How strong is too strong for the Swiss Franc?

The Swiss Franc (CHF) is once again approaching levels that tend to make policymakers uncomfortable.

With EUR/CHF drifting near 0.90 and USD/CHF slipping toward the mid-0.77 area, markets are beginning to ask a familiar question: At what point does currency strength become a policy problem for the Swiss National Bank (SNB)?

Recent remarks from SNB Chairman Martin Schlegel suggest the central bank is already aware of the risk. 

Speaking in late February, Schlegel reiterated that the SNB’s main tools remain the policy rate and, where necessary, interventions in the currency market. That wording is hardly accidental. For investors familiar with Switzerland’s monetary playbook, it is a reminder that foreign exchange intervention remains very much part of the toolkit.

Low inflation, strong currency

The macro backdrop helps explain why the issue is resurfacing.

Swiss inflation remains extremely subdued. Consumer prices rose just 0.1% YoY in January, far below the levels seen across most advanced economies. At the same time, economic activity appears modest, with GDP expanding only 0.1% QoQ and 0.7% YoY in the fourth quarter.

A strong Franc plays a role in both dynamics.

Indeed, currency appreciation puts import prices under downside pressure and thus helps contain inflation. Another effect is that it also tightens financial conditions and weighs on export competitiveness in an economy like the Swiss one, which relies heavily on international trade.

For policymakers, that creates a delicate balance.

The SNB’s policy dilemma

The SNB has historically tolerated a strong currency when inflation risks were elevated. In recent years, the Franc even served as a useful tool in the fight against imported inflation.

Today the environment looks different.

Inflation pressure, as Schlegel noted, has “barely changed” and remains extremely low. The central bank expects inflation to rise modestly in coming months, but officials also acknowledge that temporary negative readings are possible.

Against that backdrop, further Franc appreciation could become problematic.

That said, if CHF strengthens too rapidly, it risks pushing inflation even further below target while adding pressure to an already subdued growth outlook.

Markets testing the SNB

This is where markets enter the picture.

Whenever the Franc strengthens sharply, traders begin to test the central bank’s tolerance. That said, safe-haven demand, geopolitical uncertainty and global risk aversion can all drive capital toward Switzerland, prompting its currency to attract (undesired?) heat regardless of domestic fundamentals.

But that strength can invite its own resistance.

If markets conclude that the SNB is becoming uncomfortable with the pace of appreciation, intervention risk rises. The central bank has a long history of stepping into currency markets when needed, often decisively.

Schlegel’s recent reminder that the SNB remains “ready to intervene where necessary” suggests policymakers are keen to keep that option visible.

The macro backdrop 

External factors could amplify the challenge.

Schlegel acknowledged that US tariffs and the broader rise in global uncertainty are beginning to weigh on economic activity. According to recent surveys, around a quarter of Swiss companies are already reporting negative effects. At the same time, persistent geopolitical tensions are continuing to channel safe-haven flows into the Swiss Franc.

In that environment, the SNB faces a familiar dilemma: allowing the currency to appreciate risks tightening financial conditions, while resisting it too aggressively risks reigniting accusations of currency manipulation.

Bottom line

For now, the Swiss Franc’s strength reflects global uncertainty as much as domestic fundamentals.

But currency markets have a habit of pushing until a central bank signals its tolerance. 

With inflation barely above zero and growth subdued, the SNB’s tolerance for further appreciation may not be limitless.

Safe-haven flows can lift the Franc quickly.Intervention risk tends to follow just as quietly.

And when markets begin testing that line, the SNB has rarely stayed on the sidelines for long.