The government announced the move in April, but sales have been on hold until the measure was published into law in the Official Gazette.
Under the law, which takes effect Oct. 1, buyers and sellers must each pay a 4 percent tax, and buyers must make a sworn declaration that the money used for the purchase was obtained legally.
Unrestricted sales had previously been limited to cars built before the 1959 revolution, one of the reasons Cuba's streets are about the only place on the planet one routinely finds a multitude of finned American classics from the 1950s such as Chevrolets Bel Airs and Chrysler Imperials, all in various states of disrepair.
Doctors, athletes, artists and others sent abroad on official business were allowed to bring cars back or purchase a boxy, Russian-made Lada or Moscovich from the state. Some senior workers were given company cars, though gas usage is strictly monitored to make sure they are only driven for work reasons.
The new law will allow the sale of cars from all models and years, and it legalizes ownership of more than one car, although tax rates go up slightly.
"It is a very positive step," said Rolando Perez, a Havana resident who was standing in line to get a license to go into business for himself. "They should have done it a long time ago."
The purchase of new cars will be easier than in the past, but still extremely limited. Buyers will have to go to a small number of state-owned dealerships and demonstrate they made the money to buy the car through salary earned in an approved field, as opposed to from remittances sent from relatives abroad.
That would seem to limit such purchases to the same doctors, athletes and others who had been eligible to import cars following official travel abroad.
The 40-page Gazette also says that Cubans who leave the island for good can transfer ownership of their car to a relative or sell it outright. Previously, the state could seize the automobiles of those who emigrated.
While most car sales have been illegal without government permission since the early 1960s, used automobiles have been widely traded in a booming black market for years. Buyers would hand over large amounts of cash under what amounted to handshake agreements, with title not changing hands.
Many cars are generations removed from the original title holder, meaning ownership will have to be untangled once the new regulations take effect.
Because they could be legally traded among Cubans, old cars can fetch prices many times what their value would be off the island, often thousands more than modern cars. Several people involved in such trades told The Associated Press they did not expect prices to be greatly affected by the new law until the government starts to import new cars for wider distribution, and it was not clear when or if that will happen since few Cubans will be able to qualify.
Most islanders make just $20 a month, although doctors and others serving abroad can make much more. Most of it is saved for them in state-managed bank accounts they get access to once they complete their missions. A small number of successful new business owners may also be able to parlay their profits into a new set of wheels, though it was not clear whether they would qualify to purchase new cars.
Cuban President Raul Castro has instituted a series of free-market reforms designed to rescue the island from economic ruin. Cuba has legalized some private enterprise, and allowed citizens to rent out rooms and hire employees.
The government has also announced it plans to legalize the sale and purchase of real estate by the end of 2011.