 This paper examines the effect of composition on the Auger parameter alpha in tin-based perovskites. It was found that the variation in alpha is dependent on the oxidation state, coordination, and local chemistry of the tin atom. This provides a framework for understanding the degradation of tin-based perovskites and their composition. Additionally, it allows for more accurate tracking of degradation and composition of these materials. This article was authored by Alexander Wixorek, Huaguay Lai, John Paul Pius, and others.