The portability of social benefits is gaining importance given the increasing share of individuals working at least a part of their life outside their home country. Bilateral social security agreements (BSSAs) are considered a crucial approach to establishing portability, but the functionality and effectiveness of these agreements have not yet been investigated; thus important guidance for policymakers in migrant-sending and migrant-receiving countries is missing. To shed light on how BSSAs work in practice, this document is part of a series providing information and lessons from studies of portability in four diverse but comparable migration corridors: Austria-Turkey, Germany-Turkey, Belgium-Morocco, and France-Morocco. A summary policy paper draws broader conclusions and offers overarching policy recommendations. This report looks specifically into the working of the Austria-Turkey corridor. Findings suggest that the BSSA between Austria and Turkey is broadly working well, with no main substantive issues in the area of pension portability and few minor substantive issues concerning health care portability and financing. Process issues around information and automation of information exchange are recognized and are beginning to be addressed.