Auto major Mahindra & Mahindra today reported six per cent decline in total sales at 39,930 units in January.
It had sold 42,685 units in the same month last year, the company said in a statement.
M&M's domestic sales declined by eight per cent to 37,045 units last month as against 40,324 units a year earlier.
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Four-wheeler commercial vehicle sales fell 14 per cent to 12,919 units last month as against 15,100 units in year-ago month, M&M said.
Exports were up 22 per cent at 2,885 units from 2,361 units in the same period a year earlier.
M&M Chief Executive (Automotive Division) Pravin Shah said: "The first month of 2015 has not been encouraging as the effect of the withdrawal of excise duty subsidy is clearly evident.
"Unfortunately, the segmented recovery which we were witnessing over the last couple of months has been impacted with the excise duty change."
The company hopes that the upcoming Budget will have some positive news for the auto sector, he added.