Why would you even need a de minimis exemption on a stablecoin? That's like a de minimis exemption for exchanging a dollar for four quarters...
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I would assume if you're wanting to earn yield? I don't know, I don't mess with these things.
De minimis exemption is for asset appreciation; capital gains if held long term, regular income if held short term. Yield is taxed as regular income unless it's a "qualified" distribution. Doesn't make any sense for stablecoins. I'm not saying he's lying, but it's bullshit either way.