September 2026 Market Outlook: Earnings Strength Meets Inflation and Rate Risk

A solid foundation with less room for error

September begins with markets still supported by strong corporate earnings and resilient private-sector demand, but with a more complicated macro backdrop, according to MRA Advisory Group's investment committee. Inflation remains above the Federal Reserve's 2% target, long-term Treasury yields are elevated, and geopolitical tensions have pushed oil prices higher just as investors prepare for a critical month of employment, inflation, and Fed data.

Historically, September has been a difficult month for equities, but MRA cautioned that seasonality alone is not an investment strategy. The current market remains technically strong and corporate earnings are providing meaningful support. The larger question is whether inflation and interest rates will continue to challenge valuations in the weeks ahead.

Three drivers for the month

MRA expects September to be driven by three primary issues: the labor market, inflation, and the Federal Reserve. A combination of moderate employment growth and improving inflation would likely be favorable for both stocks and bonds. Conversely, stronger inflation or wage data could push Treasury yields higher and pressure valuation-sensitive areas of the equity market, particularly long-duration growth stocks.

The committee noted that the market enters September with a reasonably solid fundamental foundation but less room for disappointment. Earnings are strong, private-sector demand remains healthy, and layoffs remain low. At the same time, inflation remains elevated and long-term yields are increasingly competitive with equities, which raises the bar for positive surprises.

Inflation data and the energy wildcard

The Federal Reserve's preferred PCE price index increased 0.2% in July and 3.7% from one year earlier, according to Commerce Department data cited in the outlook. Core PCE, which excludes food and energy, also rose 0.2% during the month and remained 3.3% higher year over year—well above the Fed's 2% objective. That makes the trajectory of energy prices particularly important following renewed conflict involving Iran and the Strait of Hormuz.

Fed Chair Kevin Warsh's hawkish Jackson Hole remarks shifted market expectations toward a September rate hike, with fed funds futures pricing roughly 60–68% odds of a quarter-point increase. MRA's outlook emphasised that the interaction between sticky core inflation and an oil shock creates a policy dilemma: tightening to address price pressures risks amplifying the growth impact of higher energy costs.

Portfolio discipline in a volatile month

MRA's committee recommended maintaining disciplined portfolio construction rather than reacting to daily headline volatility. The firm noted that long-term Treasury yields near 4.75% offer meaningfully higher income than they did two years ago, which increases the opportunity cost of holding equities at elevated multiples. Diversification across asset classes and geographies remains the primary defence against a month likely to be dominated by macro data releases.

Key dates on the calendar include the August nonfarm payrolls report on September 5, the August CPI on September 10, and the FOMC decision on September 15–16. Each release has the potential to shift the balance between the earnings-supportive and inflation-constraining narratives that define the current market environment.