Will the rate of core CPI inflation be above 3.1% for the year ending in December 2026?

- [2026-10-14] BLS September CPI: core (all items less food and energy) rose 0.3% m/m (same as August) and 2.6% y/y, up from 2.4% in August. Headline was 0.6% m/m and 3.7% y/y. Gasoline rose 9.1% in the month, and energy is up 20.4% y/y. https://www.bls.gov/news.release/cpi.htm - [2026-10-14] Core beat the consensus of 2.5% y/y and 0.2% m/m. A strategist cited core running at a 3.7% annualized pace in September. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-14] Core services were up 3.1% y/y, shelter 3.2% and core goods 0.7%. Airline fares were up 22.4% y/y. (Component figures come from secondary sources.) https://www.portfolio-terminal.com/blog/cpi-inflation-september-2026 - [2026-10-15] Cleveland Fed nowcast: October core CPI is 0.21% m/m and 2.48% y/y. Q4 2026 core CPI is 3.02% annualized, with headline Q4 at 4.79%. Reaching more than 3.1% y/y in December would need core to run well above the nowcast. https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting - [2026-09-16] The Fed's September SEP puts 2026 core PCE at a median 3.4% (June: 3.3%) and headline PCE at 3.7%. The Fed hiked 25bp to 3.75–4.00% and most members expect another hike this year. Core PCE is a different measure from core CPI. https://www.schwab.com/learn/story/fomc-meeting - [2026-10-14] Markets price better than a 96% chance of a Fed hike by the end of the year. The next FOMC decision is Oct 28. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html and https://www.kiplinger.com/investing/economy/cpi-report-september-2026-what-to-expect - [2026-10-14] Kiplinger quotes one economist (Payne) forecasting year-end 2026 core CPI at 2.7% and headline at 4%. That is a single forecast, not a consensus. https://www.kiplinger.com/investing/economy/cpi-report-september-2026-what-to-expect - [2026-05 survey] The Philadelphia Fed Q2 SPF expected Q4/Q4 2026 core CPI of 2.9% and headline of 3.5%. This is older and a different basis (Q4/Q4, not Dec/Dec). https://www.philadelphiafed.org/surveys-and-data/real-time-data-research/spf-q2-2026 - [2026-10-14] Context: the Iran conflict has pushed up energy prices, with Brent up about 42% in Q3. Commentators say second-round effects are starting to show in core. Bank of America earlier expected these effects to stay contained. https://www.roic.ai/news/hot-us-inflation-report-delivers-upside-surprise-on-core-prices-10-14-2026 - [Schedule, as of 2026-10] Remaining CPI releases: October CPI on Nov 10, November CPI on Dec 10, and December CPI (the resolving print) on Jan 13, 2027 at 8:30 ET. That is the same day trading closes. https://www.bls.gov/schedule/news_release/current_year.asp and https://www.usinflationcalculator.com/inflation/consumer-price-index-release-schedule/ - [Background] The late-2025 shutdown meant no October 2025 CPI was published, and a shutdown also delayed the January 2026 report. This distorts some base effects, and the rules extend the expiration if another shutdown disrupts data. https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting and https://thriveinmarkets.com/calendar/indicator/cpi/ BOTTOM LINE: Core CPI was 2.6% y/y in September, so a December print above 3.1% (3.2% or higher) needs a rise of at least 0.6pp in three months. The Cleveland Fed nowcast implies roughly 2.5–2.8% instead. Upside risk comes from energy pass-through and hot recent core prints. NOT FOUND: the exact unrounded core index levels, the December 2025 base-month index, and the consensus for the October and November core prints. I also found no official BLS statement of a shutdown risk for Q4 2026.

- [2026-10-14] BLS reported September core CPI at 2.6% year over year (0.3% m/m), up from 2.4% in August. That was 0.1 point above the 2.5% consensus. Core is 0.5 points below the 3.1% threshold, so December would need about 0.5 points more of acceleration. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-14] Headline CPI was 3.7% in September, driven by gasoline (+9.1% m/m) in an Iran-war energy shock. Shelter rose 0.4% and used cars 0.7%, so some of the pressure was broad. A Carson Group strategist put core at a 3.7% annualized pace for September. Core 12-month readings earlier in 2026 ran about 2.5–2.7%. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-15] The Cleveland Fed nowcast for October 2026 has core CPI at 0.21% m/m and 2.48% y/y. Its Q4 core CPI annualized nowcast is 3.02%. The nowcast is a model with weak core skill; it had September core at 2.39% against an actual 2.6%. https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting - [2026-01-13] December 2025 core CPI was 2.6% y/y. The 2025 comparison base is distorted: the shutdown left October 2025 CPI unpublished and depressed November 2025 goods and rents. That base effect could lift y/y core in the Oct–Dec 2026 prints. https://www.cnbc.com/2026/01/13/cpi-inflation-report-december-2026.html - [2026-10-12] Kalshi traders put only a 6% chance on core CPI falling below 2.2% this year. They expect core to stay elevated through the rest of 2026. https://www.cnbc.com/2026/10/12/inflation-will-remain-sticky-in-2026-according-to-prediction-markets.html - [2026-10-12] A Kalshi-based summary puts median late-2026 core CPI expectations around 2.7%, with headline near 3.6%. This is a secondary source. A 2.7% median is well below 3.1%. https://cryptobriefing.com/kalshi-traders-inflation-peaked-2026-sticky/ - [2026-10-14] Kiplinger's economist expects year-end core CPI of 2.7% (headline 4%). https://finance.yahoo.com/economy/policy/articles/september-cpi-report-inflation-data-153418947.html - [2026 Q2 survey, about 2026-05] The Philadelphia Fed SPF median for 2026 Q4/Q4 core CPI was 2.9%, up from 2.6% in the prior survey. This is a Q4/Q4 measure, not Dec/Dec, and it predates the September data. https://www.philadelphiafed.org/surveys-and-data/real-time-data-research/spf-q2-2026 - [2026-08-?] J.P. Morgan said its baseline, with the Strait of Hormuz reopening and oil near $100, could push global core inflation "well above 3%". This is a global scenario, not a US Dec 2026 point forecast. https://www.jpmorgan.com/insights/global-research/economy/global-inflation-forecast - [2026-10-15] Fed funds futures price a 91% chance of at least one hike by December. Estimates for September core PCE are about 3.1% y/y (Cleveland Fed nowcast 3.05%). Core PCE runs above 3% while core CPI is near 2.6%, which is an unusual gap. https://cnbc.com/2026/10/15/pce-ppi-september-fed-reserve-rate-hike.html - Base rate: a core y/y reading typically moves 0.0–0.2 points per month, and a 0.5-point rise over three prints (Oct, Nov, Dec) is uncommon. It would need roughly 0.4% m/m core prints plus base effects. The Fed FEDS paper found Kalshi core CPI forecast errors about equal to the Bloomberg consensus. (Fed paper, 2026: https://www.federalreserve.gov/econres/feds/files/2026010pap.pdf) - [2026-10-15] The Atlanta Fed dashboard shows core CPI at 3.0% y/y in Sep 2025 and 2.6% in Sep 2026. Trimmed-mean CPI is 2.7% and median CPI 2.6%. https://www.atlantafed.org/research/inflationproject/underlying-inflation-dashboard BOTTOM LINE: Core is at 2.6% with consensus and market medians for year-end around 2.5–2.9%. A reading above 3.1% (3.2% or higher) would need about a 0.6-point rise in three months. That is a tail outcome, made less remote by energy pass-through, tariffs, shutdown base effects and a recent 0.3% m/m trend. NOT FOUND: the live Kalshi strike probabilities for core CPI above 3.1% in December 2026. A published economist consensus for December 2026 core CPI y/y after the September print. The exact 2025 Oct–Dec core index levels for base-effect arithmetic.

YES means: The BLS December 2026 CPI release (due 2027-01-13) shows all-items-less-food-and-energy up 3.2% or more over the 12 months to December 2026. A reported 3.1% or lower resolves NO. - [2026-10-16] **Exact threshold in index points.** BLS series CUUR0000SA0L1E (not seasonally adjusted core) was 330.506 in Dec 2025 and 339.287 in Sep 2026. A reported 3.2% needs an unrounded rate of at least 3.15%, which means a Dec 2026 index of about 340.92 or more. That is a rise of about 0.48% from September. https://api.bls.gov/publicAPI/v2/timeseries/data/CUUR0000SA0L1E?startyear=2025&endyear=2026 - [2026-10-16] **The 2025 base is soft, so the gap is smaller than "2.6% to 3.2%" suggests.** Unadjusted core fell from 330.804 in Sep 2025 to 330.506 in Dec 2025. That is a 0.09% decline, and the seasonally adjusted series rose only 0.42% (330.418 to 331.814). The shutdown-era base is mechanically weak. https://api.bls.gov/publicAPI/v2/timeseries/data/CUSR0000SA0L1E?startyear=2024&endyear=2026 - [2026-10-16] **Seasonal gap, and the required monthly pace.** The Q4 gap between seasonally adjusted and unadjusted core was about 0.51 points in both 2024 and 2025. In 2024, SA rose 0.79% and NSA rose 0.28%. The Dec 2025 NSA/SA ratio was 0.9961. Applying that to Dec 2026 requires the SA index to reach about 342.27, from 338.896 in September. That is roughly +1.0% over Oct–Dec, or about 0.33% m/m for three months. https://api.bls.gov/publicAPI/v2/timeseries/data/CUSR0000SA0L1E?startyear=2024&endyear=2026 - [2026-10-16] **Single most likely path to YES:** core prints about 0.33% m/m in each of Oct, Nov and Dec. September's unrounded core was 0.335% and August's was about 0.29%. YES is therefore roughly "Q4 repeats September", not a 0.6pp acceleration in underlying inflation. Prerequisites are that energy pass-through continues, tariff and AI-hardware goods keep rising, and shelter and airfares stay firm. My own arithmetic puts the Cleveland Fed's 0.21% October pace at roughly 2.8% for December, so the nowcast sits about 0.35pp below the threshold. https://www.bls.gov/news.release/cpi.htm - [2026-10-14] **Momentum is broad, not just fuel.** Unrounded Sept core was +0.33% (4.1% annualised) and core services +0.37%. Supercore services (ex-housing) ran at a 3.7% annualised pace. Core goods rose 0.25%, the largest monthly gain since Jan 2025, and the y/y rate turned up to 0.71%. Owners' equivalent rent rose 0.35% (4.3% annualised). Wolf Richter's read is that core goods had been rising "at a sharp clip" for three months. https://wolfstreet.com/2026/10/14/inflation-spreads-across-the-economy-not-going-back-into-the-bottle-cpi-core-cpi-core-services-cpi-spike/ - [2026-10-14] **Core beat on a pricing-mechanism basis.** Another desk had core at +0.335% against 0.21% expected. RBC noted toys and other imported recreation goods posted their largest-ever monthly changes, combining tariffs and transport costs. Economists also cite diesel costs and the AI boom as pressures still to come through. https://www.cnbc.com/2026/10/14/cpi-inflation-breakdown-september-2026.html - [2026-10-14] **Core inflation is firming, with lags still ahead.** The Sep release showed core 0.3% m/m for the second month. The BLS table gives Mar–Sep core m/m of 0.2, 0.4, 0.2, 0.0, 0.2, 0.3 and 0.3, so the June 0.0 was a one-off dip. Airline fares are +22.4% y/y (+1.2% m/m on jet fuel). Fuel oil is +15.3% m/m. Both are inputs to transport and services costs that can lag. https://www.bls.gov/news.release/cpi.htm - [2026-10-12] **Kalshi's sibling market is closer to the threshold than the consensus.** For core CPI y/y in Nov 2026, the Kalshi event page showed "above 2.8%" at 51% and "above 2.9%" at 22%. The snapshot was undated and likely predates the Sep print. This is a sibling contract, not this one. A Nov median near 2.8% with a hot Sep print makes December above 3.1% a tail that is not negligible. https://kalshi.com/category/economics - [2026-10-14] **Policy backdrop supports demand-side persistence.** Futures price better than a 96% chance of another hike this year, including near 50-50 odds of a 50bp move by December. Fed officials are treating the core uptrend as real. A strategist said the Sep core CPI "leaves intact the upward trend" over six months. https://www.kiplinger.com/investing/economy/cpi-report-september-2026-what-to-expect - [2026-10-16] **Wage and energy cross-check.** Core PCE is running above 3% while core CPI is near 2.6%, and the SEP median for 2026 core PCE is 3.4%. If CPI converges toward the PCE trend, core CPI has room to catch up. CPI-specific weights, such as shelter at about 3.2% y/y, limit that catch-up. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-09-25] **Shutdown risk is an extra YES-adjacent tail only through timing.** The rules extend expiry if a shutdown disrupts data. October 2025 CPI was never published (shown as "-" in the BLS database). Any distortion in the Oct–Nov 2026 collection would add noise to the base and the prints. I found no evidence of a Q4 2026 shutdown. https://blog.acrebase.com/posts/2026-09-25-cpi-rent-escalation-missing-october-2025-index/ BOTTOM LINE: The YES case is arithmetic. A soft Q4 2025 base means core needs only about 0.33% SA per month for Oct–Dec, which matches September's pace, to print 3.2% or higher. It does not need a 0.6pp underlying acceleration. The case still requires sustained hot prints against a 0.21% October nowcast and 2.5–2.8% economist and market medians. NOT FOUND: A published economist consensus for Oct, Nov or Dec 2026 core CPI m/m. Live prices for the Dec 2026 core CPI >3.1% strike. Any official BLS note on Q4 2026 seasonal-factor changes. Any confirmed Q4 2026 shutdown risk.

YES means: the BLS all-items-less-food-and-energy CPI 12-month change for December 2026 (released Jan 13, 2027) is published at 3.2% or higher. A reading of exactly 3.1% resolves NO. - [2026-10-14] Threshold arithmetic. The unrounded September core 12-month rate was about 2.56%. The unrounded rates were 3.74% headline and 2.56% core. The rounded December figure must reach 3.2%, so the unrounded rate needs to be at least about 3.15%. That is a rise of about 0.6pp in three prints. Nothing so far this year has moved core 12-month by that much in three months. (Threshold arithmetic is my calculation.) https://www.portfolio-terminal.com/blog/cpi-inflation-september-2026 - [2026-10-14] The September core m/m was a hot print by only a small margin. Unrounded core was 0.335% against a 0.21% forecast. Even that "hot" pace gives only about 1.0% cumulative over Oct–Dec. Reaching ≥3.15% needs roughly 0.33–0.35% a month for all three months, with no cooling. That depends on my estimate of the Oct–Dec 2025 base, about 0.4–0.45% cumulative. I infer that from 12-month core falling from 3.0% in Sept 2025 to 2.6% in Dec 2025 (see the BLS shutdown FAQ and KPMG items below). I could not confirm the index levels. https://piedmontcrescentcapital.com/september-cpi-2026-gasoline-moves-the-headline-services-move-the-trend/ - [2026-10-14] The 3-month pace is an outlier against longer trends. Core compounded at 3.41% annualized over 3 months, but 2.85% over 6 months and 2.57% over 12 months. It was only 1.97% annualized as of August. The 3-month pace swings widely and has mean-reverted before. Piedmont's one-sided HP-filter trend is 2.61%. Cleveland median CPI is 2.61% and trimmed mean 2.67%. Underlying measures sit at 2.2–2.7%, below 3.1%. https://piedmontcrescentcapital.com/september-cpi-2026-gasoline-moves-the-headline-services-move-the-trend/ - [2026-10-14] Part of September's strength was in volatile lines. Lodging away from home rose 2.0% after 2.4% in August, and the source says it explains part of the shelter acceleration. Airline fares slowed to 1.2% from 2.2% in July and 2.7% in August. OER rose 0.3% and rent 0.2%, which are not hot. A mean-reverting lodging line can drop out. https://piedmontcrescentcapital.com/september-cpi-2026-gasoline-moves-the-headline-services-move-the-trend/ - [2026-10-14] BLS primary data confirms the composition. Core rose 0.3% in September, as in August. OER rose 0.3 percent and rent 0.2 percent. The BLS release text gave no sign of broad acceleration beyond shelter, used cars and fares. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-10-14] Consensus ran below the threshold before the print. FactSet had core at 0.2% m/m and held steady at 2.4% y/y for September. The sell-side preview consensus (Dow Jones 2.5%) put core a long way under 3%. The one post-print year-end forecast found, Kiplinger's Payne, is core at 2.7%, 0.4–0.5pp below the strike. Payne believes core CPI will be at 2.7% by year-end. https://www.kiplinger.com/investing/economy/cpi-report-september-2026-what-to-expect - [2026-10-15] Cleveland Fed nowcast skill for core is weak in both directions. The September nowcast was 2.39% against an actual 2.6%, a miss of 0.2pp. A repeat miss on October–December would still leave December near 2.8–3.0%, because the October nowcast is 2.48% y/y per colleagues. A miss of this size is the typical error, not a large one. https://www.indmoney.com/blog/us-stocks/us-september-cpi-inflation-forecast-fed-rate-cuts - [2026-02/04] The shutdown base distortion has a fixed size and is already mostly in the data. BLS carried October 2025 rents forward from April 2025, so rent and OER were unchanged for October. BLS and KPMG said the shelter understatement would persist until the April 2026 methodology update, so part of the catch-up should already be in 2026 prints. KPMG said the 12-month measures were hardest hit, until shelter methodology is updated in April. That limits how much extra y/y lift remains for Oct–Dec 2026. The rest is the low Sept→Dec 2025 base, which I estimate at about 0.4pp of 12-month lift. https://www.bls.gov/cpi/additional-resources/2025-federal-government-shutdown-impact-cpi-faq.htm and https://kpmg.com/us/en/articles/2026/december-2025-cpi.html - [2026-10-15] Core goods are weak, which caps the pass-through. Core goods are up only 0.7% y/y, per colleagues. Used cars are still 1.5% below year-earlier levels. Services at 3.1% y/y cannot lift the total much, since core goods are about a quarter of core. Energy pass-through into core so far is visible mainly in transport and airfares. https://www.usinflationcalculator.com/inflation/us-cpi-sept-2026-inflation-hits-3-7-as-gas-prices-surge/100073364/ - [2026-10-14] Demand and labour are soft, which works against a second-round surge. September payrolls rose 29,000 and unemployment was 4.2%. Piedmont also says real wages fell for a third straight month, and nominal wages are up 3.0% y/y, only 0.4pp above core. The tailwinds that normally sustain 0.4% monthly core prints are absent. Average hourly earnings rose just 0.1% in September. https://piedmontcrescentcapital.com/september-cpi-2026-gasoline-moves-the-headline-services-move-the-trend/ - [2026-10-14] Resolution mechanics favour NO at the margin. The release schedule has the final print on Jan 13, 2027, the same day trading closes. The rounding rule is strict: the question says "more than 3.1%" using the one-decimal published value, so 3.1% resolves NO. The shutdown clause extends expiry only if BLS delays the data. Nothing in my research indicates a Q4 2026 shutdown, so a delay is not a route to YES. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-10-12] Trader sentiment in Kalshi-based coverage is core 12-month around 2.7% by late 2026, per colleagues. Even the high-side tail quoted is 6% on the downside below 2.2%, which implies a distribution centred well under 3.1%. The distribution is skewed up, but the median is 0.4pp from the strike. https://www.cnbc.com/2026/10/12/inflation-will-remain-sticky-in-2026-according-to-prediction-markets.html BOTTOM LINE: A YES needs the Sept pace of about 0.33–0.35% a month to hold for three months straight, on top of a low Oct–Dec 2025 base. Both the Cleveland nowcast (about 0.21% for October) and the 6- and 12-month trends sit below that, as do the economist and market medians near 2.7%. The No case is strong; the main risk to it is persistent energy pass-through into services. NOT FOUND: the unrounded Oct–Dec 2025 core index levels (the base is my inference), a post-September consensus for the October and November core prints, a published December 2026 core CPI consensus, and any report of a Q4 2026 shutdown risk.