The best possible tax scheme for poor people would be a wealth tax. Make it a flat wealth tax, and I'm with you: 10% (or whatever) of what you possess, into the community coffers every year. Don't muck around with income, it's too easy to game.
I don't see how a wealth tax is a good idea at all. If you could recommend a good article that argues why it's good and how it would work I'd love to read it.
You want your tax system to reward long term thinking, not punish it.