The council, China's Cabinet, also said that land plots left aside for more than two years will be reclaimed by the government.

The fee, equivalent to 20 percent of the land transaction price, will be levied strictly from now, industry experts said. Previously, the fee was not regarded as obligatory since the government said it might be charged on "principle."

The tougher measures, the latest in a series of macro control policies which aim to cool the country's red-hot real estate market and curb soaring property prices, will likely impact greatly domestic land supply, industry analysts said.

"The nationwide shortage of land supply will probably be eased when such heavy-handed measures are implemented," said Xue Jianxiong, head of research at Shanghai Youwin Real Estate Information Service Co. "By imposing (the fee) stringently, the government will be able to have an overall control of its land reserves."

Land left untouched for more than two years will be taken back by the government. Plots that couldn't be legally reclaimed should be dealt with as quickly as possible in appropriate ways such as changing their designated purpose, bartering, assign temporary uses for them or retain them for government reserves, according to the notice.

The notice also said the Ministry of Land and Resources should join forces with other relevant departments to work out detailed plans regarding land appreciation fees on idle plots.

A tight land supply has been long attributed as the major reason for surging housing prices across the country.