A key feature of the Medicare Shared Savings Program (MSSP) methodology is the minimum savings rate (MSR) and minimum loss rate (MLR). Accountable care organizations (ACOs) that participate in the MSSP are familiar with these corridors because they can mean the difference between receiving shared savings and receiving nothing. On the other hand, for ACOs currently taking downside risk, the MLR provides a buffer that neutralizes potential losses. This paper explores the MSR/MLR options available to ACOs and presents perspective on what ACOs should consider when selecting the MSR/MLR under an MSSP track with downside risk.