Land Rover defender jeeps auction by state entities were also being converted 5-door luxury station wagons by changing the body.
"The difference between the tax payable for a new/used imported vehicle similar to that of the converted vehicle on the date of registration of the converted vehicle and the tax already paid on the converted vehicle at the time of its importation, should be paid as a surcharge to the Government," the information office quoted the cabinet paper.
"The registration of such converted vehicles under the above conditions should be completed by 2013-03-31 and registration of such vehicles after the above date should not be permitted under any circumstances."
Analyst say retroactive taxes and laws, which are ad hoc in nature undermine the certainty that should come from the rule of law.
In a free country it is the practice of rulers to 'grandfather' any mistakes of the state in drawing up laws and make changes applicable to the future.In free countries with strong constitutional guarantees of liberty to citizens, so called ex post facto laws are specifically prohibited.