Thls paper descrlbes the formulatlon of the Ultlmate LlmltState of punchlng reslstance of prestressed slabs proposed In the new FIP Recomo mendatlons for the deslgn of post-tensloned slabs and foundatlon rafts. The prestress effects were consldered on the actlon slde deflnlng an effectlve applled punchlng load. For the evaluatlon of the punchlng reslstance, CEB-FIP Model Code 90 was followed. An example of the appllcatlon of thls method to an Interior column of a prestressed flat slab 15presented. Rg. 4 Contrai perimeter u,