The assets of both husband and wife are jointly owned after marriage and each partner is entitled to 50 percent of the estate. If a foreigner wishes to protect assets that predate the marriage, a prenuptial agreement (Surat Pernyataan Harta) is required. A prenuptial agreement must be made before getting married and it cannot be made retroactively. The agreement is legalised at the same time the marriage is registered with the local Civil Registration Office (Kantor Catatan Sipil) and the Office of Religious Affairs (Kantor Urusan Agama).