Home > Personal > Personal Lending > Mortgage > Mortgage Resources > Glossary > Fixed Installment Fixed Installment November 9, 2021 The monthly payment due on a mortgage loan which includes both principal and interest.You Might Also Like: Living QuartersMortgage Lending for Veterans at Bank Five Nine All Things CommunityReviewing Random Acts of Kindness 2023 Everyday MoneyWhat are ACH Payments and How Do They Work? Living QuartersUnderstanding Mortgage Interest Rates Family MattersFun Games to Teach Kids About Money