I think as long as you don't convert it to fiat, and switch it between crypto's, there is no taxes in the meantime to do. Like, the USDT on exchanges isn't actually dollars... it's a crypto that's worth 1 dollar. So if you sold Bitcoin for USDT you did not actually sell for fiat and thus did not make capital gains? I dunno.. I am not an expert and I am not sure there's even clear rules on this yet