I often receive enquiries on stamp duty if it can be paid using CPF. The answer is YES!! However, it is not so straight forward as deducting the CPF for stamp duty.
I consulted a lawyer recently to ask about the whole process of stamp duty as this helps to add value to my client. This is what he share:
Upon exercising the option, stamp duty need to be paid in 2 weeks (or 4 weeks) time. However, the withdrawal of CPF takes a longer time. Therefore in most cases, clients pay stamp duty using cash and when the CPF process is done, stamp duty will be reimburse back to the client in cash.
Hope this information is useful!