Unlike most other stations with service from multiple different transport companies, at Ōsaki the Rinkai line and JR services are behind the same fare gates, and it is possible to change between JR and Rinkai lines without exiting and re-entering. Passengers using Suica or another IC card will be charged the combined fare when they exit. Passengers holding a Japan Rail Pass and transferring onto the Rinkai line, which does not accept the pass, will need to pay the Rinkai line fare when they exit at their Rinkai line destination. A similar arrangement applies to passengers travelling through from the Saikyō line to Oimachi or another Rinkai line destination.