Keywords: August CPI, gasoline inflation, core CPI, October Fed hike, TIPS, non-housing services inflation

Key Highlights

  • The Bureau of Labor Statistics said the Consumer Price Index rose 0.4 percent in August and 3.4 percent from a year earlier, with gasoline up 3.9 percent on the month and accounting for over one third of the increase.
  • Core CPI rose 0.3 percent and 2.4 percent annually, but non-housing services jumped about 0.6 percent, the strongest since January.
  • Inflation-protected Debt is back in focus, with the iShares TIPS Bond ETF (NYSEARCA:TIP) a common instrument for expressing views on energy-led price pressure.
  • The Fed hiked to 3.75 percent to 4.00 percent on September 16, and CME FedWatch put October hike odds at 72.5 percent as of September 28.

Energy Did the Heavy Lifting, Services Did the Damage

The August report, released September 11, was loud for a simple reason. Energy prices rose 2.1 percent on the month and 16.3 percent over the year, while gasoline climbed 3.9 percent and is up 27.4 percent from August 2025. That pressure has not eased since: Brent Crude jumped about 4.1 percent to USD 108.59 a barrel on September 28 after President Trump rejected Iran's offer to reopen the Strait of Hormuz. The more uncomfortable detail for policymakers sat beneath the headline. Non-housing services rose about 0.6 percent as airfares gained 2.7 percent, hotels 2.4 percent and wireless services 5.9 percent. Airfares and hotels are categories where fuel and wage costs can pass through quickly, suggesting the energy shock is leaking into the broader price structure. Shelter rose a contained 0.3 percent and 3.0 percent over the year, and food rose just 0.1 percent.

Why Core at 2.4 Percent Is Not Reassuring the Fed

On paper, a 2.4 percent annual core rate looks close to the Fed's 2 percent target. Officials are reading the composition, not the level. The August report pushed hike odds to about 90 percent before the September 16 meeting, where the Federal Open Market Committee raised rates by 25 basis points in a unanimous 12-0 vote, its first increase since July 2023. Chair Kevin Warsh said Inflation is too high and has been for too long. The Summary of Economic Projections showed 12 of 18 policymakers expecting one more hike this year and pushed the expected return to 2 percent inflation out to 2029 from 2028. The Fed's preferred gauge adds tension: July core PCE ran at 3.3 percent year over year, and forecasts call for a 0.3 percent August rise when the Bureau of Economic Analysis reports on September 30.

How Markets Are Positioning Around Inflation Risk

The iShares TIPS Bond ETF (NYSEARCA:TIP) holds Treasury Inflation-Protected Securities, whose principal adjusts with CPI, making it a natural reference point when energy-driven inflation surprises. Inflation protection is not rate protection, though. The 10-year Treasury Yield climbed to about 5.21 percent on September 28, its highest since mid-2007, and rising yields weigh on duration-heavy funds such as the iShares 20+ Year Treasury Bond ETF (NASDAQ:TLT). Consumers are feeling the shift as well: University of Michigan year-ahead inflation expectations jumped to 4.6 percent in September from 4.0 percent. Equities have largely absorbed the shock, with the S&P 500 at 7,683.69 on September 28, almost unchanged from its August 31 close despite a 0.77 percent drop that day.

Where Things Stand

Not automatically, but it has made an October hike the base case. Gasoline inflation alone does not set policy, yet paired with 0.6 percent non-housing services inflation and 4.6 percent year-ahead consumer expectations, it has lifted CME FedWatch odds of an October 28 hike to 72.5 percent. For holders of the iShares TIPS Bond ETF (NYSEARCA:TIP), the question is whether inflation accrual keeps outrunning the duration drag of 5 percent yields. August PCE on September 30, payrolls on October 2 and September CPI on October 14 will shape the next step.