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by hundt 1834 days ago
> to actually do anything with that paper wealth, he needs to sell the stock or engage in a similar realization event, in which case that gain will be taxed

The ProPublica analysis that the BBC refers to [1] explains it: you borrow with the capital as collateral and then when you die the debt is repaid by selling some of the capital. But because of the stepped-up basis on death there is never a "realization" of positive gains.

[1] https://www.propublica.org/article/the-secret-irs-files-trov...