From their 2018 10-K: "We have tax benefits relating to excess stock-based compensation deductions and accelerated depreciation deductions that are being utili

From their 2018 10-K: "We have tax benefits relating to excess stock-based compensation deductions and accelerated depreciation deductions that are being utilized to reduce our U.S. taxable income. The U.S. Tax Act enhanced and extended the option to claim accelerated depreciation deductions by allowing full expensing of qualified property, primarily equipment, through 2022. Cash taxes paid (net of refunds) were $412 million, $957 million, and $1.2 billion for 2016, 2017, and 2018. As of December 31, 2018, our federal net operating loss carryforward was approximately $627 million and we had approximately $1.4 billion of federal tax credits potentially available to offset future tax liabilities. Our federal tax credits are primarily related to the U.S. federal research and development credit. As we utilize our federal net operating losses and tax credits we expect cash paid for taxes to increase. We endeavor to manage our global taxes on a cash basis, rather than on a financial reporting basis. In connection with the European Commission’s October 2017 decision against us on state aid, Luxembourg tax authorities computed an initial recovery amount, consistent with the European Commission’s decision, of approximately €250 million, that we deposited into escrow in March 2018, subject to adjustment pending conclusion of all appeals." Source: https://www.sec.gov/Archives/edgar/data/1018724/000101872419000004/amzn-20181231x10k.htm https://www.sec.gov/Archives/edgar/data/1018724/000101872419...