You don't have to pay $100 bn under my wealth tax: Senator to Gates

US Senator Elizabeth Warren said she'd "love to explain" to Bill Gates how much he'd pay under her wealth tax after Gates said he might have to pay $100 billion, though he said he was "just kidding". "I promise it's not $100 billion," Warren, a Democratic Presidential candidate, told him. Gates added he had paid over $10 billion in taxes.