In an op-ed column in Monday's New York Times, Buffett says high-income individuals need to pay more taxes.
He's pushing for a 30% tax rate for those making between one and ten million dollars, and 35% for those making more than that.
President Obama's "millionaire tax" would keep the tax rate at 30% for anyone making more than a million dollars.
Buffett says he doubts that more taxes on the rich would do anything to slow growth or job creation.
Many wealthy taxpayers pay less taxes from their income, because much of it comes from capital gains or interest, which carry a lower tax rate.