This essay examines four account books from the early fourteenth century kept by three religious officials serving as treasurers of the Florentine Commune: a Cistercian monk from S. Salvatore a Settimo and two Servite friars from SS. Annunziata. Through an analysis of these records, the study highlights the widespread diffusion of bookkeeping in fourteenth-century Florentine society, shedding light on the social and cultural dynamics of a phenomenon that engaged both clerical circles and the lower urban classes.