What % of tax revenues should the rich (top 5%) pay?

[Soleron]

SamuelRSmith said:

Assuming that I had my way on all of the above, and the Governmental debt was 0 or close (like, under 10% of GDP), then I would see no valid reason for an income tax at all. At any level. Also, low capital gains, inheritance and corporation taxes.

What about picking one kind of tax and only doing that? Why do we need so many kinds of taxes?

Then you could lay off 90% of the IRS/Inland Revenue/etc.

Considering all the small ways we are currently taxed, a 50% average income tax would probably be less than the UK pays now [given national insurance, VAT, petrol duty, import duties, capital gains, ..... ]