September CPI Preview: Gasoline Lifts Headline to 3.6%

TL;DR: A Wall Street Journal survey of forecasters, as reported by investinglive, sees headline CPI up about 0.6% for September on surging energy. That would lift the annual rate to 3.6% from 3.4%. Core is seen cooling to about 0.2% on the month and holding at 2.4% on the year.

I spent years on a submarine signing off work packages, and the habit stuck: I don't trust a number until I know what it is and what it isn't. I'm writing this before the print, so everything below is expectation, not result. If the number lands differently, the figures change and the logic still holds.

What are forecasters expecting from September CPI?

They expect a hot headline and a calm core. The median across 14 forecasters points to a 0.6% monthly rise in headline CPI, up from 0.4% in August. Core, which strips out food and energy, is expected at 0.22%, slower than August's 0.29%.

The annual core figure is where the surveys split, and I'd flag it before anyone quotes a single number. The WSJ survey has core holding at 2.4%. Bloomberg's survey, as reported by the Hindustan Times, has it rising to 2.5%. A tenth of a point sounds like rounding, but it is exactly the margin the Fed will argue over.

Why is energy driving the headline?

Gasoline. According to the investinglive report, US pump prices averaged above $4.30 a gallon in September, a record for the month, as the war involving Iran keeps crude prices high. CNBC reports that Brent crude climbed more than 14% in September and about 42% across the third quarter.

Because everyone watching has seen those pump prices, the headline jump is mostly priced in. What the market can't see yet is whether the fuel bill is seeping into rents, freight and everything else. I'd rather be wrong about the headline than blind to that. A 3.6% built on gasoline tells you about oil.

Why does core matter more than the headline?

Core is where the Fed looks for proof that a shock is hardening into a trend. The forecasts sit in a narrow band, and that narrow band is the whole story.

Forecaster	Core CPI, month on month
Deutsche Bank	0.16%
Citigroup	0.18%
JPMorgan	0.18%
Goldman Sachs	0.24%
Barclays	0.24%
Morgan Stanley	0.24%

These figures come from the investinglive survey summary. Every one of them rounds to 0.2%, yet the soft and hard ends sit eight basis points apart. Per the same report, a print around 0.24% or higher would back Fed officials warning that inflation is broadening and would firm December hike pricing. A reading near 0.16% to 0.18% would support New York Fed President Williams' view that price pressures are shock-driven.

I'd also check for a distortion before trusting any core print. Fazen Markets reports that Barclays and Morgan Stanley noted an unusual jump in wireless phone service prices lifted August's core reading by around 0.1 percentage point and should partly unwind. If it does, core will look calmer than the underlying economy really is.

Where do Fed hike odds stand going in?

October looks settled. December doesn't. Per the Hindustan Times, September payrolls showed only 29,000 jobs added and a higher unemployment rate, and traders see a 76% chance the Fed holds in October. Investing.com puts the same October expectation from the other side, with hike odds at roughly 20%, down from around 70% before payrolls, and December at roughly 72%. One source counts holds and the other counts hikes, so they describe the same bet.

A soft core print could trim December. A hot one could pull October back into play, and the dollar and short-term yields would move with it.

What does this mean for an accredited investor's portfolio?

If you're newly accredited and weighing private deals against what you already hold, rate expectations reprice everything you're looking at. Downside first is how I read any private deal, and rates are part of the downside. A Treasury you can sell tomorrow sets the hurdle, and an illiquid investment has to pay you well above it for locking your money up.

So before you read a sponsor's projected return, ask what it pays above that Treasury, then ask what happens to the payout if rates stay high through next year. Private credit is the place I'd look hardest. We covered one stress case in Cliffwater CCLFX's 13.9% redemption requests, and the Core+ infrastructure guide shows how a defensive strategy frames its return. For the currency side of today's data, see our note on the dollar near its 18-month high with CPI in focus.

One CPI print is one data point, and I wouldn't rebuild a portfolio on it.

Common mistakes when reading a CPI release

The biggest one is reacting to the headline. If forecasters already expect 3.6%, hitting 3.6% moves nothing. People also treat a rounded core number as precise, and a 0.2% and a 0.24% are not the same print once the months compound. And they forget one-offs like the wireless price jump, which can flatter or distort a single month.

FAQ

When is the September CPI report released? The report is due Wednesday at 8:30 a.m. Eastern, which is 1230 GMT, per the investinglive preview. Check the Bureau of Labor Statistics release schedule for the exact date, because the press reports I read don't agree on it.

What is core CPI? Core CPI excludes food and energy prices, which can change quickly. Economists watch it for the underlying trend. Headline CPI includes everything, so a gasoline spike shows up there first.

Will the Fed raise rates in October? Per the Hindustan Times, traders see a 76% chance the Fed leaves rates unchanged at its October meeting. A hot core print is what could change that. December is the live question.

Why do forecasters disagree if they all say 0.2%? They round to the same figure but differ underneath. Deutsche Bank is at 0.16% and Goldman Sachs at 0.24%. That eight-basis-point gap can flip annual core between 2.4% and 2.5%.

What to do today

Write down the core month-on-month number before the release, then compare it with the 0.16% to 0.24% range above once it prints. If you'd like me to walk through what the print means for private deals each week, sign up for the free AIN briefing and I'll send it to you.

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