In countries without sovereign currencies it's more complicated, but in the US money wouldn't even need to be collected (technically it would need to be collected/added as debt, but that's entirely due to the Constitution and not some kind of natural law). The only real considerations needed to spend are whether or not adding more debt is politically viable and whether or not percepetions of and expectations for inflation are manageable. A UBI would be way too big to be able to avoid triggering inflation expectations and opportunism. Ending hunger would be much more manageable as the costs are very low relative to the impact and so it could be more easily hidden from financial doom-speakers.