Your Cost-of-Living Raise Follows the Cooler Inflation Number. The Fed Follows the Hotter One.

On August 26 the Commerce Department reported that prices rose 3.7 percent over the twelve months to July 2026.^[1]

Twelve days earlier, the Labor Department had reported that prices rose 3.4 percent over the same twelve months.^[2]

Neither number is wrong, and neither is a revision waiting to happen. They measure different baskets, bought by differently defined people, added up with different arithmetic. What is unusual about July is the order. For most of this century the Labor Department's number has been the larger of the two. In July it was the smaller one — and on the "core" readings that strip out food and energy, it was smaller by eight-tenths of a percentage point.

That gap is not a statistical curiosity. One of these numbers is being used right now to set the Social Security raise that lands in January. The other is the one the Federal Reserve is looking at while it decides whether your borrowing costs come down.

The two numbers

The Labor Department publishes the Consumer Price Index. It tracks what urban households pay out of pocket. Over the twelve months to July 2026, the all-items CPI rose 3.4 percent. Strip out food and energy and it rose 2.5 percent.^[2]

The Commerce Department publishes the PCE price index, short for personal consumption expenditures. Over the same twelve months it rose 3.7 percent, and 3.3 percent excluding food and energy.^[1]

The Federal Reserve's 2 percent goal is written on the PCE index, not on the CPI. That has been true informally since 2000 and formally since 2012.^[6] So the number in the headlines you read is almost never the number the Fed is acting on.

Why the order flipped

The Bureau of Labor Statistics has published its own account of why the two indexes diverge. It names three causes: scope, weight, and formula.^[3]

Scope is the one doing the work this month. The CPI counts only money that leaves your wallet. The PCE counts everything consumed on your behalf — including the share of your medical care paid by your employer's insurance plan, and by Medicare and Medicaid. Health care therefore carries a much heavier weight in the PCE index than in the CPI.^[4]

Housing runs the other way. Shelter is the single largest item in the CPI basket, and it carries a lighter weight in the PCE index.^[4]

Then look at what those two categories did. Shelter rose 3.2 percent over the twelve months to July — slower than the all-items CPI itself.^[2] Health-care prices did not slow to match. When the heaviest item in one index cools and the heaviest item in the other does not, the two indexes drift apart. This time they drifted far enough to cross.

The size of the crossing is what makes it worth your attention. Since 2000, annual CPI inflation has averaged 0.39 percentage points higher than PCE inflation.^[4] In July 2026 it came in 0.3 points *lower*. On the core measures, 0.8 points lower.

Which number follows your money

Your Social Security raise follows the CPI — a specific version of it. The cost-of-living adjustment is set under Section 215(i)(1) of the Social Security Act, which compares the third-quarter average of the Consumer Price Index for Urban Wage Earners and Clerical Workers, CPI-W, against the third-quarter average of the last year a raise was granted.^[7] The 2026 adjustment was 2.8 percent, computed from the third quarter of 2024 against the third quarter of 2025.^[8]

The window for the 2027 adjustment is open right now. It is July, August and September of 2026. July's CPI-W came in at an index level of 327.104, up 3.4 percent over the year.^[2] One of the three readings is on the record; the September figure, published in October, closes it.

If you are near retirement, that is the practical consequence of the flip: the raise is computed from the 3.4 percent index, not the 3.7 percent one you saw in the headlines this week.

The Fed's rate follows the PCE. On July 29 the Federal Open Market Committee held its target range at 3.50 to 3.75 percent and said inflation "remains elevated relative to the Committee's 2 percent goal." Three members — Beth Hammack, Neel Kashkari and Lorie Logan — dissented in favor of *raising* the range by a quarter point.^[5]

The index those officials are measuring against 2 percent is the 3.7 percent one. If you have been reading the cooler CPI number and expecting rate relief to follow, you have been watching the wrong gauge.

I Bonds and TIPS follow the CPI-U, the all-urban-consumers version, unadjusted. That is the 3.4 percent number.

Your own inflation rate follows neither. Both indexes describe an average household that does not exist.

What to do with this

Work out which basket your spending actually resembles, because the twelve-month components are far apart:

- Gasoline: +24.6 percent^[2]

- Airline fares: +25.5 percent^[2]

- Energy overall: +14.7 percent^[2]

- Shelter: +3.2 percent^[2]

- Food at home: +2.7 percent^[2]

- Used cars and trucks: −1.9 percent^[2]

If a large share of your money goes to fuel — a long commute, a trade you drive for — your personal rate is running well above both official numbers, and the cooling in shelter that pulled the CPI down did nothing for you. If you own your home outright and drive little, the opposite. If most of your health care is paid by an employer plan or by Medicare, the PCE index is the closer description of what is being consumed on your behalf — but most of that money is not coming out of your account, so it is not what squeezes your budget.

Three things follow from that, and the first two are mistakes made in opposite directions:

1. Do not forecast your COLA from a PCE headline. Different index, different agency, different answer.

2. Do not expect a Fed cut because the CPI cooled. The Committee is measuring the other index, and in July it did not cool.

3. Build your own number. Take your last three months of spending, weight the categories above by what you actually spent, and you will have a more useful figure than either agency publishes — and you will know which of the two official stories is closer to yours.

We covered a related disagreement — between two official measures of *wages* — in Two Government Numbers Disagree About Your Raise. Only One Is About You. The pattern is the same: two honest measurements, two different questions, and a public argument that is really about which question counts.

Figures as of August 27, 2026.

This article is educational and is not financial advice.