The “buy, borrow, die” trick is hiding a credit bomb in DeFi lending pools

Here's a quiet problem for anyone supplying liquidity to DeFi lending pools: you might be the unwilling creditor in someone's estate plan.

It goes like this. Say someone bought ETH at $1,000 and watched it climb to $4,000. They want $1,000 in cash. Selling a quarter of the ETH gets them there, but it also triggers a $750 taxable gain. Instead, they deposit the full ETH into a lending protocol, borrow $1,000 in a stablecoin, and pocket the proceeds. The loan isn't taxable income. That's the “buy, borrow, die” playbook, and it's been a staple for the ultra-rich in real estate and stocks for years.

DeFi has now made it painfully easy. No credit check, no lender discretion, just collateral and a smart contract.

But here's the thing that should worry you: these borrowers don't intend to repay. The strategy only works if they die while the loan is outstanding, at which point their heirs inherit the ETH and, under current law, get a step-up in basis to its fair market value. The loan gets repaid from the estate, no capital gains tax ever paid. That's the theory.

The hidden cost is landing on DeFi lenders. You're not lending to someone with cash flow. you're lending against a volatile asset that the borrower has every incentive to never buy back. If ETH drops to $1,500, the collateral ratio gets thin. The borrower can add more ETH or face liquidation. But if they're doing this for tax reasons, they're likely holding across a drawdown, which means lenders absorb more volatility than they signed up for.

From a compliance standpoint, there's nothing illegal about borrowing against your crypto. The IRS taxes realized gains, and a loan isn't a realization event. But the legal tax avoidance machine is now intertwined with DeFi credit risk in a way few liquidity providers seem to understand. The protocols don't ask about your estate plan. They can't. So the risk modeling that keeps lending pools safe assumes borrowers eventually repay. “Buy, borrow, die” breaks that assumption.

This is a massive, understated shift in who bears the burden. Retail liquidity providers are becoming the unintended counterparties to sophisticated tax deferral strategies. How comfortable are you being the unwitting creditor to someone's plan to never sell?

Watch for lending protocols to quietly tighten loan-to-value ratios or raise interest rates on ETH as collateral if these outstanding loans start sitting for years. The next bear market will reveal exactly who was borrowing and what they intended to do about it.