Why Singapore Fights Inflation With the Exchange Rate, Not Interest Rates

On 27 July 2026, MAS did something it had done just three months earlier: it tightened policy again. The July Monetary Policy Statement increased the rate of appreciation of the Singapore dollar nominal effective exchange rate (S$NEER) policy band, building on the tightening from April. No press conference. No headline interest rate. No dot plot. If you were watching for the kind of announcement the US Federal Reserve or the European Central Bank makes, you'd have missed it entirely.

That's because MAS doesn't fight inflation the way most central banks do. Singapore is unusual among advanced economies: MAS uses the exchange rate, rather than a policy interest rate, as its primary monetary-policy instrument. Here's why, how it actually works, and what two tightening moves in one year mean for your business loan or your bank's rates.

Why Singapore can't just set an interest rate

Most central banks set a short-term interest rate and let it ripple through the economy — higher rates make borrowing more expensive, which cools spending and inflation.

Singapore can't really do this effectively. It's a tiny, wide-open economy that trades and invests with the rest of the world with almost no capital controls. Economists call this the "impossible trinity" — a country can't simultaneously have free capital flows, an independent interest rate policy, and a managed exchange rate. You can only pick two.

Singapore chose free capital flows plus a managed exchange rate. That's a deliberate trade-off: Singapore's exports and imports of goods and services each run close to 179% and 144% of GDP respectively — so the exchange rate has a far bigger, more direct effect on inflation here than interest rates would.

The price of the Singapore dollar against other currencies feeds almost directly into the cost of living, because most of what Singaporeans buy — food, oil, electronics, cars — is imported.

The mechanism: the S$NEER band

Instead of setting an interest rate, MAS manages the Singapore Dollar Nominal Effective Exchange Rate (S$NEER) — the SGD's value against a basket of currencies of Singapore's major trading partners, weighted by trade volume.

MAS doesn't fix this at one number. It lets the S$NEER float within an undisclosed policy band, stepping in only when it drifts toward the edges. Three levers define that band, and each does a different job.

The slope (rate of appreciation) is the lever MAS most often utilises. A steeper upward slope means the SGD strengthens faster over time — cheaper imports, but pricier exports for foreign buyers. MAS steepened the slope in April 2026 as the Middle East conflict pushed up energy costs, then steepened it again in July, describing the move as building on the April tightening. The last time it went the other way was January 2025, when MAS eased the slope for the first time since March 2020, after core inflation fell faster than expected . It eased again slightly in April 2025 as the external outlook weakened further.

The width of the band allows the SGD more day-to-day room without MAS intervening — useful during volatile or uncertain periods since it buys flexibility without committing to a firm directional stance. MAS last widened the band in October 2010, after re-centring it upward that April, to accommodate volatility from post-Global Financial Crisis capital inflows. It's the least frequently used of the three levers, and its purpose is closer to risk management than direct inflation control.

Re-centring is the most immediate of the three: rather than letting the exchange rate drift there gradually via the slope, MAS shifts the band's centre outright. MAS reserves this for sharp shocks or decisive shifts in stance. The last upward re-centring was October 2022 — MAS's fifth tightening move in 12 months — shifting the band's midpoint up to fight inflation running at multi-decade highs. MAS Core Inflation eased steadily through 2024–2025 and back to the 1–2% range by early 2026. The last downward re-centring was April 2009, during the Global Financial Crisis, after the slope had already been cut to 0% the previous October.

So where do interest rates come in?

Singapore does have market interest rates — SORA, the Singapore Overnight Rate Average, has fully replaced SIBOR as the main SGD benchmark. But MAS doesn't set them directly the way the Fed sets its policy rate. Domestic interest rates are a side effect of the exchange rate policy and global capital flows.

Because Singapore's capital markets are open, local interest rates get pulled toward global rates — especially US rates — adjusted for the SGD's expected appreciation or depreciation. Very roughly:

Singapore interest rate ≈ global interest rate − expected SGD appreciation

What two tightening moves in one year mean for businesses and banks

Importers benefit, exporters feel the pinch when MAS lets the SGD strengthen. With two consecutive steepening moves this year, imported raw materials and goods should get cheaper, while Singapore-made exports become less price-competitive abroad.

Borrowing costs are shaped by global rates and SGD market conditions, not a domestic policy rate. If the Fed is holding or hiking, Singapore businesses generally feel loan rates move too, though the SGD's steeper appreciation path can partly offset this.

Foreign-currency exposure matters more than ever. Given Singapore's trade-to-GDP ratio, most SG-based firms are more directly exposed to MAS's exchange rate stance than to any conventional policy rate — because there isn't one.

For banks, loans and deposits price off SORA, which reflects SGD liquidity conditions and, indirectly, MAS's exchange rate stance and global rate trends. A steeper slope tends to correspond with somewhat lower SGD rates, a factor banks weigh alongside funding mix and loan repricing. Banks running SGD/USD and cross-currency books also treat width and centring changes as relevant inputs for trading and hedging costs.

The takeaway

For a Singapore-based or Singapore-exposed business, reading the quarterly Monetary Policy Statement deserves the same attention treasury and risk teams give a Fed or ECB rate decision elsewhere.

For businesses, right now:

• Reassess FX hedging positions given two consecutive tightening moves in 2026 — a stronger SGD path is now the base case, not a tail risk.

• Revisit cost planning for import-heavy operations; a steeper slope is a tailwind for cost lines denominated in USD or other foreign currencies.

• Exporters and businesses pricing in USD or regional currencies should stress-test margins against continued SGD strength.

  
  

MAS doesn't fight inflation by making it more expensive to borrow. It fights inflation by controlling how strong or weak the Singapore dollar is allowed to get — and in an economy this small, this open, and this trade-dependent, that turns out to be the more powerful lever. Understanding that distinction is the key to reading every Monetary Policy Statement correctly.