The simple version

Two government agencies publish two different inflation numbers, and right now they are telling slightly different stories. The Bureau of Economic Analysis says core inflation was 3.2% in March 2026, using its measure, the PCE Price Index. The Bureau of Labor Statistics says core inflation was 2.6% in March and 2.8% in April, using its measure, the Consumer Price Index. Both numbers are real. Both are correct. They measure different things.

This matters to your money in three concrete places. Your Social Security cost-of-living adjustment is indexed to CPI by law. The Federal Reserve targets PCE when it decides whether to cut interest rates, which moves your mortgage, your auto loan, and your credit card APR. And many private pension and union COLAs use one or the other. The 0.6 percentage point gap between core PCE and core CPI is not a rounding error. It is a different statistic.

The numbers

• Core PCE, March 2026 (released April 30, 2026): 3.2% year over year. Headline PCE: 3.5%. (BEA)
• Core CPI, March 2026 (released April 10, 2026): 2.6% year over year. Headline CPI: 3.3%. (BLS)
• Core CPI, April 2026 (released May 12, 2026): 2.8% year over year. Headline CPI: 3.8%. (BLS)
• Wedge between core PCE and core CPI for March 2026: 0.6 percentage points.
• Federal Reserve longer-run target: 2% PCE inflation, not CPI. (FOMC Statement on Longer-Run Goals)
• Next PCE release covering April 2026 data: May 28, 2026.

Why the two indexes disagree

CPI surveys urban households about a fixed basket of goods and services they buy directly. PCE uses a broader basket that includes spending done on your behalf, the largest piece of which is employer-paid health insurance. PCE also updates its weights more frequently as people change what they buy, while CPI updates its weights on a slower schedule.

The practical effect is simple. Housing carries a larger weight in CPI, roughly a third of the index. Medical care and other services carry a larger weight in PCE. When health care prices rise faster than rent, PCE shows more inflation than CPI. When rent rises faster than health care, the order flips. That is the entire story behind the wedge.

The Real Cost lens

Over a 30-year retirement, the choice of inflation measure compounds into real dollars. Take a starting Social Security benefit of $30,000 per year, indexed annually to CPI-W. Adjusted at an average 2.6% per year, in 30 years that benefit grows to roughly $64,800. Adjusted at 3.2%, the rate of core PCE, it would grow to roughly $77,300. That is about $12,500 of annual purchasing power difference at year 30, decided entirely by which index the law uses.

Social Security is locked to CPI-W. A household whose actual spending looks more like the PCE basket (more health care, less housing) feels prices rise faster than its cost-of-living raise. A household whose spending looks more like CPI feels the opposite. Neither household is wrong about its own budget. The index just does not match every wallet.

What this means

When a politician or commentator cites a single inflation number, ask which index they mean. A 2.6% claim and a 3.2% claim can both describe the same month accurately. The number tells you which agency, which basket, which weights. It does not tell you that the other side is wrong.

It also explains why rate cuts feel slow. The Fed targets 2% PCE inflation, and core PCE is currently 1.2 percentage points above that target. By CPI, inflation looks closer to the goal. The Fed is reading its own preferred number, and its own preferred number is the one further from 2%.

What this is NOT

This is not a prediction of what the Fed will do at its next meeting. This is not advice on when to claim Social Security, on retirement planning, or on any investment decision. This is not a buy or sell signal. This is not a political endorsement of either party's interpretation of the inflation data. Both indexes are produced by federal statistical agencies using published methodologies. Both are correct. They measure different things.

Sources

• U.S. Bureau of Economic Analysis, Personal Income and Outlays, March 2026 (released April 30, 2026): https://www.bea.gov/news/2026/personal-income-and-outlays-march-2026
• U.S. Bureau of Labor Statistics, Consumer Price Index Summary, April 2026 (released May 12, 2026): https://www.bls.gov/news.release/cpi.nr0.htm
• U.S. Bureau of Labor Statistics, Consumer Price Index, March 2026 (released April 10, 2026): https://www.bls.gov/news.release/archives/cpi_04102026.htm
• U.S. Bureau of Economic Analysis, PCE Price Index Excluding Food and Energy (methodology): https://www.bea.gov/data/personal-consumption-expenditures-price-index-excluding-food-and-energy
• Federal Reserve, Statement on Longer-Run Goals and Monetary Policy Strategy: https://www.federalreserve.gov/monetarypolicy/files/FOMC_LongerRunGoals.pdf
• Social Security Administration, Cost-of-Living Adjustment (uses CPI-W): https://www.ssa.gov/cola/