CPI report: Could a hot reading derail the Fed's rate path?

Today's US CPI release carries considerable weight, particularly after Treasury yields came close to multi-decade peaks in recent days. The general expectation ahead of the data is that the headline inflation figure will appear quite unfavorable. However, the real question is whether this will have a significant impact on market sentiment.

Forecasts indicate a 0.6% monthly increase in headline inflation, pushing the annual rate to an estimated 3.6%. A substantial portion of this uptick is attributed to rising gasoline prices, which are tied to ongoing tensions in the Middle East. In contrast, core inflation is projected to rise by a more subdued 0.2% month-on-month, translating to a 2.5% annual increase.

The Federal Reserve could plausibly overlook a temporary jump in energy costs, and it's likely that policymakers will do just that when assessing this report. But if these price pressures begin to seep into other sectors of the economy, the situation could take on a different character entirely.

Consequently, attention should center on core prices today, along with components like shelter costs and services inflation. An unexpected movement there would indicate that underlying price pressures are more persistent than the Fed would prefer.

Turning to the bond market, its reaction might offer clues about how broader markets will respond to the inflation data.

If the headline number is elevated but the core reading stays relatively tame, Treasury yields might find some room to ease. Given that the market has already braced for an unattractive headline figure, as noted earlier, this scenario is conceivable.

In my view, it would require a significant upside surprise in core inflation to push yields sharply higher again. The short end of the curve is unlikely to see much movement unless traders start to believe that an inflation surprise warrants a fresh look at the Fed's outlook.

Could this bring an October rate hike back into consideration? It's possible, but that seems like a stretch. Fed funds futures indicate only about a 22% chance that traders expect another hike this month. That's a fairly low probability, particularly with higher borrowing costs already doing part of the Fed's work in tightening conditions.

Thus, it would likely take a genuine shock in core inflation to alter that perspective. Otherwise, December appears to be the more likely timing for the next rate increase, with traders already pricing in about 88% odds of a move then.

Keeping that in mind, we shouldn't be too surprised if the headline figure comes in poor but bonds decide to rally following the release. Even so, such a move would probably reflect traders grabbing some short-term relief after the pressure seen in recent weeks.

What's crucial today is not just how hot the inflation appears at a glance, but whether the underlying details give the Fed another reason to act sooner. That could be the focal point for market reactions to this week's inflation data.

On a broader scale, the overall narrative for the bond market and wider financial markets hasn't fundamentally shifted. The US-Iran conflict is still ongoing, keeping energy prices elevated. Fiscal issues remain prominent and won't disappear quickly. Additionally, inflation pressures are gradually spreading through the economy, preventing the Fed and other major central banks from becoming complacent.