Do any countries have a low, progressive, dual, flat tax system ?
Here's my idea/suggestion :
1) Start taxing people once they are above the poverty line (approx. $20,000 US).
2) For those whose personal income is between $20,000 and $99,999 /yr., tax them at 15%.
3) For those $100,000 and up, tax them at 20%
4) The corporate tax rate could be set at 20%, with a complete exemption for small businesses.
This would simplify the tax code, and eliminate distortion.
It would also create a marginal tax of over 100% at the $100,000 line. If you made $99,999, you'd pay $14,999 and end up with $85,000; if you made $100,000, you'd pay $20,000 and end up with $80,000. In other words, that extra $1 you made would cost you $5,000.
That's why tax codes are progressive -- the idea is to avoid pushing the marginal tax -- the tax you pay for any *extra* dollar you earn -- past a certain point. In the 1960's in the US, the marginal tax was as high as 90%, which was a pretty obvious disincentive... or, rather, incentive to think of clever ways to evade it.
-Eliminate all loopholes, and enact legislation with very harsh penalties for ANY form of tax evasion / loopholing.
That's easier said than done.
-Make all gov't agencies very cheap and efficient - no earmarks, no lofty salaries for politicians, no corporate welfare (corporate welfare hit 90 Billion / yr. under Bush ), no extravagant budgets or bonuses for politicians, etc.
Eliminating earmarks and corporate welfare would certainly be a good idea, but lowering salaries for politicians might not be. If you lower them too much, you create an incentive for corruption. It would be a better idea to make sure the straight-out salaries paid to politicians are high enough to make the jobs attractive -- and then create an anti-corruption enforcement and penalty regime tough enough to provide a strong disincentive to corruption. Personally, I would suggest impalement on spikes in front of the Congress building.
-Place a 1% tax on all non essential adult entertainment goods and services(adult movies, magazines, novels, alcohol, coffee, tobacco, etc.) and use that revenue to supplement the purchases of crucial items (food, shelter & clothing) for those in poverty.
Something like that already exists in most countries, albeit at a higher level. For example, in my country we have three different VAT levels -- the lowest for food, medium for books, and highest for everything else. In addition, we tax alcohol and tobacco pretty heavily.
-Reduce military funding and drug war spending / prison building.
In the case of the US, the first would be easy (just stop pouring money down the black holes of pie-in-the-sky weapons programs), but the second would require a pretty thorough overhaul of the legal and penal system. You'd have to get the incarceration rate down a quite a lot.
My idea is a multi-spectrum approach, with fiscal conservatism, socialist and libertarian elements intertwined.
It's a bit rough around the edges, but it's actually a pretty mainstream outlook on things.