Savers will have to choose between locking in a yield of around 2.5% now or waiting with more information.
After paying 2.409% on six-month and 2.523% on twelve-month Treasury bills at the July 7 auction, the Treasury will return to the market on July 14 with 3-month and 9-month bills. Summer no longer allows you to look only at the interest rate and buy.
The next date will be August 4, with 6-month and 12-month bills, and between the two auctions, the European Central Bank (ECB) will meet on July 23. The saver will have to choose between locking in a yield close to 2.5% or waiting with more information.
Although the yield may again be at those levels, that figure is not earned equally across all maturities because the interest on Treasury bills is always expressed in annual terms. A three-month bill does not yield that full percentage at maturity, but only the proportional part of the time elapsed.
An investment of €10,000 in three-month bills at a rate of 2.5% will not bring €250 in profit, but a quarter, barely €62.5 before taxes, because the capital only works for a quarter of the year. That time factor completely alters each household's investment strategy.
The maturity changes the decision
The three-month bill, with a return date set for October 9, 2026, stands out as the ideal alternative for those who need access to their liquidity after the holidays or prefer not to commit their savings until 2027.
This immediate availability, however, transfers to the saver the risk of being left exposed in the fall, a time when they will be forced to find a new destination for their money in a market that could offer much lower interest rates if central banks take their foot off the accelerator.
At that point, Nacho Zarza of Auriga Bonos points out that if inflationary pressures weaken and the market stops pricing in further ECB rate hikes, “the worst scenario would be having to roll over maturities at short terms.” Buying three-month bills gives freedom, but also forces you to return to the market sooner and accept the yield that exists then.
Looking at the nine-month tranche, the capital remains tied up until April 9, 2027. The wait compensates for the lack of immediate liquidity if the auction maintains a premium over shorter maturities, as happened in June when this maturity was around 2.51%.
[Image: facade of the Bank of Spain headquarters in Madrid in a file image.]
August allows waiting, but does not guarantee better rates
To access six-month and twelve-month maturities, you will have to wait until August 4. The six-month tranche will extend the investment calendar until February 2027, while the one-year bill will hold funds until next summer.
The nearest reference is the rates awarded on July 7. The Treasury then paid 2.409% on six-month and 2.523% on twelve-month bills, two levels that still serve as a showcase for conservative savings.
Waiting until August may make sense if market tensions keep yields high. It may also lose appeal if oil calms down, the ECB does not tighten its message, and debt begins to price in lower inflationary pressure.
In the opinion of Fortuna SFP, the main risk lies in long maturities and they prefer short durations, high-quality corporate debt, and inflation-linked instruments in a still-high rate environment. That idea does not invalidate nine-month or twelve-month bills, but it does require looking at the maturity more carefully in light of recent geopolitical alerts.
Oil puts pressure again
Just when the truce in Iran seemed sufficient to cool crude and ease yields, Donald Trump sowed doubts again by stating that the ceasefire in Iran was “over.” Brent rose more than 5% to the area of $78.
The response from sovereign debt was immediate, with the 10-year US bond near 4.6% and investors again focused on oil's impact on inflation. That tension does not automatically transfer to Spanish Treasury bills, but it does condition the price of money.
Leading investment firms like Amundi had already detected these warning signs, noting that the crude market “was pricing in a peace scenario that fixed income and the dollar were reluctant to validate.”
Federated Hermes also warns that inflation “remains difficult to predict” after the latest shocks in energy, tariffs, and labor markets. That uncertainty keeps central banks data-dependent and prevents savers from assuming that future auctions will pay more or less than current ones.
