In general, the interactive loads, viz. axial (V), shear (H), and moment (M), act together and are transferred from associated columns to the foundation located on an undrained clay slope. In addition, the combined load effect on the foundation’s capacity is generally estimated using a decoupled approach and is primarily unavailable in standards and literature. After conducting finite element limit analyses using OptumG2 software, this article estimates the limit loads for a strip foundation resting on undrained clay slopes with zero edge distance. Finally, the V-H-M capacity envelope is developed using modified ‘Probe’ analyses. A detailed comparison between the capacity envelopes of the same foundations located on flat ground and slopes is presented to underline the effect of slope inclination, β, subjected to different load combinations.