Singapore's monetary policy: the three levers of the S$NEER band

The S$NEER band and its three levers: how Singapore sets policy

Interest-rate changes are the usual weapon against inflation for most central banks. Singapore, however, works differently. Policy is set by the Monetary Authority of Singapore, which manages the Singapore dollar’s value against a basket of currencies from its trading partners. When the MAS “tightens,” the Singapore dollar is allowed to appreciate more quickly, reducing the cost of imports and easing price pressures. When it “eases,” that appreciation is slowed or reversed.

That explains why the decision on Wednesday to keep policy unchanged was framed purely in terms of an exchange-rate band, with interest rates not mentioned at all.

Why the exchange rate is the chosen tool

Few economies are more open than Singapore’s. It imports the bulk of what it consumes — food, fuel, raw materials — and trade flows are sizeable next to the economy’s overall size. That gives the exchange rate far more influence over prices than domestic interest rates have.

A practical constraint is at work as well. Capital enters and leaves Singapore freely. For a central bank in an open-capital environment, managing the exchange rate and managing interest rates at the same time is impossible; one has to be chosen. MAS picked the currency in 1981, and domestic interest rates now tend to track global rates, with the US the main influence.

Understanding the S$NEER

The S$NEER — short for Singapore dollar nominal effective exchange rate — measures the Singapore dollar against a trade-weighted basket of currencies from its leading trading partners. The composition and weights are not made public by MAS. The authority manages the S$NEER within a policy band and steps into the currency market when needed to keep it there.

The three levers of policy

Policy changes at MAS come through three band features, none of which the authority spells out exactly.

• Slope — the rate at which the currency is allowed to appreciate. The band follows a gradual, normally upward, trajectory. Tightening comes from a steeper slope, which lets the Singapore dollar gain value more quickly; a flatter slope is easing. Wednesday’s decision left the slope as it was.
• Centre — the band’s midpoint. In a single move, known as re-centring, MAS can raise or lower the midpoint. An upward shift produces a one-off strengthening right away and sends a firmer tightening signal than a slope increase would. The centre was kept unchanged on Wednesday.
• Width — the amount of fluctuation allowed. More room to move comes from a wider band, often deployed during volatile market conditions. A narrower band indicates firmer control. This, too, was left unchanged.

Although analysts infer the band’s slope and width from how the currency trades, MAS withholds the precise settings. Secrecy around the parameters lets the authority adjust policy without prompting bets against specific levels.

How often MAS reviews policy

Policy reviews take place four times annually — in January, April, July and October — after the switch in 2024 from a twice-yearly calendar. Announcements come out early in the morning in Singapore, roughly midnight GMT.

The inflation measure that counts

Core inflation — which strips out accommodation and private transport — is the measure MAS concentrates on. Those excluded items are shaped to a large degree by government measures and by cycles in housing and car ownership; removing them yields a clearer picture of underlying price pressures. MAS projected on Wednesday that core inflation would average 1.5% to 2.0% in 2026 and would ease more discernibly from mid-2027.

What the hold means

With every one of the three levers untouched, MAS left the Singapore dollar on its current appreciation path. Imported inflation therefore remains under some constraint, but the degree of restraint has not been raised. All 10 analysts surveyed by Reuters had predicted a tightening — probably a steeper slope — making the unchanged decision a dovish surprise against that backdrop, even if the overall policy bias is still toward tightening.

A trader’s guide to MAS statements

In any MAS statement, the words to look for are “slope,” “width” and “centre.” A change in any of those is the actual policy move. The slope dictates the Singapore dollar’s medium-term path against the basket, whereas re-centring can trigger a sudden, sizable shift. With inflation in Singapore so responsive to import prices, energy above all, oil prices frequently signal the likely next MAS action better than domestic rates do.