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https://twitter.com/WatcherGuru/status/18748707686283594401. THE GENERAL RULE. The rule for basis tracking for fungible assets like crypto has always been that, when you sell, you need to either "specifically identify" which lot you're selling, or otherwise default to being treated as selling in the order you acquired the assets. So if, e.g., you hold both high-basis and low-basis IBM stock with JPM, and decide to sell some (but not all) of your IBM stock, either (a) you need to specifically identify to JPM which lot you're selling (usually the high-basis lot) or (b) otherwise JPM will send you a 1099 reporting under a "first in, first out" (FIFO) method.
https://twitter.com/BernieSanders/status/16379530699787304992/ APPEAL. There's some appeal to MTM taxes. Wealth appreciation is "income" per Haig-Simons. The rich can borrow against their wealth without triggering tax. And when they die, their assets generally get a free basis step-up, so no one pays tax on asset appreciation.
https://twitter.com/SBF_FTX/status/1582835426116575235