An experimental study of tapered built-up cold-formed channel sections was conducted by the authors and described in this paper. The test plan involved testing specimens of varying geometries in bending, compression or eccentric compression cases. The investigation concerned the influence of parameters such as the slenderness of section parts, difference in section height and spacing of intermediate plates on the resistance of the members and possible buckling failure modes. Although most of the analysed sections were classified as Class 4, i.e. susceptible to local and distortional instabilities, global forms were mainly observed. The maximum experimental load values were then used to verify the accuracy in determining the overall resistance of the considered members using the General Method with some “engineering” simplifications. The comparison shows that General Method with implemented assumptions provide a safe estimate of the resistance in the vast majority of cases and in this form can be used to calculate this type of members.