Inflation is 3.4%. Inflation is also 2.4%. Both are correct.
The Federal Reserve watches one of these numbers and you pay the other. The gap between them in August was almost entirely the price of energy.
- What happened
- Consumer prices rose 3.4% over the twelve months to August 2026. Core prices — the same basket with food and energy removed — rose 2.4% over the same period.
- Why
- Energy prices are volatile and largely set outside the domestic economy. Stripping them out gives a cleaner read on whether inflation is embedded in wages and rents, which is what monetary policy can actually influence.
- The numbers that matter
- 3.4%Headline CPI2.4%Core CPI+16.3%Energy+27.4%Gasoline2.0%Fed's stated goal
- Why it matters
- Which number you look at changes whether you think inflation is nearly solved or a full percentage point above target.
- What happens nextas we saw it on 21 Sep 2026
- The September CPI report is scheduled by the Bureau of Labor Statistics.
Remove energy and inflation is close to target. Leave it in and it is a point above.
| Gasoline | 27.4% |
|---|---|
| Energy (all) | 16.3% |
| Headline CPI | 3.4% |
| Shelter | 3.0% |
| Food | 2.7% |
| Core CPI | 2.4% |
When someone tells you what inflation is, ask which one they mean. In August 2026 there were two defensible answers a full percentage point apart, and both came from the same page of the same government release.
Headline inflation — everything a household buys — rose 3.4% over twelve months. Core inflation, the same basket with food and energy taken out, rose 2.4%.
Where the difference lives
Energy prices rose 16.3% over the twelve months to August, and gasoline alone rose 27.4%. Shelter rose 3.0% and food 2.7% — both close to the headline, neither able to explain a one-point spread.
That is why the two measures separate. Take out the component running at sixteen percent and what remains runs at two and a half.
Why central banks look at core
Not because energy does not count. Because a central bank sets one interest rate for a whole economy, and interest rates do very little to the price of crude oil. What they can influence is the part of inflation that has worked its way into wages, rents and services — the part that persists after the shock passes.
Core is the better guide to where inflation settles once a shock unwinds. Headline is the better description of what a household actually paid. Treating either as the whole truth gets you a different answer to the same question.
What it meant for the September decision
The Federal Open Market Committee raised rates on September 16 and said in its statement that inflation "remains elevated". Core at 2.4% is not obviously elevated against a 2% goal. Headline at 3.4% is.
- Core at 2.4% says the underlying problem is nearly solved.
- Headline at 3.4% says households are still paying a full point above target.
- Households do not get to remove energy from their budgets, which is why headline is what gets felt.
Sources
- Consumer Price Index Summary — August 2026U.S. Bureau of Labor Statistics · Sep 11, 2026 · Primary source
- FOMC statement, September 16, 2026Federal Reserve Board · Sep 16, 2026 · Primary source
Related analysis
The Fed stopped arguing with itself, and raised rates
In July three officials wanted higher rates and lost. On September 16 the vote was 12–0. Nothing about the committee changed — the data did.
Oil at $107 is the reason your inflation number has not fallen
West Texas Intermediate was $107.02 a barrel on September 15. Gasoline is up 27.4% over twelve months, and that one component is the whole gap between headline and core inflation.
Pay rose 3.1% in the year to August. Prices rose 3.4%.
Average hourly earnings reached $37.75 in August. Measured against inflation over the same twelve months, the average worker went slightly backwards.