We examine the effect of undiagnosed memory disorders on credit outcomes using individually-matched nationally representative credit reporting and Medicare data. We find effects of early stage disease, years before diagnosis, on a wide range of financial outcomes, including credit card account payment delinquency and amount of delinquent balance, credit utilization among credit card account holders, mortgage delinquency and delinquent balance amount, and credit scores. Effects are pervasive, affecting seniors in single and coupled households, racial/ethnic minorities and non-minorities, and older adults living in areas with higher and lower education levels. Early stage effects are greater among singles and Black individuals.