Extracted from Building Maintenance and Strata Management (BMSMA) as references for all:
"For unsold units, the developer is obliged to pay the equivalent maintenance charges payable by purchasers from the date the maintenance fund is set up, which should not be later than three months from temporary occupation permit (TOP).
For units sold before temporary occupation permit (TOP) and handed over to purchasers, the developer shall collect all maintenance charges due and payable from the purchasers of every lot and pay all such maintenance charges into the maintenance fund. Maintenance charges for such purchasers are due and payable either from the date of taking possession or 15 days after Notice of Vacant Possession, whichever is earlier, in accordance with the Sale and Purchase Agreement.
For units sold before temporary occupation permit (TOP) but not handed over, the developer is obliged to pay the equivalent amount payable by purchasers with effect from the date of establishment of Maintenance Fund until they are due and payable by the purchasers. However, the developer is given a deferment period of three months (i.e. a grace period) from the date of temporary occupation permit (TOP) to pay to the fund all amounts due for these units.
For units sold on or after temporary occupation permit (TOP), the developer shall pay the maintenance charges before the expiration of three months from the date of temporary occupation permit (TOP) or from the date the maintenance fund is established, whichever is earlier."
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On a side note, the amount of contributions for maintenance are based on your share value. Usually all subsidiary proprietor are encourage to attend the first AGM so as to better understand how the management and sinking fund is determined. In future should there be a shortfall in the management or sinking fund, then there could be a special levy which shall be determined at General Meeting.