Unlike most analyses of Social Security reforms, this paper explicitly considers interactions with the Supplemental Security Income (SSI) program. Using a microsimulation model, we examine reducing Social Security benefits by the percentage required to approach 75-year solvency. We then add options for attenuating the effects on low-income beneficiaries. In the simulated reforms, we compare benefit receipt patterns, poverty rates, and winners and losers in 2022. Substantial reforms are necessary for SSI to play a more effective income security role. Among the limited set of reforms we consider, Social Security minimum benefit plans would more effectively reduce poverty among low-income beneficiaries.