GBPUSD Traders Focus on Reaction Functions Ahead of Fed and BoE Decisions

The September meeting of the Federal Reserve (Fed) and the Bank of England (BoE) will be closely watched by traders, as both central banks make their interest rate decisions a day apart. Despite being in similar policy territory, the Fed's decision on 16 September and the BoE's on 17 September are expected to have different implications for the GBPUSD currency pair.

The traditional yield gap that usually drives the pair is becoming less decisive as both banks operate in similar territory. When the differential narrows, traders focus on the story behind their rates rather than their level. This means that the market will be looking at the reaction functions of both banks, which are the rules linking what they see to what they do.

The Fed is watching whether inflation is cooling broadly or only at the headline level. A softer CPI print driven mainly by energy markets can be read differently from a sustained easing in core services, which remains one of the cleaner signals of domestic price pressure. The September meeting also carries a fresh Summary of Economic Projections, so the dot plot and real-yield path may matter as much as the rate decision itself.

The UK side presents a different story, with inflation having eased from earlier pressure but services inflation and wage growth remaining central to the BoE's decision-making. The labor market has shown signs of loosening, yet domestic inflation pressure hasn't fully followed. A hold with a hawkish minority is very different from a unanimous hold.