The Swiss squad said on Wednesday morning that the C32, the chassis the team will use during the 2013 season, was now fully homologated to begin testing next year.
Cars must pass all crash tests before they can take to the track in testing. The rule was introduced at the start of 2012.
"The C32 chassis and safety structures have passed their FIA safety tests. So, fully homologated and ready for winter testing," said Sauber on Twitter.
Winter testing kicks off at the Jerez circuit on February 5.