Inflation Picks Up as Rates Fall: Cetes Lose Some of Their Shine at the Start of Spring

With inflation back above Banxico’s target, the real return on Cetes is narrowing—forcing investors to rethink maturities and expectations.

The combination of inflation accelerating again and a downward cycle in yields on Treasury Certificates (Cetes) is shrinking the “cushion” these instruments have offered savers in Mexico. In the third week of April, Cetes rates extended their downward trend, at a time when the National Consumer Price Index remains under pressure and above the range consistent with the central bank’s price-stability target.

In the latest available reading, headline inflation came in at 4.59% year over year in March, driven by sensitive components—such as energy and certain food items—and amid global volatility. This rebound makes the real-return calculation more important: the gain left after subtracting price increases. If nominal yields fall while inflation rises, the margin to preserve purchasing power shrinks.

At the most recent auction, 28-day Cetes held at 6.6%, while the 91-day tenor slipped to 6.7%. Meanwhile, 182-day Cetes came in at 6.98% and one-year instruments at 7.16%, both down from the prior issuance. While these levels remain above annual inflation, the spread has been narrowing, changing the trade-off between yield, investment horizon, and investor patience.

In practice, estimating the real return helps put the appeal in perspective: if a 28-day Cete pays 6.6% and annual inflation is around 4.59%, the gap is close to 2 percentage points. That “extra” is what offsets the loss of purchasing power; when inflation heats up or the rate falls, real returns tend to compress.

The downward adjustment in rates is happening in a context where the market expects the cost of money to move more cautiously. On one hand, Mexico has made progress in disinflation compared with prior years’ peaks; on the other, energy shocks, food pressures, and external uncertainty—including episodes of geopolitical tension—make a sustained decline in prices harder. That typically translates into more conservative expectations and greater sensitivity to each inflation print.

What’s behind the real-return “squeeze”

Cetes’ nominal yield is influenced by the monetary policy of the Bank of Mexico and by market expectations for inflation and growth. When investors believe Banxico may keep a restrictive stance for longer, rates tend to hold up; but if they see room for future cuts, short- and medium-term yields can fall before any formal moves occur. At the same time, if inflation rebounds—due to energy, food, or a more volatile exchange rate—the real return deteriorates even if the nominal rate is still “high” in absolute terms. In that scenario, savers face a dilemma: choose shorter maturities to reinvest quickly if rates move, or lock in higher rates for longer terms at the cost of less flexibility.

For retail investors, Cetes’ appeal also depends on what they’re compared with: versus traditional accounts with low yields, they remain a competitive option with relatively contained risk. Still, their edge no longer looks as wide as it did when inflation was falling more clearly or when rates were at their peak. In addition, the inflation households feel often concentrates in food and transportation—categories that can move more than the average—raising the bar for the real return people experience in day-to-day life.

Looking ahead to the next few months, these instruments’ performance will hinge on two key variables: the inflation path and Banxico’s tone. If inflation cools again, even slightly lower rates could still deliver acceptable real returns; if, instead, a rebound takes hold due to supply shocks or energy pressure, the market may demand a larger premium and rates could stabilize or even move back up.

Either way, the episode sends a clear signal: Cetes remain a useful savings and investment tool, but in a less tame inflation environment the focus is no longer just “the rate,” but the real return and a maturity strategy that protects purchasing power.

In sum, falling yields and higher inflation are tightening the margin of real gains in Cetes; their attractiveness will depend on price dynamics and Banxico’s decisions, as well as each investor’s liquidity needs.