The change in thickness and work hardening that arise during the forming process are generally ignored in quasi-static analysis for Seat belt pull when performed on vehicle body. However, it is a well-known effect that the physical properties of steel can alter significantly during the manufacturing process. This comprises an increase of material stiffness due to plastic deformation as well as gage changes. Generally, these changes are of very local nature and in the past, crash software tools didn't support the introduction of these local effects, so that they couldn't be taken into account. In the meanwhile LS-DYNA has the capability to import information provided by stamping tools. Thereby a very important part of the material properties can be introduced into the quasi-static simulation models, leading to a significantly increased correlation to test results. The impact of this effect on quasi-static simulation was analyzed for a recent vehicle project and will be discussed in detail. Forming results for critical parts in vehicle were calculated using a stamping analysis code. These were imported into the Seatbelt pull model (on body) and results were compared with and without the forming effects.