The company had sold 61,660 vehicles in the same month last year.
Domestic passenger vehicle sales dropped to 10,974 units in January, down from 15,209 units a year earlier.
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Tata Motors sold 8,463 units of Nano, Indica and Indigo cars and 2,511 units of Sumo, Safari, Aria and Venture vehicles, the company said in a statement.
In the commercial vehicles segment, domestic sales declined about 40% to 25,683 units from 42,571 units in the corresponding month of the previous year.
Exports were 1.44% lower at 3,824 vehicles, Tata Motors said.