At the end of the day, you're obligation as a citizen of your country is to pay tax.
My obligation is to contribute to the society I live in, not to support the government I live under.
I'd go a lot further, or from a different perspective, I wouldn't go that far.
Do people have the right to be hermits? I'd say absolutely.
You have no obligation or duty to contribute to any society, and even not the one you live in.
So no, no one is under any obligation to pay tax to a government. A government may coerce you into paying but that still doesn't mean you're obligated. But all decent human beings do have a desire to contribute to the community of people in which they live.
I think that's a much better characterization - the desire to contribute. But I wouldn't go as far as to say they are obligated.
Going back to Immanuel Kant, the only good is a good will. If you remove freedom, there is no possibility to do anything moral. i.e. Where there is no freedom, there is no morality.
Kant was right. End of story.