Will CPI Core rise more than 0.3% in December? — Above 0.3%

- [2026-10-14] BLS (resolution source) shows September 2026 core CPI (all items less food and energy) at +0.3% m/m seasonally adjusted, the same as August. The 12-month rate was 2.6%, up from 2.4%. Recent monthly prints on that basis: Mar 0.2, Apr 0.4, May 0.2, Jun 0.0, Jul 0.2, Aug 0.3, Sep 0.3. Only April printed above 0.3. https://www.bls.gov/news.release/cpi.htm - [2026-10-14] September core was above consensus. CNBC cites estimates of 0.2% m/m and 2.5% y/y. Unrounded core was about 0.33–0.335%, the highest since April, per PNC and TheStreet. Only 11 of 73 Bloomberg-surveyed economists had forecast 0.3%. https://www.pnc.com/content/dam/pnc-com/pdf/aboutpnc/EconomicReports/EconomicUpdates/2026/PNC_Economics_Research_CPI_14_October_2026.pdf - [2026-10-14] PNC says the September strength was broad. Shelter rose 0.39% (hotels about +2%), supercore (core services ex-shelter) rose 0.34%, and core goods rose 0.25%, the fastest since Jan 2025. PNC says higher diesel costs are replacing tariffs as the main driver of goods inflation. Core CPI has run at a 3.4% annualized pace over three months. https://www.pnc.com/content/dam/pnc-com/pdf/aboutpnc/EconomicReports/EconomicUpdates/2026/PNC_Economics_Research_CPI_14_October_2026.pdf - [2026-10-14] Headline CPI rose 0.6% m/m and 3.7% y/y. Gasoline rose 9.1% and energy 5.2% amid the US–Iran war that began in late February. Energy is up 20.4% y/y. CNBC says Fed officials fear the energy shock could spread into broader prices. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-14] Core CPI components, per BLS: shelter +0.4 (OER +0.3, rent +0.2, lodging +2.0), used cars +0.7, airfares +1.2 (+22.4% y/y), apparel +0.3, core goods +0.3, and communication −0.2. https://www.bls.gov/news.release/cpi.htm - [2026-10-14] Market and Fed context: CNBC reports odds of a Fed rate rise before year-end above 96%, with a near 50-50 chance of a 50bp hike by December. The next FOMC decision is Oct 28. PNC expects hikes in December and March. Kiplinger quotes a forecaster who sees year-end core CPI at 2.7% y/y. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-14] Kiplinger and others describe the September report as "hotter" than expected. One quoted analyst notes "recent dovish Fed-speak" from Williams and Jefferson. https://www.kiplinger.com/investing/economy/cpi-report-september-2026-what-to-expect - [2026-10-14] BLS schedule: the October CPI comes out Nov 10, 2026, and the November CPI on Dec 10. The December 2026 CPI, which is the one this contract settles on, comes out Jan 13, 2027 at 8:30 ET. That is the same day trading closes. https://www.bls.gov/schedule/news_release/cpi.htm - [2026-01-13] Last year's December core print was +0.2% m/m (2.6% y/y), below the 0.3% consensus. Analysts at the time cited government-shutdown distortions in late-2025 data. The BLS did not publish October 2025 CPI because of that shutdown. https://www.cnbc.com/2026/01/13/cpi-inflation-report-december-2026.html - [2026-05 survey] The Philadelphia Fed Q2 SPF (about 156 days old) projected 2026 Q4/Q4 core CPI at 2.9%. Trading Economics models project core m/m trending to about 0.2% in 2027 and about 0.3% by end of quarter. These are stale and model-based. https://www.philadelphiafed.org/surveys-and-data/real-time-data-research/spf-q2-2026 - [2026-10-14] Rounding: BLS reports one decimal, so a Yes needs a printed 0.4% or higher. A printed 0.3% resolves No, and an unrounded 0.35% or more rounds to 0.4. https://admiralmarkets.com/analytics/traders-blog/us-cpi-preview-september-2026-forecasts-and-the-core-cpi-outlook - [2026-10-18] No federal shutdown affecting the BLS was found as of today. The shutdown clause could matter only if one disrupts the Jan 13 release. This is not confirmed either way beyond the search results. BOTTOM LINE: Core CPI has been running at 0.3% m/m, about 0.33% unrounded, for two months, with pressure broadening in shelter, goods and supercore from the energy shock. The December print needs to round to 0.4% or more for Yes, and the last such print was in April. Two more CPIs (Nov 10 and Dec 10) arrive before the Jan 13, 2027 release and will shift the trend picture. NOT FOUND: Consensus or nowcast forecasts for October, November or December 2026 core m/m. The Cleveland Fed nowcast for December. December-specific seasonal factors. Any confirmed shutdown risk for January 2027.

- [2026-10-14] BLS (primary): Core CPI (all items less food and energy) rose 0.3% m/m SA in September, as it did in August. The 12-month rate was 2.6%, up from 2.4%. Headline rose 0.6%, and gasoline rose 9.1%. https://www.bls.gov/news.release/cpi.nr0.htm - [2026-10-14] September core was 0.3% against a 0.2% consensus. TD notes a 3-month annualized core rate of 3.4%, with core services at 0.4% m/m and shelter at 0.4%. https://economics.td.com/us-cpi - [2026-10-14] CNBC reports the September core print as hotter than expected. It says the US-Iran war launched in late February is driving energy costs, and that rate-hike odds are above 96% by December. https://www.cnbc.com/2026/10/14/cpi-inflation-report-september-2026.html - [2026-10-16] Cleveland Fed nowcast: October 2026 core CPI is 0.21% m/m. Q4 2026 core CPI is 3.02% annualized, which is roughly 0.25% per month. No December-specific figure is published yet. The model tends to run low on core: it nowcast 0.20 for September, and the actual was 0.3. https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting - [2026-10-14] Sep-2026 core CPI hit 0.3% twice in a row, but "above 0.3%" needs a rounded print of 0.4% or more. In the BLS single-decimal data, 0.3% resolves No. The threshold is the 0.4+ tail. - [2026-10-12] CNBC on Kalshi traders: they expect core to stay sticky, with a low chance of core falling to 2.2% this year. Kiplinger quotes one economist forecasting year-end core of 2.7% y/y. https://www.cnbc.com/2026/10/12/inflation-will-remain-sticky-in-2026-according-to-prediction-markets.html - [2026-05 approx] Philadelphia Fed Q2 2026 SPF: Q4/Q4 2026 core CPI is 2.9%, which is about 0.24% per month on average. https://www.philadelphiafed.org/surveys-and-data/real-time-data-research/spf-q2-2026 - [2026-04] Cleveland Fed research finds core goods inflation is typically lowest in November and December (SA data), then rebounds in January. Core inflation has its lowest values in those two months. https://www.clevelandfed.org/publications/economic-commentary/2026/ec-202604-residual-seasonality-in-some-components-of-pce-inflation - [2024] Richmond Fed: December has a negative mean seasonal residual that is statistically significant in NSA data. There is no evidence of residual seasonality in SA core CPI over 20-year windows. This implies December is not biased high. https://www.richmondfed.org/publications/research/economic_brief/2024/eb_24-13 - [Historical, from memory, not re-verified this session] December core CPI m/m SA: 2018 0.2 (confirmed by the FXStreet/BLS snippet at https://www.fxstreet.com/amp/news/us-annual-core-cpi-stays-unchanged-at-225-in-december-as-expected-201901111332), 2022 0.3, 2023 0.3, 2024 0.2, 2025 0.2. Prints of 0.4+ in December are rare outside the 2021 high-inflation period. Outside 2021–22, almost all Decembers were 0.2–0.3. - [2026-10-17] Core PPI (ex food, energy and trade) rose 0.5% in the latest month and is up 5.0% y/y. This is a possible pipeline pressure on core goods. https://tiltmacro.substack.com/p/the-navigators-brief-10-17-2026 - [2026-10-14] The December CPI release is scheduled for about January 2027, before the 2027-01-13 close. The October CPI is due 2026-11-10, with no October y/y published because of last year's missing data. Shutdown-extension language applies only if a new shutdown disrupts the release. BOTTOM LINE: The base rate for a December core print of 0.4% or more is low. Recent months run at 0.3%, forecasters' implied pace is about 0.2–0.25% per month, and December SA core has historically been soft. Upside tail risk is elevated by the energy shock, hot core services and core PPI, so this is a minority outcome with fatter tails than usual. NOT FOUND: Any December 2026 core CPI consensus, Kalshi strike ladder for December, or a Cleveland Fed December nowcast. A fetched page confirming the 2022–2025 December core prints. The Advisor Perspectives page returned 403.

YES means: the BLS seasonally adjusted core CPI (all items less food and energy) for December 2026, published Jan 13, 2027, prints at 0.4% or higher month over month. A printed 0.3% resolves No. - [2026-10-16] BLS import prices rose 1.1% in September after 0.5% in August, and are up 8.1% y/y, the most since July 2022. Nonfuel imports rose 0.7%, and imports ex-food and fuels rose 0.7% in both August and September. Import-price cost pressure on goods is building, and goods reach CPI with a lag. https://www.bls.gov/news.release/archives/ximpim_10162026.htm - [2026-10-16] BLS import-price detail: consumer goods ex-autos rose 0.4% in September (IndexBox summary of the BLS release). This feeds the core goods line, which the Oct 14 CPI already showed accelerating. https://www.indexbox.io/blog/us-import-and-export-prices-rise-sharply-in-september-2026/ - [2026-10-16] Per FXStreet's analysis of the PPI, September PPI rose 1.3% m/m and 6.3% y/y, the most since 2022. Core PPI rose 0.7% in the month (the Oct 17 colleague figure of 0.5% is a different definition). Producer diesel jumped 21% in the month and is up 115% y/y. The article says input costs at the production and distribution stage can eventually be passed to consumers. I could not fetch the page (403), so this rests on the search snippet. https://www.fxstreet.com/analysis/the-fed-just-got-a-second-hot-inflation-number-heres-what-the-diesel-signal-is-really-saying-202610161344 - [2026-10-14] Fetched investingLive piece: the Beige Book says diesel was cited 21 times, versus 2 in the prior edition. Three districts called price growth robust, and three others said it was intensifying. Dallas Fed contacts named diesel as the top cost driver, affecting freight, agriculture and airfares. This is a mechanism for cost pass-through into core goods and services over the coming months. https://investinglive.com/central-banks/fed-catch-up-goolsbee-calls-cpi-discouraging-as-beige-book-flags-diesel-fuelled-price-pressure/ - [2026-10-14] Chicago Fed's Goolsbee, in the same fetched article, said services inflation is above 5% and cannot be blamed on tariffs or oil. He called demand-driven overheating the bigger worry. If services strength is demand-driven, it is less likely to fade when energy eases. https://investinglive.com/central-banks/fed-catch-up-goolsbee-calls-cpi-discouraging-as-beige-book-flags-diesel-fuelled-price-pressure/ - [2026-10-14] Pre-release, 14 bank forecasters had core at 0.22% for September. The range was 0.16% to 0.24%, and the actual was about 0.33%. Forecasters undershot by about 0.1pp, which shows the forecast distribution has been skewed low. Bank of America had flagged upside risk. https://investinglive.com/news/us-cpi-preview-14-investment-bank-forecasters-see-energy-lifting-headline-to-3-6-core-held-near-0-2/ - [2026-10-16] The Kalshi October core market showed "above 0.2%" at about 13% (page snapshot dated about Oct 10). That was before the hot September print, so it is stale. It shows the market had been pricing a low-core regime just before the upside surprise. The related Oct combo market put "both 0.4%+" at 9%. https://kalshi.com/markets/kxcpicore/cpi-core/kxcpicore-26oct - [2026-10-13] Morgan Stanley notes airfare CPI is up 23% y/y. Used cars rose 0.7% in September, and shelter rose 0.4%. Fresh energy cost continues to feed airfares and delivery. Airfares rose more than 2% in both July and August, then 1.2% in September. https://www.nbcnews.com/business/economy/s-fueling-inflation-fuel-rcna603184 - [2026-10-12] Oil was still high: Brent was about $104.6 on Oct 12 and diesel was $6.20 in the week to Oct 5, about $2.49 above a year earlier. Hormuz tanker attacks are described as at a record. Continued high fuel costs are the prerequisite for another round of pass-through. https://discoveryalert.com/analysis/oil-price-inflation-fed-rate-hike-supply-shock-october-2026/ - [2026-10-16] The Cleveland Fed nowcast was updated on 10/16. It has Q4 core CPI at 3.02% annualized and October at 0.21%. Q4 at 3.02% annualized is about 0.25% a month, so a 0.35%+ December needs about 0.1pp above the model. The model undershot September by about 0.1pp. https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting - [2026-01-13] Last December's print was a 0.2% core gain, 0.1pp below consensus. That reflected shutdown distortions in rents and goods. This year has no such drag, so it is not a good guide to the base. https://www.cnbc.com/2026/01/13/cpi-inflation-report-december-2026.html - Most likely path to YES: diesel and freight costs keep feeding core goods (0.25% in September already) and airfares. Shelter stays at 0.3–0.4% on hotel and OER strength. Supercore holds at 0.3–0.4%. Unrounded core then lands at about 0.35% or more in December. That needs both goods and services to run hot at once, and no December seasonal softness. BOTTOM LINE: The Yes case rests on a skew to upside surprises, now in a real pass-through regime. Import prices, PPI, the Beige Book and sticky services all point to rising cost pressure. Even so, Yes needs a print about 0.1pp above the consensus-type pace of 0.25%, in a month where Cleveland Fed research flags seasonal softness. That is a tail, not the base case. NOT FOUND: Any December 2026 core consensus, a nowcast for December, or a current Kalshi strike ladder for December. I also could not fetch the FXStreet page. I found no sell-side forecast with December core at 0.4% or higher.

YES means: the BLS seasonally adjusted core CPI (all items less food and energy) for December 2026 is printed at 0.4% m/m or higher. A printed 0.3% or lower resolves No. - [2026-01-13] BLS (fetched) has December 2025 core at +0.2% m/m, with core goods at 0.0%. That 0.0% is a December-specific drag: used cars −1.1%, apparel +0.6%. The release shows no December 0.4+ in the 2025 series. - The Dec 2025 core print came with Oct and Nov 2025 missing, which is a distortion. Even so, a quiet December goods month is the base case. - https://www.bls.gov/news.release/archives/cpi_01132026.htm - [2024-12 to 2023-12] BLS archive releases (search results) show December core at 0.2% for 2024 and 0.3% for 2023. Both were softer than or equal to the preceding months. In 2024 core had been 0.3% for four months before the December 0.2%. A "0.3 run, then December cools" pattern has precedent. - https://www.bls.gov/news.release/archives/cpi_01152025.htm - https://www.bls.gov/news.release/archives/cpi_01112024.htm - [2026-10-16] The Cleveland Fed nowcast (fetched via search) puts October core at 0.21% m/m. Its Q4 core is 3.02% annualized, so the model implies about 0.25% a month. A Yes needs about 0.35% or more unrounded, which is well above that path. - The same model nowcast 0.20 for September and the actual was 0.3, so it runs low. Even a 0.1 miss leaves December at about 0.3. - https://www.clevelandfed.org/indicators-and-data/inflation-nowcasting - [2026-10-14] Pre-release consensus was 0.2% core, with a range of 0.2–0.3% (FinancialJuice). Not one forecaster had 0.4%. The September upside surprise came partly from a one-off wireless/communications effect in August and from hotel prices (+2.0% lodging). These are volatile items that tend to reverse. - https://features.financialjuice.com/2026/10/12/us-cpi-prep-14th-october/ - [2026-10-14] Investing.com and ForexFactory both log core at 0.3% against a 0.2% forecast. Even the hot September core was 0.3% as printed, not 0.4%, with shelter lifted by lodging. April is the only 0.4 of 2026, so a repeat takes a fresh shock. - https://www.forexfactory.com/calendar/79-us-core-cpi-mm - [2026-10-17] Core PPI ex food, energy and trade is +0.5% m/m and +5.0% y/y. Against that, core CPI is only +2.6% y/y. The pipeline pressure has so far not passed through to consumer core, and retailer margins have been absorbing it. This is a risk to the No case, but it has failed to show up in CPI for months. - https://tiltmacro.substack.com/p/the-navigators-brief-10-17-2026 - [2026-10-14] Atlanta Fed dashboard: core CPI is +2.6% y/y, Cleveland median CPI +2.6% and trimmed mean +2.7%. Breadth measures are not signalling acceleration beyond a 0.2–0.3% monthly pace. The distribution is anchored on 0.2–0.3. - https://www.atlantafed.org/research/inflation-project/underlying-inflation-dashboard - [2026-10-14] Fed-hike context: the Fed hiked to 3.75–4.00% on Sept 16, with more hikes priced (Yahoo, citing Quartz). Tightening, plus Vanguard's view that moderating wage growth and price-sensitive consumers should bring inflation lower, point to demand-side restraint on core by December. - https://finance.yahoo.com/economy/articles/vanguard-economist-says-sticky-inflation-120300588.html - [2026-10-14] The 2026 CPI standard error for 1-month changes is about 0.03 pp (BLS technical note, fetched). Sampling noise alone can move a 0.33 trend print across the 0.35 rounding line, but it is symmetric. With a central trend of about 0.25–0.30, the 0.4+ tail needs about +0.1 pp of surprise. - https://www.bls.gov/news.release/archives/cpi_01132026.htm - [2026-10-18] Shutdown clause: the CR funds the government only through Dec 11, 2026 (CRS, search). Appropriators had made no progress by early October, and a lapse from Dec 12 is possible. The 2025 shutdown cancelled the October CPI outright, and BLS has the December CPI due Jan 13. - A shutdown that delays the release would extend the deadline rather than resolve the market, so it does not by itself produce a No. If BLS skipped the release entirely, the outcome is ambiguous. - The Wikipedia page on 2026 shutdowns, and Center Square via Yahoo, say Congress was in recess until after the midterms. - https://www.congress.gov/crs-product/R49353 - https://www.yahoo.com/news/politics/articles/congress-faces-tight-government-funding-211000997.html - [2026-10-17] The tiltmacro conditional path has headline CPI rising in Nov–Dec. That is energy-driven. The strike here is core-only, and energy pass-through into core (airfares, transport) has been running through lagged channels. Airfares are already +22% y/y, so there is a mean-reversion risk there as well. - https://tiltmacro.substack.com/p/the-navigators-brief-10-17-2026 BOTTOM LINE: The No case is the default. The strike needs a printed 0.4+, which only April has produced in 2026 (per colleagues' Oct 14 list). Nowcasts imply about 0.25% a month and Decembers have been soft, and recent 0.3 prints depended on volatile items. The risks to No are an energy and PPI pass-through surprise and a possible shutdown (from Dec 12), which would delay the release and leave the market open. NOT FOUND: A December 2026 core consensus or nowcast, a Kalshi strike ladder, the 2026 December seasonal factors, and a 2022 December print (not fetched). The Congress.gov CRS page was fetched but returned a permission error, so its facts rest on the search snippet.