Rather than the system we have now, I would rather have a national sales tax of 5%, which excludes food (meaning potatoes, meat, eggs, milk, etc. and not packaged poison like chips, dip, ice cream, etc.), medicine/medical care/medical supplies, clothes (up to $200 per item/pair/set), housing (rent/mortgage), and finally all firearms, ammo, and accessories.
Everything else: 10%.
Every 5 years, the tax rate would be reviewed and can only be adjusted down if the national debt increases, as a small, direct protection against inflation and may never be increased, as if any other national tax is levied, the system has a self-destruct clause which will nuke the whole thing.
This system is easy, more fair and equitable since everyone will contribute, even illegals or tourists, it spares "the poor" from paying taxes on actual necessities, and encourages citizens to become more self sufficient.