SINGAPORE (BLOOMBERG) - Singapore homebuyers will drive harder bargains in an already depressed housing market as new rules that require developers to disclose discounts and other perks unmask the actual value of properties for sale.

Starting Friday, the Urban Redevelopment Authority will publish weekly net prices on home transactions that will take into account incentives and rebates, such as those for stamp duties, to improve transparency.

"It will give homebuyers more bargaining opportunities," said Donald Han, managing director at real estate broker Chesterton Singapore Pte. "Buyers are already asking for more perks, so this gives them additional information that they can use to negotiate a better price."

Hefty furniture rebates became the subject of a S$181 million lawsuit in November after United Overseas Bank Ltd. claimed it was a "victim of a conspiracy" and handed out larger-than-permitted housing loans after some buyers at the luxury Marina Collection on Sentosa island didn't declare perks that cut prices by as much as 34 per cent.

Now, freebies such as luxury goods vouchers, jewelry and furniture used to entice homebuyers will be made public. Home sales dropped to a six-year low last year, while prices fell for a sixth straight quarter in the three months ended March 31, the longest losing streak in more than a decade.

Developers hard pressed to sell apartments have been peddling offers such as discounted prices on select units for a short time period, known as "star buys", while others offer furniture rebates or luxury-goods vouchers amounting to about 1 per cent to 2 per cent of the transaction value.

Home sales have been hurt by the government's campaign to cool property prices in Asia's second-most expensive housing market. Measures since 2009 include a cap on debt repayment costs at 60 per cent of a borrower's monthly income and higher stamp duties and real estate taxes.

"Developers will become more competitive when everyone's discount is disclosed," said Xian Yang Wong, manager of research and consultancy at property brokerage OrangeTee, who estimates the discounts range between 10 per cent and 15 per cent. It "will be good for the market."

Developers have been reporting net prices on monthly sales since 2013. Failure to comply with new rules may include a maximum fine of S$100,000 and a jail term for as long as three years.

"URA is just filling the gap in the reporting," said Alan Cheong, a Singapore-based director at broker Savills Plc. "There is this suspicion that developers are giving out hefty discounts, but it's not true. Those are one-off cases."

The latest rules will force developers to price the homes competitively when they start marketing new projects, said Alice Tan, Singapore-based head of consultancy and research at brokerage Knight Frank. She estimates discounts will range from 3 per cent to 8 per cent.

"In light of the weak market, developers need to get the price right at the start, in order to garner immediate interest from buyers," Ms Tan said.