to Italy, Canada, and France. Furthermore, the gap between places to ~#8-#20 is pretty small so its even less severe in practice. These numbers will shift a little bit based on which estimates you look at, but the spirit shouldn't change. So, its not a major issue today but it could become one if spending continues to accelerate.
Your heirs inherit your stocks, with their cost basis reset to the current price. This means that they have zero appreciation of your purchase of $RIVN at $67, despite it being at $420. They can then sell the shares, to pay the loans, and not owe capital gains, because there are no gains. Additionally, at this step cash can be extracted for no gains as well if desired.
So you avoid taxes while alive by taking loans (not income), avoiding capital gains (never selling), and then gains evaporate through a stepped up basis. There are some exceptions here - estate taxes, etc with ways around them like trusts, but this is the general mechanism.
Its worth noting though, that its not ironclad. In a significant downturn you can be forced to liquidate and it will hurt (see the news on Musk right after X purchase). Additionally, while people talk about this as being super popular, realize that in practice people who take advantage of these strategies also still have millions in cash flow, so its not a true borrow only $0 tax lifestyle, they will use already taxed money to manage them as well.