She first appeared in Shahid Nadeem's directed drama serial "Zard Dopehar" (The Yellow Noon) aired on PTV in 1995. She is also notable for her performance in drama serials such as Yariyan and Maaye Ni. She also started off as a theater personality and then moved to television. Mumtaz has worked in drama serials such as Meri Zaat Zara-e-Benishan. Sadqay Tumhare, Ali Ki Ammi and Udaari.
Mumtaz made her film debut in 2014 in a drama thriller film Dukhtar, written and directed by Afia Nathaniel. She also starred in a family drama film Moor directed by Jami, released in 2015.