Yeah I'm aware of that much but toast0 said both transactions (which I took to mean for example BTC -> Tether and Tether -> BTC) would both be taxed which doesn't make sense where Tether is working as intended and holds value at $1. Of course the sale of BTC for Tether would be taxed because the market for that is moving but Tether in theory should not have an additional tax exposure just like selling BTC for USD then buying ETH doesn't require you to pay taxes on your ETH purchase with USD.
Essentially, you're being taxed on the income you got from holding that security, not for trading, it's just assessed when you trade.