As long those transactions would be passing up on a third party or platform then you are really that subjected to tax specially on fiat conversion on which it would really be just that a normal approach and the most nearest thing that i do have in mind in is on how to avoid taxes is to make out that p2p transactions face to face but this is somewhat that risky i would say and not all would really be that willing or confident on doing so considering that meeting up with some stranger which you do hold bitcoin or cash would really be putting you in danger.This is why only a few would really be having consideration on taking up such transaction and would really be just that prefer on touching up those platforms and services which do make out some direct conversion. Literally, if those USDT would really be siting somewhere else or not really that touching up or making out some conversion to be directly be deposited into your bank account then you cant really be taxed but on the time that it would really be traced up on your bank account then this is where questions been raised. You are really that subjected on paying up tax specially if your government is really that too keen and that too mindful about their citizens taxes no matter on what methods or ways or sources it do came from, they would really be always finding the
way that they would be getting out their share.