PurposeCorporate-NGO partnerships are gaining increasing importance as part of a company's CSR effort. This study aims to understand which communication tactics (CSR motive, CSR message frame, CSR fit) lead to more positive consumer outcomes in the context of corporate-NGO partnerships, and whether consumer skepticism and consumer trust mediate the proposed relationships.Design/methodology/approachAn online experiment was conducted (N = 298) to examine the theoretical predictions, involving a 2 (CSR motive: firm-serving/public-serving) x 2 (CSR message frame: narrative/expositive) x 2 (CSR fit: high/low) between-subjects design.FindingsThe results confirmed that consumer attitudes and electronic Word-of-Mouth (eWOM) can be affected by CSR motives and CSR fit. Also, CSR skepticism and consumer trust both mediate the relationship of CSR motives and consumer outcomes.Practical implicationsThe results of this study make a strong case for expressing public-serving CSR motives and refraining from firm-serving CSR motives when communicating about a corporate-NGO partnership to consumers.Originality/valueFocusing on the communication tactics of corporate-NGO partnerships extends existing literature by uncovering whether and how the factors driving effective communication in other CSR activities can be applied to the context of corporate-NGO partnerships.