$19,845,830,862,591.25 is the National Debt as I write this (thanks Debt Click Lite). And the bill says UP TO 10%. I figure most will choose zero, few 10% more below 5% than above it. It probably won't total 1% of tax revenues. So why not let people who are passionate on this subject be a little happier about where their tax dollars go? Hell YES, let them choose. It sounds like the kind of thing you are SUPPOSED to do in a Democracy.