What is Upside-Only Risk? Definition, Formula, and Benchmark

Upside-only risk contracts let a provider group participate in shared savings without downside loss exposure. If attributed-member TCOC falls below benchmark, the provider earns a savings payment; if TCOC exceeds benchmark, the provider owes nothing. The structure is favored for first-time ACO participants building operational capability and for smaller groups lacking the capital to absorb downside risk.

MSSP Basic Track operates upside-only in its first performance years with a mandatory glide-path to two-sided risk by year four. ACO REACH has no upside-only option — REACH participation always involves two-sided risk. Commercial ACO contracts frequently begin upside-only and transition to two-sided as both parties build confidence in the measurement and settlement mechanics.

CMS and health-policy researchers have consistently argued that upside-only contracts produce limited behavior change. Providers face no financial consequence for cost over-runs, so the motivation to invest in utilization management, specialist network design, and complex-case programs is blunted. CMS MSSP performance data supports this thesis: upside-only ACOs generate smaller and less durable savings than two-sided peers.

The policy direction is therefore to phase out upside-only structures. MSSP's glide-path forces progression to two-sided risk; ACO REACH's design eliminates the option; commercial payer contracts increasingly include mandatory downside-risk transitions. By 2028 most federal ACO participation will be two-sided.

Despite these dynamics, upside-only remains the appropriate entry point for many small or newly-formed ACOs. Capital constraints, limited operational infrastructure, and limited historical data make downside-risk participation imprudent for groups that have not yet built the core competencies. The upside-only period serves as a capability-building phase.

Operational priorities during upside-only participation should focus on data infrastructure (claims aggregation, attribution, TCOC dashboards), provider engagement (shared-savings distribution transparency, quality-score understanding), and utilization management capability (specialty referral patterns, site-of-service optimization, post-acute care coordination). Groups that use the upside-only phase to build these capabilities successfully transition to two-sided participation; groups that treat upside-only as a destination typically underperform and lose participation over time.

RCM-function implications are moderate during upside-only participation. Financial forecasting focuses on modeling expected savings distributions; there is no need for downside-loss reserving. Data infrastructure requirements are similar to two-sided contracts. Contract administration is simpler because settlements flow only in one direction.

From a finance-leadership view, Upside-Only Risk is one of a handful of metrics that quietly pay for themselves every time they improve. A disciplined program that keeps Upside-Only Risk within a target band reduces working-capital lock-up, shortens the gap between posted charge and collected cash, and — because the same front-end workflows improve shared savings at the same time — compounds the benefit on adjacent measures too. The editorial convention on this site is to read Upside-Only Risk together with the two sided risk curve, because the two together describe whether a practice is collecting faster, writing off less, or simply trading one problem for another.