In 2017 Amazon recorded a $137 million refund for US federal income taxes. However, nationwide it paid $211 million in state corporate income taxes. It also pays property tax and sales tax (on things Amazon itself buys). Reportedly Amazon paid ~$250 million total in taxes to Washington state in 2017. [1]

Maryland's "Promoting ext-Raordinary Innovation in Maryland's Economy (PRIME Act)", signed 4/25/2018, provides credits against all these kinds of taxes [2].

[1] https://www.seattletimes.com/business/amazon/amazon-paid-250...

[2] http://mgaleg.maryland.gov/webmga/frmMain.aspx?pid=billpage&...