Slope stabilization is a crucial aspect of geotechnical engineering and civil construction, aimed at mitigating the risk of landslides, erosion, or other forms of slope instability. Soil nailing is a method that involves drilling and installing reinforcement elements (nails) into the slope to enhance stability. In this present study, for slope stability analysis in reinforced conditions, nails with specific parameters have been used. Here, nail inclination angle, one of the important factors contributing to the stabilization of the nailed slopes, has been varied, and its relationship with the factor of safety has been studied accordingly to analyse its effect on stability of slopes. The numerical analysis of slope stability by deriving the factor of safety has been performed using the Limit Equilibrium Method of Bishop with GeoStudio 2018 R2 (SLOPE/W) software and the Finite Element Analysis with PLAXIS 2D CE V20 software. The analysis has been carried out on a particular slope with cohesive soil strata. Slope stabilization using the soil nailing method was analysed with nail inclination angles ranging from 0° to 45°, with a focus on how inclination angles impact the Factor of Safety (FOS). Other nail parameters, such as nail diameter, nail length, and nail spacing, were kept constant. The analysis revealed that increasing the nail inclination from 0° to 35° consistently improved the FOS by 3% to 6% per 5° increment, reaching an optimum at 35° before declining beyond this angle.