They have discussed implementing/enforcing taxation on tax residents of 180 days plus.
However no official procedure is implemented yet.
Anyone registering is doing so voluntarily and they do not have the system in place yet to process.
It is a wait and see at this point what , if anything , comes of it.
They are after those hiding global income, many rich Thais and foreigners with overseas money taking advantage of a loophole that is supposedly closed now.
Money being brought in , may be subject to tax regardless of whether it is not in the same fiscal year.