The present invention is directed to Tofacitinib mono-oxalate salt. The Tofacitinib mono-oxalate salt can be in amorphous form. The invention is also directed towards apharmaceutical composition comprising Tofacitinib mono-oxalate salt, and a process for preparing the composition. The Tofacitinib mono-oxalate salt can be used to prepare Tofacitinib mono-citrate salt. Another aspect of the invention is a process for preparing Tofacitinib mono-citrate. The Tofacitinib mono-oxalate salt is also useful as a medicament for the treatment of cancer.
