We consider deformations of G -structures via the right action on the frame bundle in a base-point-dependent manner. We investigate which of these deformations again lead to G -structures and in which cases the original and the deformed G -structures define the same instantons. Further, we construct a bijection from connections compatible with the original G -structure to those compatible with the deformed G -structure and investigate the change of intrinsic torsion under the aforementioned deformations. Finally, we consider several examples.