@Andy ***********
The latest status (October 2024) is that you must apply for a TIN number and complete a tax return on your 2024 income, which must be submitted by the end of March 2025.
You are free to ignore this. But don't cry when you feel the consequences. As I mentioned earlier, the immigration and tax authorities work hand in hand, and if you don't have a TIN number and haven't filed a tax return, you won't get any further extensions of your visa.
Do what you think is right, I don't care!