Progressive taxes attempt to reduce the tax of people with a lower ability-to-pay, as they shift them increasingly to those with a higher ability-to-pay.
Unfortunately our progressive tax system has produced a nation of deadbeats and thugs. If you want fair, go with a consumption tax, that everyone pays.
Regressive taxes impose a greater burden (relative to resources) on the poor than on the rich — there is an inverse relationship between the tax rate and the taxpayer's ability to pay as measured by assets, consumption, or income.
A National Sales Tax is a Regressive tax.. The poor get poorer and the rich get richer..
Here you go, this is a quote from your own wiki reference.
"A value added tax or other sales tax on food and other essentials such as clothing, transport, and residential rents can be regressive."
It would depend how a national sales tax was actually set up. If you don't tax items with low income elasticity of demand, which is how the currect state sales tax is kind of set up then it may not be regressive.
^ In other words no tax on food and clothes, I would be all for that but with the libs in government they'd most likely want to tax these too, just like our health care.