You will incur Court filing fees which typically ranges from S$300 to S$500, depending on the documents you need to file.

These fees excludes other fees payable to doctors for the medical report and fees to affirm or swear affidavits, or if you decide to engage a legal professional to represent you in Court.

Please refer to https://www.judiciary.gov.sg/family/file-deputyship-application-standard for more information.