He started his political career by contesting in the district panchayat and he became a district panchayat member in 1996, that same year he was also elected as the vice-president of the panchayat.
Tamta unsuccessfully campaigned as an independent in the 2002 Assembly elections for the Someshwar seat. On the BJP banner, he ran again in 2007 and was able to obtain entry into the Dehradun Assembly.
He fought the Lok Sabha elections for the first time in 2009, but he lost. 2012 marked his first legislative victory when he won from the Someshwar constituency.
He fought the Lok Sabha elections in 2014, which he won. In the Lok Sabha elections of 2019, he repeated his victory again.
Tamta was elected to the Uttarakhand Legislative Assembly twice, first in 2007 and then again in 2012. Additionally, he has held positions in the Uttarakhand government as a Minister of State from 2007 to 2008 and as the Cabinet Minister from 2008 to 2009.
During the first Modi administration, he was the Union Minister of State for Textiles.[4]