The Fed’s Impossible Equation in Autumn 2026

With five weeks until the November FOMC, Jerome Powell finds himself in a situation few central bankers have faced: inflation that lingers without truly re-accelerating, a labour market that holds without overheating, and a Congress that just passed the largest fiscal expansion since the Reagan era. The « Big Beautiful Bill, » signed by Donald Trump in June 2026, projects $5.3 trillion in tax cuts and $2 trillion in new spending over ten years, representing $3.3 trillion in additional deficit according to the CBO.

For the Fed, this fundamentally changes the rules of engagement. In a fiscally neutral environment, the central bank calibrates rates solely against inflation and employment. But when the government injects massively into the economy via deficit spending, any monetary easing risks amplifying the fiscal stimulus — and reigniting the very inflation the Fed has been fighting since 2022. This is the paradox Powell must address at the November 4-5 FOMC.

The August 2026 macroeconomic data paints a contrasted picture. Core PCE — the Fed’s preferred inflation gauge — holds at 2.8%, a full 80 basis points above target. Headline CPI at 3.1% partly reflects the persistence of Trump-Europe tariffs (autos, steel, semiconductors) and energy tensions linked to the Strait of Hormuz conflict. The unemployment rate at 4.2% evidences a still-solid labour market that provides no justification for emergency easing.

The « Big Beautiful Bill »: When Fiscal Policy Constrains Monetary Policy

The budget law signed in June 2026 represents a structural shock of unprecedented scale since the 2017 tax cuts — but far larger in magnitude. CBO estimates are unambiguous: over ten years, US federal debt will rise from 122% to 137% of GDP. This fiscal drift has a direct translation in bond markets: investors demand a higher term premium to finance the growing deficit.

This largely explains why the 10-year Treasury yield stands at 5.1% at end of September 2026, even as the Fed funds rate has been anchored at 5.25-5.50% for eighteen months. In a « normal » configuration, a 10-year yield only 40bp above the policy rate would signal imminent cuts. Here, the term premium — estimated at 1.2% by the NY Fed’s ACM model — keeps long rates elevated independently of monetary policy expectations.

For the Fed, this dynamic creates an additional dilemma. If it cuts rates while the deficit is widening, it risks signalling fiscal complacency — what Volcker’s Fed refused to do in the 1980s. But if it maintains restrictive rates too long, it risks triggering a credit accident in a corporate sector facing $900 billion in maturities due for refinancing in 2026-2027.

Three Scenarios for November 5th

Our probabilistic analysis identifies three trajectories for the Fed’s decision, with very different implications for portfolios. The probability distribution remains anchored around a hold, but the window for a November cut has opened slightly following more conciliatory minutes published in early October.

Central scenario (hold, 55%): The Fed maintains rates at 5.25-5.50% and signals cautiously that it will monitor data through December. Powell’s speech will emphasise that inflation has not yet been defeated and that expansionary fiscal policy warrants vigilance. This scenario is what bond markets are largely pricing, offering the best carry at short tenors for cash and short-duration bond allocations.

Dovish scenario (cut 25bp, 35%): If October NFPs (released November 3rd, just two days before the decision) disappoint — below 120,000 new jobs — and September core PCE confirms a deceleration toward 2.5%, the Fed may feel authorised to begin its easing cycle. This scenario would benefit intermediate-duration bonds (3-7 years) and growth equities that have underperformed for two years under the high-rate regime.

Hawkish surprise (hike 25bp, 10%): The least likely but most destabilising scenario. A new inflationary wave — oil spike from a Middle East escalation, or a tariff shock — could force the Fed to raise rates one final time. This scenario would trigger a violent sell-off in bonds and equities, but would send gold above $3,200/oz.

Portfolio Strategy: How to Position Before November 5th

In an environment of monetary uncertainty, portfolio construction favours resilience over maximum potential return. Our general recommendation remains a defensive-neutral cursor, with tactical adjustments as key catalysts materialise over the coming weeks.

Three Data Points to Watch Before the Decision

The Fed’s November 5th decision will be largely conditioned by three crucial macroeconomic publications in the five weeks preceding it. These represent the last pieces of information the FOMC will have available to calibrate its decision.