Pay Our Troops Act of 2018 This bill provides FY2018 appropriations for military pay and allowances during any period in which interim or full-year appropriations for FY2018 are not in effect. In the event of a government shutdown, the bill provides continuing appropriations for pay and allowances of: members of the Armed Forces, including reserve components, who perform active service during the period; members of the reserve components of the Armed Forces who perform inactive-duty training during the period; and civilian personnel or contractors of the Department of Defense (and the Department of Homeland Security in the case of the Coast Guard) that are providing support to members of the Armed Forces. The appropriations provided by this bill are available until the earlier of: (1) the enactment into law of specified appropriations legislation, or (2) January 1, 2019.