It rankled with me when I was 15-17 that I had to pay income tax as a kid making ~$70-$90 per day. My paltry income would be doing nothing for Mr tax man, but that money would be much better given to me on payday. I think I would have signed up to vote and get a say in how it was spent. But there are also a lot of 16 year old morons who would act in predictable ways if forced to vote.

Maybe introduce it as optional until you are 18? And then it goes compulsory.