MAS (Monetary Authority of Singapore)

The Monetary Authority of Singapore (MAS) is Singapore's central bank and its single, integrated financial regulator. It sets monetary policy, issues the Singapore dollar, manages official reserves and supervises banks, insurers, capital markets intermediaries and payment firms. Few other central banks combine all of these roles in one body.

MAS was established under the Monetary Authority of Singapore Act 1970 and began operating on 1 January 1971, taking over functions that had been spread across several government departments. Currency issuance stayed with a separate Board of Commissioners of Currency until the two merged on 1 October 2002. MAS is unusual in steering the economy through the exchange rate rather than an interest rate, which sets it apart from the Federal Reserve or the European Central Bank.

Most central banks steer the economy by turning an interest-rate dial, making loans cheaper or dearer. Singapore trades so much with the rest of the world that the price of its currency matters more to everyday prices than the cost of borrowing. So MAS steers with a different dial: how fast the Singapore dollar rises or falls against the currencies of its trading partners.

Think of a car on a gentle slope held between two lane markings. MAS decides the angle of the slope, how wide the lane is and where it sits, and lets the currency drift within the lane. On top of that, MAS is also the inspector for nearly every financial firm in the country, from big banks to small payment apps.

Before 1971, banking oversight, government accounts and exchange control sat in different offices. The new authority brought them together. Responsibility for insurance supervision followed in 1977 and for securities markets in the 1980s, building the integrated model it has today.

Since 1981 monetary policy has centred on managing the exchange rate. In 2002 the merger with the currency board added note and coin issuance. More recent milestones include the FAST interbank transfer system in 2014, the PayNow service in 2017 and the Payment Services Act 2019. Chia Der Jiun became Managing Director on 1 January 2024.

MAS manages the Singapore dollar against an undisclosed trade-weighted currency basket, measured as the S$ nominal effective exchange rate, or S$NEER. The S$NEER may move within an exchange-rate band whose slope, width and centre MAS can change. Its main goal is medium-term price stability; it intervenes in the foreign exchange market when the rate nears the band's edges.

Because the exchange rate is the target, domestic interest rates are largely set by global rates and market expectations. In terms of the impossible trinity, Singapore keeps open capital flows and capital mobility and gives up control of interest rates, yet it keeps a form of monetary policy independence through the band. MAS has published its monetary policy statements quarterly since 2024.

MAS licenses and supervises a wide range of institutions:

• Banks and finance companies, including the digital banks it licensed from 2020.
• Insurers and insurance brokers.
• Exchanges, fund managers and capital markets services firms.
• Payment service providers under the Payment Services Act 2019.

The Payment Services Act came into force on 28 January 2020. It created three licence classes (money-changing, standard payment institution and major payment institution) covering services such as account issuance, domestic and cross-border transfers, e-money and digital payment tokens. In August 2023 MAS finalised a framework for single-currency stablecoins issued in Singapore. It also runs a fintech regulatory sandbox and sets anti-money laundering rules for the firms it supervises.

MAS holds and invests part of Singapore's foreign exchange reserves, alongside the government investment company GIC. It operates MEPS+, the country's high-value settlement system, and oversees retail real-time payment systems such as FAST. It has also tested tokenised settlement, first through Project Ubin between 2016 and 2020 and then through Project Guardian, launched in 2022 with banks and asset managers. Under a 1967 Currency Interchangeability Agreement, the Singapore dollar is accepted at par with the Brunei dollar.

MAS is a statutory board of the government, run by a board of directors whose chairman has traditionally been a cabinet minister, and by a Managing Director who heads its staff. It is also banker and financial agent to the government and issues Singapore Government Securities on the government's behalf.

Critics point to limited transparency, since the composition of the S$NEER basket and the exact band are not published. Its supervision has also been tested by scandals. After the 1MDB affair it fined eight banks a total of S$29.1 million, and after a money laundering case uncovered in August 2023, involving assets worth about S$3 billion, it imposed penalties of S$27.45 million on nine financial institutions in July 2025 for failing to check customers' source of wealth properly.

• Monetary Authority of Singapore
• Payment Services Act 2019 (Singapore Statutes Online)