Food insecurity is a pressing concern in Malawi, impacting around 5.4 million rural households. In recent years, non-farm businesses have become an increasingly important source of income and employment in Malawi, particularly in rural areas where agriculture is the dominant sector. These businesses can provide a valuable source of supplementary income for smallholder farmers. Thus, the main objective of the study was to assess the impact of non-farm businesses contribution to household food security and nutrition in Malawi and identify the factors influencing their impact. Using propensity score matching (PSM), on secondary data from Malawi's National Statistical Office (NSO). The study followed a two-stage approach, employing probit and multiple linear regression models to analyze determinants of non-farm businesses, food security, and nutrition. The factors that influence household food security positively include gender, household head's age, loan access, household size, and education on food security, while factors like region, marital status, extension access, and plot size can affect food security negatively. On the other hand, probit model revealed factors that affects nutrition namely household size, market access, and yield. Moreover, the adoption of non-farm businesses was affected by the household head's gender, education, extension access, region, and household size, while factors such as age, loan access, marital status, and plot size inhibit adoption. The PSM model demonstrated a positive average treatment effect of non-farm businesses on household food security and nutrition showing that non-farm businesses improve household food security and nutrition. Therefore, the study recommends (1) promoting gender equality, (2) enhancing access to credit, (3) region-tailored interventions, (4) education enhancement, (5) improved market access.