The October inflation report arrived on November 10 with a usable month-to-month reading and a conspicuous hole in a familiar comparison. The Consumer Price Index for All Urban Consumers (CPI-U) rose 0.4% from September on a seasonally adjusted basis. But for many series, the Bureau of Labor Statistics could not publish the usual change from October a year earlier: it had not collected October 2025 prices during a lapse in appropriations. The missing comparison is a data limitation, not evidence that prices were unchanged or that inflation disappeared.
The release date and the reference month answer different questions
BLS published its October 2026 CPI report on November 10. “October” describes when the prices in the report were measured; it is not the publication date. The headline CPI-U increased 0.4% from September, seasonally adjusted, after a 0.6% rise in September. Shelter rose 0.3%, food 0.5%, and energy 0.7%. The index excluding food and energy also advanced 0.3%, the same monthly increase recorded in August and September Bureau of Labor Statistics. These are comparisons between two adjacent months for which BLS has data.
A year-over-year change compares an index in October 2026 with the index in October 2025. BLS reported that survey data were not collected for that earlier month because of a lapse in appropriations, so October 2025 indexes were unavailable for most CPI series. As a result, the release leaves the 12-month change blank for indexes without that base value Bureau of Labor Statistics. It is a specific gap in the comparison, not a statement that the newer month has no measured prices.
A missing base month is not a zero
A percent change needs two values: the later index minus the earlier index, divided by the earlier index. If the October 2025 index was never produced, the ordinary October-to-October calculation cannot be completed. Substituting zero would be mathematically invalid; carrying forward September or estimating an October value would introduce a different method and an assumption. BLS’s release says the annual comparisons are unavailable where the October 2025 index is missing, rather than silently filling the gap Bureau of Labor Statistics.
That distinction is useful when reading a table or a headline that usually includes both monthly and annual inflation. “Unavailable” is not synonymous with “0%,” “stable,” or “unknown in every respect.” It means the particular official comparison lacks one of its required observations. The observed October-to-September comparison remains available, and the release publishes component detail for that month. Other indexes or areas may have different data availability, so the limitation should be stated for the affected series instead of generalized to every number in the report.
Why a monthly increase cannot simply stand in for a yearly rate
Multiplying 0.4% by 12 gives 4.8%; compounding the same monthly change for twelve months gives about 4.9%. Either is a hypothetical run rate, not the missing October-to-October observation. Both assume the latest pace repeats every month. Prices can speed up, slow down, or reverse; one monthly figure cannot show what happened over the previous year.
The two comparisons also use different seasonal treatments. BLS seasonally adjusts many month-to-month CPI changes to account for recurring seasonal patterns, while its standard 12-month changes are generally not seasonally adjusted Bureau of Labor Statistics. Even with a complete base month, those rates answer distinct questions: one compares the latest month with the preceding month after seasonal adjustment; the other compares price levels twelve months apart. An annualized monthly pace can be useful as a clearly labeled scenario, but it should not be presented as the missing annual statistic.
Pay data inherit the same comparison gap
BLS released October real-earnings figures on the same day. For all private nonfarm employees, real average hourly earnings were unchanged from September. That result combined a 0.4% increase in nominal average hourly earnings with the 0.4% rise in CPI-U Bureau of Labor Statistics. “Real” earnings adjust pay for consumer prices, so a flat monthly result says the average hourly wage measure kept pace with the month’s broad price index over that interval. It does not describe every worker’s raise, hours, or household budget.
The real-earnings release also says the usual over-the-year comparison is unavailable because October 2025 CPI data were not collected Bureau of Labor Statistics. That is a reminder that derived measures depend on their inputs: when the price comparison is missing, a real-pay comparison built on it may be missing too. The release does not replace the unavailable annual rate with a guessed number. Production and nonsupervisory employees are a separate group with separate results, so their figures should not be merged with the all-employee series.
A careful reading keeps the evidence and the gap together
For household budgets, the report documents a broad monthly rise and shows which components moved. CPI is an average for a defined population and basket, not an individual family’s personal inflation rate Bureau of Labor Statistics. A household with different spending can experience a different change; the 0.4% does not calculate its own increase. The unavailable annual comparison also does not mean prices returned to their year-ago level.
The sound takeaway is narrow: on November 10, BLS measured a 0.4% seasonally adjusted increase in CPI-U from September to October 2026, while it could not publish many standard October-to-October changes because the October 2025 comparison index was absent. That is enough to describe the latest month, but not enough to reconstruct the missing year-over-year result. Keeping the reference period, publication date, and unavailable comparison separate makes the report more informative without pretending the data say more than they do.
Sources & further reading
- Consumer Price Index, October 2026 ↗Bureau of Labor Statistics
- Real Earnings, October 2026 ↗Bureau of Labor Statistics
- Consumer Price Index Frequently Asked Questions ↗Bureau of Labor Statistics
