The impact of a cylindrical liquid jet with a hemispherical tip on an elastic-plastic body uniformly covered in the impact domain by a liquid film has been studied, depending on the thickness of the film. The jet is directed orthogonally to the body surface, which is plane. The liquid in the jet and the film is water; the material of the body is Monel 400. The radius of the jet is $$R$$ , its velocity is $$V=300$$ m/s. The film thickness $$d$$ is varied in the range $$0-0.2R$$ . The action of the jet is considered until it becomes nearly stationary. A similar configuration can occur during the collapse of cavitation bubbles nearby a solid. The dynamics of the liquid (in the jet and the film) and the surrounding gas is calculated by the CIP-CUP method without explicit interface tracking using dynamically adaptive Soroban grids. The body is modeled by an ideal elastic-plastic semi-space, in which the deformations are considered to be small; the plasticity effect is realized according to the Mises condition. The dynamics of the body is calculated by a UNO-modification of the Godunov method of the second order of accuracy. Some features of the body surface loading and the corresponding response of the body (the deformation of its surface, the changes in its stress state) resulting from varying the liquid film thickness have been revealed. It is shown, in particular, that the body surface pressure profiles, initially very different for various $$d$$ , after the time moment $$t\approx R/V$$ become approximately the same (with a small exception at the periphery) and closely correspond to the profile arising under the stationary action of a similar jet of incompressible liquid. The jet impact results in the formation of a very shallow pit on the body surface (with a depth of about $$10^{-3}R$$ ). At $$d=0$$ , the depth of the pit in its center is approximately two times greater than at $$d=0.2R$$ .