August CPI Preview: How Friday’s Inflation Print Could Move Stocks, Bonds, the Dollar and the Fed

August CPI Preview: How Friday’s Inflation Print Could Move Stocks, Bonds, the Dollar and the Fed

Why This CPI Report Matters More Than Usual

August CPI is the last major inflation print before the Fed votes. The Bureau of Labour Statistics publishes the August Consumer Price Index on Friday 11 September at 8:30 am ET. The FOMC then meets 15–16 September, with the rate decision, new forecasts and the dot plot due at 2:00 pm ET on Wednesday 16 September. That sequencing is why this print matters more than a routine mid-cycle CPI. It is the last consumer-inflation snapshot the Committee will have before it has to choose between another hold at 3.50–3.75% and the first hike since 2023.

What the July Report Showed

July CPI rose 0.1% on the month and 3.4% year-on-year.

What Economists Expect for August

Consensus for August is a firmer headline — around 0.4% month-on-month — with the annual rate little changed at 3.3–3.4%. Core CPI, excluding food and energy, is expected around 0.2% month-on-month and 2.3–2.4% year-on-year. The monthly headline bounce is widely expected to come from energy after gasoline prices turned higher, plus some lift in airfares and lodging. The debate that will move markets is not whether headline inflation “looks hot” for one month. It is whether core, shelter and services confirm that underlying pressure is still fading — or whether it is starting to re-accelerate.

How Markets Are Positioned Ahead of the Data

Futures have been leaning toward a 25 basis-point hike next week, with probabilities recently around two-thirds after this week’s producer-price data and a firm August jobs report. Economists remain more cautious: a Reuters poll still had a majority looking for a hold, even as the share expecting at least one hike this year has risen. The Committee itself is split. The July vote was 9–3 to hold, with three members already wanting tighter policy. Chair Kevin Warsh will also publish a new Summary of Economic Projections. The dots may matter as much as the decision.

What Traders Will Watch Beyond the Headline

Markets will not treat “in line” as a non-event. They will parse the composition: core goods versus core services, rents and owners’ equivalent rent, airfares, insurance, used cars, and anything that feeds the Fed’s preferred PCE gauge later this month. A 0.2% core print driven by shelter cooling is a different story from a 0.2% print driven by broadening services. Rounding will matter too. A core reading that prints 0.3% after rounding is far more likely to force a hawkish repricing than a 0.15–0.24% range that still looks like 0.2%.

Scenario 1: CPI Prints In Line With Forecasts

This is the base case most desks are writing to: headline up about 0.4% on energy, core around 0.2%, annual headline still near 3.4%, core easing a tenth or so toward the mid-2s.

Equities

Equities would probably see an initial relief bid if core does not surprise higher, especially in rate-sensitive growth and small caps that have been hostage to hike odds. That bounce may not last the day. An in-line print does not remove a September hike; it merely keeps the existing 60–70% probability live. Banks and energy could hold up better than long-duration tech if the market concludes the Fed still has room to lean against inflation without an emergency move.

Bonds

Bonds would likely rally modestly if core lands at 0.2% after the pre-CPI sell-off, particularly if shelter and supercore look contained. Front-end yields are the most sensitive because they embed the September decision. A 4–8 basis-point dip in two- and ten-year yields is a reasonable base-case reaction if there is no ugly detail in services.

US Dollar

The dollar should be mixed to slightly softer on an in-line core, especially against currencies that sold off on this week’s ECB hike and oil spike. Confirming, not exploding, inflation takes some of the urgency out of the dollar bid — unless the details look worse than the headline.

How the Fed May React Next Week

An in-line report leaves the Committee on a knife-edge. A hold is still on the table if officials want more evidence that energy is a one-off. A hike is also on the table if they treat the strong labour market plus sticky services as enough to start the insurance tightening some members already wanted in July. The cleanest in-line outcome is a 25bp hike with a statement that this is not the start of a long campaign — or a hold with dots that still show a hike later in 2026.

Scenario 2: A Hotter-Than-Expected CPI Print

Think core 0.3% month-on-month, headline clearly above 0.4%, or services and shelter re-accelerating even if the rounded core still looks “only” 0.2%.

Equities

Equities would be the first casualty. Higher discount rates hit long-duration growth hardest. A risk-off tape would likely rotate toward defensives, energy and quality balance sheets. Financials can be two-sided: higher rates help net interest margins, but a sharper growth scare and a stronger dollar would cap the bid.

Bonds

Bonds would sell. The front end would reprice the September hike as near-certain and lift the terminal rate. Ten-year yields would rise if inflation expectations stop falling. A hot print after a firm jobs report is the classic “no landing yet” combination: weaker duration, higher real yields, and less room for the Fed to look through energy.

US Dollar

The dollar would catch a clear bid. Rate differentials would widen, just as oil-related inflation fears already support the US relative to Europe and Asia. That dollar strength would feed back into equities via tighter financial conditions.

How the Fed May React Next Week

A 0.3% core makes a skip much harder to defend. The base case in that world is a 25bp hike to 3.75–4.00%, a higher median dot for end-2026, and a press conference that stresses price stability first. A 50bp move remains a tail risk, not the central case.

Scenario 3: A Softer-Than-Expected CPI Print

A 0.1% core, a downside miss on services, or clear cooling in shelter would be the surprise that most helps risk assets.

Equities

Equities should rally, led by duration-sensitive growth, housing-related names and the broader “Fed can wait” complex. Breadth would matter: a genuine disinflation print is more useful to the whole market than a one-off goods number that looks like used-car or tariff noise.

Bonds

Bonds would be the cleanest winners. Front-end yields would fall as September hike odds drop from around two-thirds toward a coin-flip or below. The curve could bull-steepen if the market also fades the chance of a late-2026 hike.

US Dollar

The dollar should soften, particularly if lower US yields coincide with still-firm oil and an ECB that has already hiked. A weaker dollar would support gold, international equities and some commodity FX.

How the Fed May React Next Week

The Fed would almost certainly hold at 3.50–3.75%. Officials could still keep a hike in the dots as insurance if they distrust one soft month. The risk in a soft print is not an immediate cut. It is a “hawkish hold”: unchanged rates, still-restrictive language, and a chair who refuses to declare inflation finished.

What the Fed Is Actually Weighing

This is not 2022. Policy is already well below the 2023 peak, inflation is no longer 5–9%, and the Committee has spent most of 2026 on hold. The live question is whether a new energy shock and a still-solid labour market require an insurance hike before inflation expectations drift. PCE at the end of September will be the better gauge of what the Fed targets, but CPI is what they get before they vote. That is why composition beats the headline.

What to Watch After the Number Hits

Into Wednesday, watch three things after the print:

1. Whether September hike odds move toward 80%+ or back toward 50%.
2. Whether the two-year yield and the dollar confirm that shift.
3. Whether equity leadership stays with quality and energy or rotates back into duration.

The data will not end the argument. It will decide how much of next week’s meeting is already done before the Committee sits down. This is a framework for how the tape usually behaves around a high-stakes CPI, not a prediction of Friday’s number and not investment advice.

By Anna Coulling – creator of volume price analysis

By Anna Coulling – creator of volume price analysis