EUR/CHF: Analysis of the macroeconomic factors influencing the rate

The EUR/CHF currency pair is one of the most closely watched by European financial markets. Unlike purely speculative pairs, the rate of the Euro against the Swiss Franc is driven by a complex combination of economic fundamentals, divergent monetary policies, and market psychology.

The evolution of this rate is not a matter of chance, but the result of several tangible and measurable forces. Here is a detailed analysis of the main structural and cyclical factors that determine the value of the EUR/CHF, illustrated by the major historical events that have shaped this market.

1. How does the ECB-SNB rate gap weigh on EUR/CHF?

This is the most direct mechanical driver on the foreign exchange markets in the short and medium term, governed by the theory of Uncovered Interest Rate Parity (UIRP).

The mechanism: Global capital is constantly seeking the highest risk-adjusted yield. If the European Central Bank (ECB) maintains key interest rates significantly higher than those of the Swiss National Bank (SNB), holding capital in euros theoretically becomes more profitable than holding it in Swiss francs.

Where does the gap stand in September 2026? On 10 September 2026, the ECB raised its three key interest rates by 0.25 percentage points: deposit facility rate at 2.50%, with effect from 16 September. On 24 September 2026, the SNB kept its policy rate at 0%. The yield gap between the two currencies therefore stands at 2.50 percentage points, a differential which, according to this mechanism, supports the euro against the franc.

The mathematical relationship: The relationship between the spot exchange rate (Spot) and the forward exchange rate (Forward) is defined by the following equation:

To fully understand this equation:

• S (Spot): The current exchange rate on the market.
• F (Forward): The expected future exchange rate.
• r_eur: The key interest rate set by the European Central Bank (ECB).
• r_chf: The key interest rate set by the Swiss National Bank (SNB).

A high interest rate differential in favor of the Euro theoretically pushes the EUR/CHF upwards through the "Carry Trade" mechanism (borrowing in a low-interest-rate currency to invest in a high-yielding currency).

2. Why does the inflation gap push the franc up?

Over the long term, exchange rates tend to adjust to reflect inflation differences between two economic zones. This is the theory of Purchasing Power Parity (PPP).

The mechanism: Historically, Switzerland has a structurally lower inflation rate than the Eurozone (thanks to its energy mix, its strong agricultural protectionism, and the natural strength of its currency).

Consequence on the currency: According to the relative PPP formula, the percentage change in the exchange rate between two countries offsets the difference in their inflation rates:

To fully understand this equation:

• ΔS / S: Represents the percentage change in the exchange rate over time.
• π_eur (Pi): Corresponds to the inflation rate in the Eurozone.
• π_chf (Pi): Corresponds to the inflation rate in Switzerland.

Because Swiss inflation is chronically lower than European inflation, the Swiss franc must mathematically appreciate over the years so that real purchasing power remains balanced between the two zones. This is the fundamental bedrock of the long-term downward trend of the EUR/CHF over the last two decades. The gap is still there: in August 2026, annual inflation stood at 0.8% in Switzerland (FSO) against 3.2% in the euro area (Eurostat).

3. Why is the franc a safe haven?

The Swiss franc shares the global "Safe Haven" status with gold, the Japanese yen, and the US dollar. This status sometimes completely disconnects the EUR/CHF from its purely macroeconomic fundamentals.

• The mechanism: During periods of geopolitical stress, financial crises, or major economic uncertainty, institutional investors liquidate their risky assets (equities, emerging market currencies) to buy security and risk-free yield.
• Correlation with volatility: The CHF rate is historically correlated with the VIX (the stock market fear index). When fear rises, capital flows into Switzerland (renowned for its political stability, neutrality, and extremely sound public finances), causing a sudden and massive appreciation of the CHF against the Euro.

4. How does the SNB intervene in the foreign exchange market?

Unlike the ECB or the Fed, which let their currency float, the SNB is an active and openly declared player in the foreign exchange market. Article 99 of the Federal Constitution entrusts it with a monetary policy that serves the overall interests of the country, and Article 5 paragraph 1 of the National Bank Act (NBA) specifies that it ensures price stability while taking due account of economic developments. In its press release of 24 September 2026, it still says it is "willing to be active in the foreign exchange market as necessary to ensure appropriate monetary conditions".

As the Swiss economy is heavily export-oriented (pharmaceuticals, watchmaking, machinery), a "too strong" franc makes Swiss products too expensive abroad and penalizes domestic industry. The SNB then intervenes by creating Swiss francs to massively buy foreign currencies (primarily the Euro) in order to artificially weaken its own currency and protect its exporters.

5. What is the effect of eurozone sovereign risk?

The Euro is a currency shared by several sovereign countries with very different fiscal risk profiles. The health of the EUR/CHF pair is therefore intimately linked to the market's perception of the risk of a breakup of the Eurozone or a European public debt crisis.

Currency traders closely monitor bond "spreads": that is, the yield difference demanded by investors between the bonds of states considered risky (e.g., Italian BTPs, French OATs) and safe havens (the German Bund). If this risk premium explodes, confidence in the viability of the Euro crumbles, leading to an immediate flight of capital towards the neighboring Swiss franc.

6. Why does the Swiss current account support the franc?

The exchange rate is, beyond pure finance and speculation, the reflection of commercial supply and demand.

Switzerland posts a massive structural surplus in its current account balance. To buy high-value-added Swiss products, the rest of the world must sell their currencies to buy Swiss francs. At the same time, large Swiss multinationals (Nestlé, Roche, Novartis) repatriate a portion of their huge profits made abroad in CHF to pay their local taxes and distribute dividends.

This uninterrupted flow of trade creates a constant and mechanical buying pressure for the Swiss franc. This is one of the fundamental reasons explaining why, beyond crises, the EUR/CHF has experienced an almost uninterrupted downward trend since the creation of the single European currency in 1999: the first ECB reference rate, on 4 January 1999, stood at 1.6168 CHF; the lowest point of the series was reached on 9 March 2026 at 0.9008 CHF, and the rate stood at 0.9461 CHF on 29 September 2026 (ECB, EUR/CHF reference rate).

7. Summary and key figures

The EUR/CHF exchange rate is never driven by a single variable; it is a permanent dynamic equilibrium, whose movements you can watch as they happen on our CHF/EUR rate page:

• During periods of macroeconomic calm, it is the interest rate differentials (the mechanics of the Carry Trade) and the surplus of the Swiss trade balance that dictate the underlying trend of the market.
• Over the very long term, the inflation differential (Purchasing Power Parity) justifies the slow but steady appreciation of the Swiss currency against the Euro.
• Finally, during exogenous shocks (wars, surprise elections, pandemics), risk aversion and the safe-haven status violently regain the upper hand, with rapid, erratic movements, under the constant observation of an SNB ready to intervene to smooth out market excesses.

8. Frequently asked questions

What makes EUR/CHF rise or fall?

Six main forces: the interest rate gap between the ECB and the SNB, the inflation gap between the euro area and Switzerland, the franc's safe-haven status, SNB interventions, eurozone sovereign risk and the Swiss current account surplus. In the short term, rates and crises dominate; over several decades, lower inflation in Switzerland explains the pair's underlying decline.

What is the interest rate gap between the ECB and the SNB in September 2026?

It is 2.50 percentage points. The ECB raised its deposit facility rate to 2.50% with effect from 16 September 2026, while the SNB kept its policy rate at 0% on 24 September 2026. According to interest rate parity, such a gap makes the euro more rewarding than the franc and tends to support EUR/CHF, as long as markets remain calm.

Why does the Swiss franc appreciate against the euro over the long term?

Because Swiss inflation is durably lower than euro-area inflation. According to purchasing power parity, the exchange rate offsets this gap so that purchasing power remains balanced. In August 2026, annual inflation was 0.8% in Switzerland against 3.2% in the euro area. The ECB reference rate went from 1.6168 CHF in January 1999 to 0.9461 CHF at the end of September 2026.

What was the "Frankenschock" of 15 January 2015?

It was the SNB's sudden discontinuation of the minimum exchange rate of 1.20 CHF for 1 EUR, introduced on 6 September 2011. On the same day, it lowered its interest rate to -0.75%. The ECB reference rate went from 1.2010 CHF the day before to 1.0280 CHF, before falling to 0.9816 CHF on 23 January 2015, a drop of more than 18% in seven sessions.

Can the SNB still intervene in the foreign exchange market?

Yes. In its press release of 24 September 2026, the SNB says it is willing to be active in the foreign exchange market as necessary to ensure appropriate monetary conditions. Its mandate derives from Article 99 of the Federal Constitution and from the National Bank Act, whose Article 5 requires it to ensure price stability while taking due account of economic developments.