French OAT-i and Eurozone Linkers
French OAT-i and Eurozone Linkers
French OAT-i and other Eurozone inflation-linked bonds track the Harmonized Index of Consumer Prices (HICP ex-tobacco), offering inflation protection within an environment of persistent real-yield suppression by ECB policy.
Key takeaways
- OAT-i (French inflation-linked bonds) and Eurozone linkers track HICP ex-tobacco, a European Union measure that often runs below both CPI and RPI
- Real yields on Eurozone linkers have been persistently negative (−1% to −2% annually) due to ECB quantitative easing and low inflation targets
- The Eurozone inflation-linked market is smaller and less liquid than TIPS or UK gilts, making large positions harder to build without moving prices
- HICP ex-tobacco excludes tobacco taxes, creating divergence from consumer price inflation on tobacco products
- French OAT-i are primarily held by European institutional investors; US-based investors face currency risk that often exceeds the real yield benefit
HICP ex-tobacco: the Eurozone inflation measure
The Harmonized Index of Consumer Prices (HICP) is calculated by the European Union statistical agency (Eurostat) for all member states. It is similar to CPI in that it tracks the cost of a representative basket of consumer goods and services, but it is structured to allow cross-country comparisons within the Eurozone.
HICP ex-tobacco removes tobacco and tobacco products from the index to focus on underlying inflation that reflects demand and supply in goods and services markets, excluding the extreme taxation on tobacco. This exclusion means HICP ex-tobacco often runs 0.2–0.4% lower than the all-items HICP, depending on tobacco tax changes.
The result is a Eurozone inflation measure that runs lower than both US CPI and UK RPI. In 2023, when Eurozone HICP ex-tobacco inflation peaked near 9%, US CPI peaked above 9%, but UK RPI exceeded 11% due to the housing cost component. This lower inflation measure has political and economic implications: Eurozone linker investors receive inflation adjustments based on a narrower index, and ECB policy is calibrated to a 2% HICP target.
The OAT-i bond structure
France issues OAT-i (Obligations Assimilables du Trésor Indexées) as long-term inflation-linked government bonds, similar to how the US issues TIPS and the UK issues index-linked gilts. OAT-i are issued via auction by the French Treasury (Agence France Trésor), typically in 10-year, 15-year, and 30-year maturities.
The coupon is paid annually (unlike TIPS and gilts which pay semi-annually), and the coupon is calculated on the inflation-adjusted principal. Like TIPS, the principal adjustment uses a lag period—typically four months—to incorporate published HICP ex-tobacco data. The French Treasury publishes the inflation ratio (current HICP ex-tobacco divided by the reference HICP ex-tobacco at issuance) monthly, and investors can track the adjusted principal daily.
At maturity, the principal is adjusted to reflect cumulative HICP ex-tobacco inflation over the holding period, with a minimum of par (the deflation floor). An investor holding an OAT-i to maturity receives the expected real return embedded in the coupon, adjusted upward or downward based on whether HICP ex-tobacco inflation exceeds or undershoots expectations.
Secondary market and liquidity constraints
The French OAT-i secondary market is active but narrower than the TIPS market. Major French banks (Société Générale, BNP Paribas, Crédit Agricole) make markets in OAT-i, and institutional investors (pension funds, insurance companies, asset managers) trade them regularly. However, a large investor seeking to build a multi-billion-euro position in OAT-i might encounter significant bid-ask spreads, especially for less-recently-issued series.
The liquidity constraint matters for retail investors accessing OAT-i through brokers or ETFs. A small ETF holding OAT-i might face challenges if it attempts to scale to billions of assets under management without moving prices materially. This is one reason global inflation-linked bond ETFs tend to be heavily weighted toward TIPS, with smaller allocations to European linkers.
Real yields on OAT-i in early 2024 hovered near −1%, meaning investors accepted losing 1% annually in real terms. This negative real yield reflects ECB policy and pension-fund demand, similar to the UK gilt market but even more pronounced. The ECB's commitment to 2% HICP inflation and its quantitative easing programs have suppressed real yields across most Eurozone fixed-income markets, and inflation-linked bonds are no exception.
Other Eurozone linkers
Beyond French OAT-i, several other Eurozone governments issue inflation-linked bonds:
German inflation-linked bonds (Bundesanleihen mit Inflationsschutz) are issued in smaller volumes than OAT-i and trade less actively. German government debt is less focused on long-term issuance, and inflation protection is a less pressing concern for German savers than for French or Spanish counterparts.
Spanish linkers (Bonos Indexados Españoles) are issued by the Spanish Treasury but trade in even narrower markets than German linkers. Spanish government creditworthiness has improved since the 2010s debt crisis, but the volume of Spanish linkers in circulation remains small.
Italian linkers are limited; Italy has not heavily pursued inflation-linked bond issuance as a funding strategy.
The fragmentation of Eurozone inflation-linked markets means that diversification across countries is difficult without encountering severe liquidity constraints. Most Eurozone institutional investors hold OAT-i as the primary liquidity source for inflation-linked exposure within the Eurozone, creating a de facto concentration in French bonds.
Real yields and the breakeven inflation rate
The Eurozone inflation breakeven rate is calculated as the difference between nominal German Bund yields and German Bundesanleihen (inflation-linked) real yields. In early 2024, a 10-year Bund yielded 2.3% while a 10-year Bundesanleihe yielded approximately −0.9% real, implying a breakeven inflation rate of 3.2%.
This implied inflation expectation of 3.2% contrasts sharply with the ECB's 2% target. The market is pricing an inflation premium above target, but the negative real yields reflect the ECB's policy framework and the scarcity of safe assets in the Eurozone. Investors needing to hold substantial fixed-income allocations in euros face a choice between negative real yields (on linkers) or low nominal yields (on nominal bonds)—both offer poor returns by historical standards.
For investors in the US or UK, allocating to Eurozone linkers requires converting the euro value to home currency. An investor buying a −1% real-yield OAT-i must expect the euro to strengthen against the dollar (or pound) to generate positive total returns. If the euro weakens, the currency loss compounds the negative real yield. The after-currency-cost return on Eurozone linkers for non-euro-based investors is often deeply negative.
ECB policy and the future of Eurozone linkers
The ECB's inflation targets and quantitative easing programs have profound effects on Eurozone linker valuations. When the ECB signals a commitment to holding rates near zero (as it did from 2015 to 2021), real yields on all bonds—including linkers—compress to negative levels. When the ECB begins raising rates (as in 2022–2023), real yields eventually recover, making linkers more attractive.
The ECB's primary concern is keeping HICP inflation near 2% and financial stability. Inflation-linked bonds with negative real yields are a symptom of ECB policy success (keeping inflation expectations anchored below actual inflation) or policy tightness (rates not yet high enough to generate positive real yields). Either way, Eurozone linker investors are dependent on ECB policy shifts to improve returns.
Looking forward, if ECB rates remain elevated and inflation stays near 2%, real yields on OAT-i could drift toward 0% to 0.5%—more attractive than the −1% seen in recent years but still unappealing by historical standards. The structural demand from European pension funds and insurance companies likely supports continued low real yields, as these institutions need inflation-linked assets regardless of the yield level.
Allocation to Eurozone linkers
For a US or UK-based investor, Eurozone linkers (OAT-i, Bundesanleihen, etc.) play a small role in a diversified inflation-linked bond allocation. The currency risk, negative real yields, and liquidity constraints suggest limiting exposure to a small tactical position.
A global inflation-linked bond allocation might look like: 60% TIPS, 30% UK index-linked gilts, 10% Eurozone linkers (by value). This reflects the liquidity, yield, and diversification available in each market. Within the Eurozone portion, most investors gravitate toward OAT-i due to liquidity, with smaller positions in German or Spanish linkers for diversification.
Institutional investors with eurozone liabilities (paying employees or beneficiaries in euros, for instance) may hold OAT-i or other Eurozone linkers as natural hedges regardless of yield. Retail investors without explicit euro liabilities are better served by TIPS or UK gilts unless they expect euro appreciation sufficient to offset the negative real yields and currency costs.
Next
Deflation, though rare, shapes the design of all inflation-linked bonds. The deflation floor protection—guaranteeing that principal never falls below par at maturity—is a critical feature that distinguishes these bonds from nominal bonds. Understanding when and why deflation protection matters clarifies when inflation-linked bonds are indispensable hedges versus optional allocations.