I'm not familiar with the US tax laws, but in Canada if you don't file a tax return and don't owe money, there are no consequences. If you owe money, and do not pay, eventually you will end up in jail. That's actually being forced, and makes this a terrible analogy.
If someone is fired from the military for not getting a non-covid vaccine, are they being forced to get the vaccine?
They are not being forced. Stop playing word games.