The Finance Ministry has last week announced an import tax revision for cars with dealers claiming that the new tariff makes import of certain car types very difficult.
While the duties on cars below 1300 cc have been reduced, the duty applicable on cars over 1,500 cc goes up by more than double.
Karunanayake said the new tax revision was due to two reasons; car taxes were aimed at discouraging imports "until the road network improved".
"The second issue is the number of vehicles that has flooded our roads last year. About 90,100 cars were imported last year compared to 45,000 in 2014. We need to reduce imports and ensure revenue at the same time," he said.
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The minister also listed 15 types of cars as having benefited from the new tax revision, qualifying for lower duty rates.
He said in the previous system of evaluating a car for customs duty there were loopholes as the importers used to under value the vehicles.
He said the new tariffs were imposed based on the proposals from the car importers.