Three central banks, three constraints,
one consequence.

The narrative that dominated fixed income strategy in the first quarter of 2026 was global easing synchronisation. The Federal Reserve was cutting, the European Central Bank was cutting, and the Bank of England was cutting. The narrative implied a directional tailwind for global duration that would benefit all yield curves in the same direction. This narrative was wrong in a specific way: it correctly identified the direction of policy change but incorrectly assumed that the speed, magnitude, and inflation constraint for each bank were comparable. They are not comparable, and the divergence in constraints is the source of the most important cross-currency and cross-duration trades available in the current cycle.

The three central banks face three fundamentally different constraint sets. The Federal Reserve's constraint is the term premium reset: rates cannot fall as far or as fast as the market prices because the fiscal supply of Treasury duration creates a floor for long-end yields that is independent of the policy rate path. The ECB's constraint is the political fragmentation premium in peripheral spreads: the ECB cannot ease as aggressively as the German growth slowdown warrants because aggressive easing would reduce the OAT-Bund spread and be characterised as implicit fiscal support for France. The Bank of England's constraint is services CPI stickiness: the BoE cannot cut as many times as the OIS strip prices because the services basket is absorbing wage pressure at a rate that has not decelerated to the level required for confident easing.

These three constraints are simultaneously active and interact with each other in ways that create cross-currency positioning opportunities that are systematically underexploited by portfolios that treat the global easing cycle as a single directional theme. The desk's framework analyses each constraint separately, identifies the implied relative duration and FX positioning, and then constructs a cross-asset allocation that benefits from the divergence rather than assuming convergence.

The Federal Reserve is cutting the short end of the yield curve. The market has priced approximately 75 basis points of additional easing over the next 12 months, concentrated in the 3-month to 2-year segment. This front-end easing is real and will likely be delivered, subject to the services inflation constraint described in the tariff pass-through note. The analytical error that the bulk of global duration positioning is making is to assume that the front-end easing will pull the long end lower proportionately.

It will not, for the reason that the desk has analysed in detail in the term premium note: the fiscal supply of long-duration Treasury paper is structurally elevated, and the private sector must absorb approximately USD 2.5 to 2.8 trillion of net new Treasury duration per year. When the Fed cuts the front end, the 2-year yield falls in line with the rate expectations repricing. But the 10-year and 30-year yields are increasingly determined by the term premium, which is driven by fiscal supply, inflation uncertainty and foreign demand rather than by the policy rate path. The result is a yield curve steepening: the front end falls while the long end remains elevated or rises slightly as the fiscal supply component maintains its pressure.

The yield curve steepening trade is therefore the primary expression of the Fed constraint. The desk is positioned for a 2/10 steepener, receiving the 2-year SOFR rate and paying the 10-year swap rate, as the primary expression of the divergence between front-end easing and long-end term premium persistence. The current 2/10 spread of approximately negative 15 basis points is priced too flat relative to the desk's estimate of the equilibrium spread under the current fiscal and policy regime, which is positive 40 to 60 basis points. The steepening has a 12 to 18 month timeline and is driven by the asymmetric constraint: the front end falls on Fed cuts, the long end holds or rises on term premium persistence.

The ECB's easing cycle is the most institutionally complex of the three, because the ECB's mandate requires it to maintain price stability across the eurozone while its balance sheet management must simultaneously manage the risk that sovereign spread widening in France or other peripheral-to-core issuers creates a fragmentation of the monetary transmission mechanism. These two objectives are in tension in the current environment.

The price stability mandate, applied to Germany and the Northern European core, would justify a faster easing pace than the ECB is currently delivering, because German industrial production is contracting, the Mittelstand is in a slow recession (as the desk has documented separately), and German headline inflation is tracking close to or below the 2% target. A purely German-calibrated ECB policy rate would be approximately 50 to 75 basis points below the current deposit rate.

The fragmentation management objective, applied to France and the Southern European periphery, creates the opposite pressure. If the ECB eases aggressively, OAT paper becomes more expensive relative to Bunds because the easing reduces the overall yield level and compresses spreads in the near term. But this spread compression is politically problematic if it is perceived as the ECB reducing the market discipline on French fiscal policy. The ECB's TPI was designed to separate these two objectives: the ECB can ease for price stability reasons and activate TPI to prevent disorderly spread widening as a separate, sterilised tool. In practice, the political economy of TPI activation is more complex than the mechanical framework suggests, because TPI requires conditionality that is equivalent to fiscal monitoring, which the ECB prefers to keep in the hands of the European Commission rather than assuming itself.

The result of this constraint set is that the ECB eases more slowly than the German data justifies, which is a negative for German sovereign bonds in relative terms (they underperform what pure rate-expectations would imply), and which keeps the EUR slightly more supported than a pure carry model would predict. The investable expression of the ECB constraint is a Bund 2/10 steepener that is less steep than the US equivalent, because the ECB's fragmentation constraint prevents it from cutting the front end as aggressively as the Fed cuts its equivalent.

The cross-currency implication is the most directly investable. If the ECB is constrained from cutting as aggressively as the market prices, EUR short-dated rates will be higher than an unconstrained ECB would deliver. This makes EUR short-dated rates more attractive relative to USD short-dated rates than the absolute rate level comparison suggests. The desk's preferred expression is long EUR 2-year swap rate versus short USD 2-year swap rate, a position that benefits from the ECB cutting less than expected and the Fed cutting more than expected, which is the desk's central forecast for the differential.

The Bank of England's constraint is the most mechanically precise of the three: there is a specific inflation variable, services CPI at approximately 5.5%, that must decelerate to a specific level, approximately 4.5% on a sustainable basis, before the BoE can deliver the cut sequence that the OIS strip has priced. The constraint is not a philosophical debate about whether easing is appropriate. It is a numerical threshold that the data must cross before the Committee can justify acting.

The desk's full analysis of services CPI stickiness is presented in the dedicated BoE optionality note. The relevant observation for the three-central-bank framework is that the BoE's constraint is more data-dependent and faster-moving than either the Fed's term premium constraint or the ECB's fragmentation constraint. The term premium constraint evolves on a fiscal and structural timeline measured in quarters to years. The fragmentation constraint evolves on a political timeline measured in election cycles. The services CPI constraint could resolve in a single quarter if wage growth decelerates faster than expected.

This shorter constraint horizon makes sterling the most tactically tradeable of the three currencies in the current cycle. A single services CPI print that comes in at 4.8% or below would trigger an immediate GBP repricing as the market recalibrates its BoE easing expectations from the current 50 basis points priced for 2026 toward 75 to 100 basis points. Conversely, a print at 5.7% or above would trigger the mirror repricing in the opposite direction. The desk therefore maintains active sterling positions with explicit data triggers rather than holding a structural pound view that requires a multi-quarter conviction.

The interaction between the three constraints creates a specific cross-currency implication that the desk terms the convergence paradox. All three central banks are in easing mode, but the constraints ensure that the timing and magnitude of their easing diverges. The ECB eases more slowly than Germany warrants, producing EUR short-end rates that are too high relative to fundamentals. The Fed eases more at the front end than the long end benefits from, producing a steepening yield curve. The BoE eases in bursts conditional on data, producing volatile sterling and intermittent Gilt rallies. The consequence for a fixed income investor who buys duration across all three markets uniformly is that they are taking three different risk exposures while only managing one, the directional rate view, leaving the constraint-specific risks unhedged.

The one consequence that the desk identifies from the interaction of these three constraints is the superiority of cross-market positioning over directional duration positioning in the current global easing cycle. A portfolio that buys duration in all three markets because the direction of rates is lower is not well-positioned. A portfolio that expresses the rate direction through relative value trades that exploit the constraint differentials is better positioned because it captures the directional move while hedging the constraint-specific risks.

The desk's cross-market positioning framework produces three primary expressions. The first is the US 2/10 steepener, which captures the front-end easing while hedging the long-end term premium constraint. The second is long EUR 2-year rate versus short USD 2-year rate, which captures the ECB's relative constraint tightness versus the Fed's relative easing aggressiveness. The third is long GBP versus EUR on a 3-month horizon, conditional on the next services CPI print, which captures the BoE's faster constraint resolution relative to the ECB's slower political constraint.

Together, these three expressions form a cross-market portfolio that is net duration-neutral (the steepener is long front-end duration and short long-end duration in aggregate) while being directionally exposed to the constraint divergence. The portfolio benefits most from the scenario in which the Fed cuts, the ECB holds, and the BoE cuts faster than expected after a services CPI surprise: a scenario the desk assigns 28% probability.