Wall Street enters the coming week facing a critical Federal Reserve policy decision as investors increasingly expect the central bank to raise interest rates for the first time in 2026. The potential move comes as the U.S. stock market remains supported by strong corporate earnings and artificial-intelligence investment, but rising Treasury yields are creating a more challenging environment for equity valuations.

Rate-Hike Expectations Move Above 80%

Fed funds futures indicated a more than 80% probability of a quarter-percentage-point rate increase at the Federal Reserve’s two-day meeting ending Wednesday, according to LSEG data. The expected move would place the policy rate at a range of 3.75% to 4.00%, after the central bank had kept rates unchanged throughout 2026.

Expectations strengthened following August inflation data, which showed the core Consumer Price Index, excluding food and energy, rising 0.3% for the month, hotter than anticipated. The latest employment report also showed stronger-than-expected monthly job gains, adding to the argument that the economy retains enough momentum to withstand tighter monetary conditions.

However, uncertainty remains. Market expectations have shifted repeatedly in recent weeks as investors assessed economic data and comments from Federal Reserve officials. The central question is increasingly whether policymakers will deliver one rate increase or signal that additional tightening could follow.

10-Year Treasury Yield Nears the 5% Threshold

The potential rate increase comes against a backdrop of significant pressure in the U.S. Treasury market. The benchmark 10-year yield reached 4.99% early Friday, its highest level in nearly three years, before ending the session around 4.97%.

Higher long-term yields can affect equities through several channels. They raise borrowing costs for households and companies while increasing the relative attractiveness of fixed-income securities. They can also place pressure on stock valuations by increasing the discount rate applied to future corporate cash flows.

The effect could be particularly important for smaller companies that rely more heavily on debt financing. At the same time, higher yields are partly reflecting stronger economic growth expectations, meaning the bond-market move does not necessarily signal deteriorating economic fundamentals.

Fed Credibility and the Risk of a New Tightening Cycle

The market’s focus will extend beyond the size of any rate move to the Federal Reserve’s guidance. Investors will be looking for evidence of whether a September increase is intended as a single adjustment or the beginning of a broader tightening cycle.

Chair Kevin Warsh is also facing scrutiny over the central bank’s inflation-fighting credibility. Inflation has remained above the Fed’s 2% annual target for years, while the latest core inflation reading and labor-market data suggest that price pressures may not disappear quickly.

The Fed’s communication will therefore have consequences beyond interest rates. Any indication that further increases are likely could push Treasury yields higher and increase pressure on equity markets. Conversely, a more measured approach could limit the immediate impact on stocks, although persistent inflation would leave the possibility of future tightening open.

Looking ahead, investors will closely monitor the Fed decision, updated economic projections, Treasury yields and Chair Warsh’s guidance. The S&P 500 remains nearly 12% higher for 2026 but is around 2% below its mid-August record, leaving the market more sensitive to changes in financial conditions. Whether strong earnings and AI investment can offset higher real yields will be central to the outlook, while renewed oil-price pressure and geopolitical tensions could further complicate the Fed’s inflation assessment.