This study examined the effect of accounting software on the business performance of manufacturing companies in Calabar Metropolis, Cross River State. A quantitative research approach was adopted, focusing on five key characteristics of accounting software: efficiency, reliability, ease of use, data quality, and accuracy. Data were collected using a self-administered, semi-structured questionnaire distributed to a sample of 150 respondents selected through convenience sampling from 15 registered manufacturing companies in the area. The results of the regression analysis revealed that all five characteristics had a positive and significant impact on business performance, with accuracy having the highest standardized coefficient (β = 0.367, p = 0.000), followed by data quality, ease of use, efficiency, and reliability. These findings confirm that the adoption and effective use of accounting software systems enhance operational efficiency, data management, decision-making, and overall organizational performance. The study underscores the critical role of accurate and reliable financial information in driving business growth and economic development, emphasizing the need for manufacturing firms to invest in robust accounting systems.