Covered faces has been linked with impaired emotion recognition, yet it is entirely unexplored how an occlusion due to face masks may affect individuals' behavior in economic decisions. Across two studies, we explored whether partially covered faces (due to mask wearing or a horizontal black bar), and emotion displayed by the Responder influence peoples' sharing behavior in the Ultimatum Game and perceived fairness of one's proposal.Study 1 showed participants were more willing to equally share their resources with a happy face (compared to a neutral one). In addition, they were more willing to make a fair proposal when the person displayed was not wearing a face mask. Our results also provide evidence that, when people had to judge how fair was their proposal, participants rated a fair proposal as fairer when when Responders showed happy faces without masks, while unfair proposals were rated as fairer with happy masked faces; similarly, angry faces led to fairer ratings for fair offers without masks and unfair offers with masks. Study 2 partially confirmed previous results, highlighting how a simple occlusion on the face does not have a direct effect on the proposal, but moderates the effect of the displayed emotions.These findings indicate that social interactions might be affected by face occlusion, especially when it is represented by a face mask. Indeed, people might judge the same behavior in different ways based on the fact that their counterpart has a partially covered face.