NEW YORK, Sept 11 – Wall Street is heading into next week’s Federal Reserve meeting with an unusual degree of uncertainty, as investors increasingly expect the central bank to raise interest rates despite having kept borrowing costs unchanged throughout 2026.
A quarter-point increase on Wednesday would mark a significant shift for financial markets, particularly after months of debate over whether inflation remains persistent enough to justify tighter monetary policy. The decision could also test the credibility of new Fed Chair Kevin Warsh, whose recent comments have been widely interpreted by investors as a warning that policymakers remain prepared to act against inflation.
Markets have become more cautious as Treasury yields have climbed and the benchmark 10-year yield approaches the closely watched 5% threshold. Higher yields can make bonds more attractive relative to stocks while increasing financing costs for companies and consumers.
The uncertainty comes at a delicate moment for U.S. equities. The S&P 500 remains close to record territory and is up nearly 12% for the year, supported in large part by strong corporate earnings and continued investment in artificial intelligence infrastructure. But the index has recently pulled back from its mid-August peak, while rising borrowing costs and renewed geopolitical tensions are adding pressure to an already nervous market.
The latest inflation figures have strengthened expectations that the Fed could act. The U.S. Consumer Price Index showed consumer prices accelerated in August, while the core CPI measure, which excludes food and energy, increased 0.3% from the previous month, above economists’ expectations.
“The weight is now on a hike in September,” said Alicia Levine, chief investment officer at BNY Wealth.
Stocks Face a More Difficult Backdrop as Bond Yields Rise
The prospect of higher interest rates presents a challenge for stocks because it can affect markets through several channels at the same time.
For businesses, higher rates can increase the cost of borrowing money for expansion, investment and day-to-day operations. For consumers, more expensive credit can weigh on spending, particularly in areas such as housing, automobiles and other purchases that depend heavily on financing.
Higher Treasury yields can also change how investors value stocks. When government bonds offer higher returns, some investors may demand greater potential returns from equities before taking on the additional risk associated with shares.
That dynamic is particularly important for companies whose valuations depend heavily on expectations of strong growth in the future. A sustained rise in interest rates can reduce the present value investors place on those future earnings.
The S&P 500 entered the September meeting period with a strong gain for the year, helped by solid corporate earnings and heavy spending on AI-related infrastructure. Still, the index was about 2% below its mid-August record as of Friday.
The bond market has become one of the clearest warning signs for investors. The 10-year Treasury yield briefly reached 4.99% on Friday morning, its highest level in almost three years, before ending the session around 4.97%.
A move through 5% could attract even greater attention because it would represent a psychologically important level for financial markets. It could also increase pressure on parts of the stock market that are particularly sensitive to financing costs.
Smaller companies may be vulnerable because many rely more heavily on debt financing than larger corporations. Rising yields can make refinancing more expensive and potentially reduce the amount businesses are willing to spend on expansion.
At the same time, investors are dealing with another major source of uncertainty. Tensions between the United States and Iran pushed oil prices above $100 a barrel earlier in the week, raising concerns that a prolonged energy shock could add to inflationary pressure.
Stocks nevertheless ended higher on Friday as oil prices retreated, offering some relief ahead of the Fed meeting.
“We’re at a period where there’s a lot of uncertainty,” said Cayla Seder, a macro multi-asset strategist at State Street. “You have rising yields, and you have rising expectations of hikes.”
Inflation and Jobs Data Shift Expectations Toward a Rate Increase
Financial markets have repeatedly changed their expectations for the September meeting as new economic information has emerged.
Following Friday’s inflation report, Fed funds futures indicated more than an 80% probability that policymakers would raise the federal funds rate by 25 basis points, according to LSEG data. The central bank’s target range currently stands at 3.5% to 3.75%.
Those expectations had moved considerably in recent weeks as traders assessed employment figures, inflation readings and comments from Fed officials.
The latest employment report provided another reason for investors to consider a rate increase. U.S. employers added more jobs than expected in August, while the unemployment rate remained at 4.1%.
Inflation also remains well above the Fed’s 2% annual objective. The core Personal Consumption Expenditures price index, a closely watched measure because of its importance to Fed policymakers, was running at an annual rate of 3.3% in the latest reading.
That combination presents the central bank with a difficult policy decision. Economic growth and employment remain strong enough to withstand tighter policy, while inflation has not returned to the level officials have targeted.
“We know inflation is above target, we know that unemployment is low,” Seder said.
The question for investors is therefore not simply whether the Fed raises rates next week. Markets also want to know what policymakers believe should happen afterward.
A single quarter-point increase could be interpreted as a limited response to stubborn inflation. But if Warsh and other officials indicate that additional increases may be necessary, investors could quickly reassess stock valuations, bond yields and expectations for economic growth.
“If it signals a cycle, like, hey, we still have work to do, I don’t think it’s going to be great for the market,” Levine said.
That possibility is particularly important because some investors believe the market could react positively if the Fed leaves rates unchanged. Such a rally, however, might prove short-lived if inflation remains elevated and policymakers continue to signal that another increase is possible later.
Fed Decision Could Test Warsh’s Credibility and Market Confidence
Wednesday’s meeting will also be closely watched for what it says about the direction of the Federal Reserve under Warsh.
His speech last month was interpreted by many investors as hawkish, helping fuel expectations that the central bank could return to rate increases after keeping policy unchanged through 2026. The meeting therefore represents an opportunity for the Fed to clarify how seriously it views the recent persistence of inflation.
Investors are also watching the broader question of confidence in the central bank’s independence and policy credibility.
“The market remains concerned a bit with respect to Fed independence,” said JP Coviello, head of portfolio strategy at Citi Wealth.
That concern could make the tone of Wednesday’s announcement nearly as important as the actual rate decision. Investors will examine the Fed’s economic projections, Warsh’s remarks and any indications about the likely path of rates in the months ahead.
A hike accompanied by a firm inflation-focused message could push Treasury yields higher and place additional pressure on stocks. Conversely, a more cautious message could reassure equity investors, although it could also leave markets questioning whether the Fed is prepared to respond strongly enough to persistent inflation.
The bond market will remain central to that debate. The rise in Treasury yields has not been driven solely by expectations for monetary policy. Citi’s Coviello said the increase has reflected stronger expectations for economic growth, which could be viewed as a positive sign for corporate profits.
For now, that strength in earnings is helping support equities despite higher real yields.
“Given the rate of change in earnings growth that we’re seeing at the corporate level, in our view, that outweighs the rise in real yields from an equity investment perspective,” Coviello said.
That balance could determine whether Wall Street manages to absorb a rate increase without a major disruption.
Investors will enter Wednesday’s decision watching three closely connected signals: whether the Fed raises rates, whether officials suggest further increases are coming and whether Treasury yields continue moving toward or beyond 5%.
With inflation still above target, employment relatively strong and geopolitical risks pushing energy prices higher, the Fed faces pressure to demonstrate that its policy remains focused on price stability. For Wall Street, however, the challenge is determining how much of that tightening has already been reflected in asset prices and how much further adjustment could still be ahead.