Districts across the country are planning how to invest huge influxes of one-time ESSER funds -- targeting funds toward meeting urgent academic and social-emotional recovery needs, as well as redesigning better, more equitable approaches to teaching and learning. But short-term investments are often not enough to generate meaningful long-term change, and many districts will want to sustain the changes they are funding with ESSER dollars beyond the three-year period. Therefore, district leaders will need to begin planning "and investing" for sustainability. In this brief, we outline four considerations to help district teams plan their ESSER spending with long-term sustainability in mind.