In a negative sales, do the sellers have to top up their CPF refund from their CPF accounts?

In a negative sale of an HDB flat, the sellers do not need to top up the shortfall in cash to cover the CPF refunds, provided the property is sold at or above its market value.

Here’s how it works: After paying off the outstanding housing loan, if the remaining sale proceeds are not enough to cover the full CPF refunds (including the principal amount and accrued interest), the sellers are not required to make up the difference in cash. Instead, the CPF refunds will be pro-rated and returned to the sellers' CPF accounts in proportion to the amount of CPF each seller had used towards the property.

This means that while the sellers may not get back the full amount of CPF monies they used, they are not obligated to pay the shortfall from their own pockets, as long as the property was sold at market value or higher.