You may refer to Taking Cash In and Out of Singapore page for more information on bringing in Physical Currency and Bearer Negotiable Instruments (CBNI)* of value exceeding S$20,000 (or its equivalent in a foreign currency).
*Physical currency refers to coins and printed money. Examples of bearer negotiable instruments include a bill of exchange, cheques pay to “Cash”, cheques with “or bearer” not crossed out, promissory note, bearer bond, money order and postal order.