I am retired but do consulting for an international non-profit based in Belgium. I have no other clients. I invoice them quarterly for the work done, which also includes serving as editor of their quarterly magazine. I am paid via wire transfers to my US bank from a European bank. I occasionally travel overseas for various projects, including meetings in Europe and at headquarters, but most of my work is done from home. I receive no 1099 nor other forms since they are not a US organization. So: 1. Am I considered self-employed in the full sense (able to count expenses against income) or as an employee who uses Schedule C because it is the only option for reporting income in such circumstances? See the IRS page "How to Report Wage Income Paid by Foreign Governments or International Organizations"? 2: Do I pay Social Security/Medicare Taxes?
