What is the Core CPI?

Core CPI is the CPI-U index for all items less food and energy, one of thousands of series BLS publishes from the same price collection as the all items CPI. BLS notes that some users follow it because food and energy prices are relatively volatile and they want the core or underlying rate of inflation.

BLS publishes this series as all items less food and energy, and says some users follow it because food and energy prices are relatively volatile and they want the core or underlying rate of inflation. BLS reports CPI data on both a not seasonally adjusted basis and a seasonally adjusted basis.

Production facts:

  • Publisher: U.S. Bureau of Labor Statistics
  • Frequency: Monthly
  • Typical release time: 8:30 a.m. ET with CPI
  • Primary metric: Core CPI MoM/YoY
  • Market sensitivity: Very High
  • Data type: Hard data
  • Economic indicator type: Lagging
  • Revision risk: Low

Key components to watch

The headline (Core CPI MoM/YoY) is the most widely quoted but rarely the most informative number. The components that follow reveal whether the headline result is broad-based or concentrated, improving or deteriorating, and consistent with prior trends.

  • Shelter
  • Commodities less food and energy commodities
  • Services less energy services
  • Medical care services
  • Transportation services
  • Apparel

For any release with multiple components, the investor's task is not to memorize every number but to identify which components are most relevant to the current investment thesis and track those with the most care.

How to read the headline: actual versus expected

Markets react to the gap between the published Core CPI MoM/YoY and the consensus forecast, not to the level alone. A stronger-than-expected or weaker-than-expected result is defined against that forecast, so check what was expected before reading the number.

The Core CPI carries low revision risk, so the figure published at release is the one to compare with the forecast and with the previous period.

Market impact by asset class

The Core CPI primarily affects the following markets: Stocks, Treasuries, Fed funds futures, USD, Gold.

Stronger than expected result: In an inflation-elevated, tightening environment, a stronger result typically pressures interest-rate-sensitive assets and can strengthen the dollar. In a growth-slowing environment, a stronger result can be equity-supportive if it reduces recession fears.

Weaker than expected result: In a growth-concern environment, a weaker result may reinforce concerns about economic deceleration. If the Fed is watching this specific indicator for policy calibration, a persistent pattern of below-consensus results may shift the rate path.

In-line result: In-line results typically produce muted market reactions unless there are significant component deviations from expectations. The market had already priced the consensus, so confirmation requires little repricing.

Revision risk and methodology notes

The Core CPI carries low revision risk. The CPI-U series, including this index, is final when issued, and BLS describes no routine revisions for late arriving data. BLS annually updates its seasonal factors, and seasonally adjusted indexes published earlier are subject to revision for up to 5 years after original release, so the seasonally adjusted monthly change for a past month can change.

Primary source: U.S. Bureau of Labor Statistics: Core CPI.

Publisher documents read for this page:

Common investor mistakes

  • Reacting to the headline without checking the components. The headline can diverge significantly from the underlying trend revealed by the components. A headline beat driven by a volatile component may not indicate the same strength as a broad-based improvement.
  • Ignoring revisions to prior periods. An initial strong number revised down in the following release tells a different story than a number that stands firm.
  • Not knowing what is consensus-priced. Reacting to a number without knowing what was already expected conflates information with noise. The market reaction is driven by the deviation from expectations, not by the level of the number.
  • Applying the same interpretation across different regimes. The same headline result has different implications depending on the Fed's current stance, the growth trend, and what is already priced into the yield curve and equity multiples.

Related releases

The Core CPI should be read alongside:

  • Consumer Price Index (CPI)
  • Producer Price Index (PPI)
  • Core PPI
  • Personal Consumption Expenditures Price Index (PCE)
  • Core PCE Price Index

Frequently asked questions

What is the Core CPI?

Core CPI is the CPI-U index for all items less food and energy, one of thousands of series BLS publishes from the same price collection as the all items CPI. BLS notes that some users follow it because food and energy prices are relatively volatile and they want the core or underlying rate of inflation. It is published monthly by U.S. Bureau of Labor Statistics.

When is the Core CPI released?

The Core CPI is released by U.S. Bureau of Labor Statistics on a monthly schedule: 8:30 a.m. ET with CPI. Exact dates are on the publisher's release calendar.

How does the Core CPI affect markets?

The Core CPI primarily affects Stocks, Treasuries, Fed funds futures, USD. Its typical market sensitivity is rated Very High. A result that comes in stronger than consensus expectations generally moves affected markets directionally, while a weaker result can have the opposite effect. The direction depends on the current macro regime and what is already priced into markets.

What is the revision risk for the Core CPI?

The Core CPI carries low revision risk. The CPI-U series, including this index, is final when issued, and BLS describes no routine revisions for late arriving data. BLS annually updates its seasonal factors, and seasonally adjusted indexes published earlier are subject to revision for up to 5 years after original release, so the seasonally adjusted monthly change for a past month can change.