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There is no limit to how much CPF you can use for mortgage payments if you are purchasing a BTO (Build-To-Order) or resale HDB flat with an HDB loan.
For private properties or HDB flats purchased with a bank loan, the CPF usage is capped at 120% of the property's Valuation Limit (VL), which is the lower of the purchase price or the property valuation at the time of purchase. This means you can use up to 120% of the VL from your CPF Ordinary Account (OA) for the down payment, monthly repayments, and other related costs, provided you meet the Basic Retirement Sum (BRS) in your CPF account.
If the remaining lease of the property cannot cover the youngest owner until at least age 95, there will be limitations on how much CPF you can use, and the percentage will be much lower.