Yes, when you take over full ownership of a property from your ex-spouse, you will generally need to refund their CPF account. This refund includes both the principal amount your ex-spouse used for the property purchase and any accrued interest.
However, the Court now has the discretion to order the property transfer without requiring the full CPF refund to be made immediately to your ex-spouse's account.
If you later sell the property, you will be responsible for refunding your CPF account with the total amount withdrawn by both parties. This includes your ex-spouse's CPF contributions that were not refunded during the transfer, plus your own CPF withdrawals with accrued interest.