You are confusing earnings and revenues. Amazon had revenues for its retail business of $60bn. But, in order to get that revenue, they spent a lot of money, maybe even more than that. The IRS doesn’t tax revenue, only profits - and Amazon’s profit last year was $5.6bn. And it seems like they may have paid $0 to the IRS in taxes, although they paid quite a bit to foreign governments, which is deductible.