Most central banks use interest rates as their main tool for controlling inflation, but Singapore takes a different approach. Since 1981, the Monetary Authority of Singapore has conducted monetary policy primarily by managing the exchange rate of the Singapore dollar, reflecting the city-state’s deep integration into global trade. The system is particularly relevant as central banks worldwide weigh inflation risks against economic growth and shifting energy prices.

Why Singapore Uses the Exchange Rate Instead of Interest Rates

Singapore’s economic structure helps explain its unusual policy. The combined value of exports and imports of goods and services exceeds three times the country’s GDP, while about 40 cents of every dollar spent domestically goes toward imports. Currency movements therefore have a direct influence on the cost of food, energy, raw materials and other imported products.

A stronger Singapore dollar makes foreign goods cheaper in local-currency terms, helping contain imported inflation. A weaker currency can have the opposite effect by raising import costs. MAS therefore considers the exchange rate a more effective instrument for managing domestic price pressures than targeting interest rates alone. Its primary objective is medium-term price stability that supports sustainable economic growth.

How the S$NEER Policy Band Works

The central bank does not peg the Singapore dollar to a single currency or hold it at one fixed exchange rate. Instead, it manages the Singapore dollar nominal effective exchange rate, known as the S$NEER. This index measures the currency against a basket of trading partners’ currencies, weighted according to their importance to Singapore’s trade.

MAS allows the index to fluctuate within a policy band and adjusts three parameters. The **slope** determines the rate at which the band allows the currency to appreciate or depreciate over time. The **midpoint** can be shifted to strengthen or weaken the currency immediately, while the **width** determines how much the exchange rate can fluctuate within the band.

A steeper appreciating slope generally represents tighter monetary policy because it supports a stronger currency and helps restrain imported inflation. A flatter slope reduces the pace of appreciation, providing a form of policy easing. MAS reviews the settings regularly in response to economic conditions and the inflation outlook.

What the Framework Means for Markets and Investors

Singapore’s approach does not mean that domestic interest rates are fixed or irrelevant. With capital moving freely across borders, local rates are heavily influenced by global interest rates and expectations for the Singapore dollar. As a result, MAS cannot independently target both the exchange rate and a domestic interest rate that diverges substantially from international conditions.

On October 14, 2026, MAS left its policy settings unchanged, despite expectations of further tightening among analysts surveyed by Reuters. The central bank maintained the prevailing appreciation rate, midpoint and width of the band. Singapore’s economy had expanded 5.4% year over year in the third quarter, while core inflation stood at 2.2% in August. MAS narrowed its forecast for core inflation to 1.5%–2% and projected headline inflation of 2%.

Going forward, markets will monitor imported energy and food costs, global interest rates, economic growth and the pace of inflation. For international investors, understanding Singapore’s exchange-rate framework is essential when assessing the Singapore dollar, local borrowing conditions and the country’s response to external economic shocks. The key question is whether currency appreciation will continue to contain inflation without placing excessive pressure on growth and trade competitiveness.