I don't know, but I would assume so. I think most people try to pay the minimum tax they are required to, and I guess that includes Mr Buffet.
However, that's not the point. He's not saying "I want to personally pay more tax", he's saying "Why are people like me not being required to pay the same percentage tax as middle-income earners"?
OK, what about the many "breaks and loopholes." for the other tax brackets? I'm in the 25% bracket (Married filing jointly, $68,001 - $137,300) and I paid under 6% effective rate for each of the last few years.
Buffet is not talking about income tax. He's talking about capital gains taxes, since most wealthy people are making money from investments, not paychecks.
However, that's not the point. He's not saying "I want to personally pay more tax", he's saying "Why are people like me not being required to pay the same percentage tax as middle-income earners"?