To boost agricultural output and food security, the Kenyan government has given farmers agricultural subsidies since 2004. Alego Usonga does not have access to or use agricultural inputs since most farmers in the study region cannot afford certified seeds and fertilizers. Obstacles to their acceptance and usage include the expensive cost of new and better agricultural inputs and technology, erratic delivery networks, and a lack of technical expertise in their application. Due to decreasing productivity, farmers today face food insecurity and limited agricultural income. We looked at smallholder farmers in the Alego Usonga sub-county of Siaya County to see how agricultural input subsidies affected crop yields and incomes. 317 Usonga smallholder farmers that get input subsidies are the subject of the investigation. The goal of the research was to determine how to input subsidies affected household income, crop yields, and smallholder farmers' acceptance of input usage in the study region to provide a definite answer to the investigation's objectives. Information from respondents was acquired by utilizing standardized questionnaires. The last samples were then randomly selected from the population strata after that. Afterward, the outcomes were evaluated statistically and qualitatively using SPSS version 19. The information was assessed using descriptive and inferential statistics like the correlation and Chi-square tests. Tables, graphs, and percentages were often used to show and evaluate quantitative data. The narrative analysis method was utilized to analyze the qualitative data. This method employed themes to compress the material, classify it into useful categories, summarize and contextualize the text, and find and understand linkage patterns. The main conclusions showed that participants comprised 55.5% of women and 44.5% of men. Input subsidies, according to the majority of respondents (62.1%), were thought to boost crop output (96.4%); fertilizer subsidies, according to the majority of respondents (61.5%); and crop yields, according to the majority of respondents (97.9%). The results show that input subsidies raise the yields and profits of smallholder farmers. Additionally, research demonstrates that input subsidies significantly impact adoption since they increase resource accessibility and consumer awareness. The paper recommended further research on an integrated strategy that uses agricultural technology, quick input delivery, and extension services to boost smallholder farmers' yields and profitability.