How will they force collections?
Theres also the idea in the UN to take over the internet and all monies would be paid to the UN. Look at the forum in Switzerland now. THAT'S THE AGENDA.
That's easy. It will be just like it is now, but afterwards the Feds will pass money onto the UN. You wouldn't have a separate international tax return; all of the domestic machinery would still be in places.
After all, how different would that be from the situation now where your taxes are wasted on a lot of useless pork we don't approve of? (Aside from the fact I would REALLY, REALLY disapprove of an international tax).