October’s inflation signals are mixed. U.S. gasoline prices have eased from September’s monthly average, and daily mortgage rates have retreated from month-end levels. Yet diesel’s latest weekly increase and still-elevated borrowing costs argue against declaring that inflation pressure has disappeared.
There is also an unusual complication for the next CPI report: missing October 2025 data limit the annual comparison. A higher calculated year-over-year rate can reflect a weak comparison base, but an estimated base must not be confused with an official BLS observation.
This assessment uses fuel and mortgage observations through October 26, 2026, with a Treasury update through October 28.
CPI: the base effect and the missing comparison
The September BLS release reported all-items CPI inflation of 3.7% year over year, not seasonally adjusted (NSA). The monthly increase was 0.6% NSA. Separately, the seasonally adjusted (SA) monthly headline was also 0.6%; core CPI rose 0.3% SA. Equal rounded headlines do not make NSA and SA interchangeable.
A base effect occurs because annual inflation compares today’s price index with its level a year earlier. A low denominator can raise the annual rate even when the current monthly increase is modest.
For illustration, assume a September annual rate of exactly 3.7%, an October 2026 NSA increase of 0.10%, and an estimated October 2025 NSA decline of 0.246%. The calculation is:
[(1.037 × 1.001 ÷ 0.99754) − 1] × 100 = 4.06%.
This is a conditional scenario, not an official October forecast. It rounds to 4.1% at one decimal place using those inputs, rather than precisely 4.0%.
The qualification is essential: BLS says the 2025 shutdown prevented publication of most October 2025 indexes. It will therefore not publish October 2026 12-month changes for affected series. The assumed −0.246% comparison cannot be presented as an independently verified official all-items observation.
The useful analytical principle survives: distinguish current price momentum from the denominator driving an annual comparison. That does not make an elevated price level harmless to households.
Energy: monthly relief, weekly crosscurrents
The EIA monthly table available October 27 shows modest declines in national retail fuel averages. Prices include taxes and are not seasonally adjusted.
| Fuel | September average | October average | MoM change |
|---|---|---|---|
| Regular gasoline | $4.355/gallon | $4.310/gallon | −1.03% |
| On-highway diesel | $6.291/gallon | $6.252/gallon | −0.62% |
These are averages of weekly retail observations, not crude-oil spot prices. They suggest some monthly relief for motorists and freight operators after September’s increase.
However, the latest weekly EIA readings diverge. Regular gasoline fell from $4.284 on October 19 to $4.269 on October 26, a 0.35% decline. Diesel rose from $6.276 to $6.352, up 1.21%.
Lower monthly averages can therefore coexist with renewed pressure late in the month. The evidence supports easing in these monthly fuel measures; it does not establish that all energy components are exerting no inflationary pressure. EIA pump-price changes also cannot be substituted directly for CPI energy changes, which use different weights and collection methods.
Mortgages: rates ease, spreads remain wider
Optimal Blue’s daily mortgage indexes, distributed through FRED, show lower rates on October 26 than on September 30. These NSA indexes measure consumer rate locks; they are distinct from Freddie Mac’s weekly mortgage survey.
| 30-year fixed mortgage | September 30 | October 26 | Change |
|---|---|---|---|
| Jumbo | 7.359% | 7.273% | −8.6 basis points |
| Conforming | 7.386% | 7.203% | −18.3 basis points |
The direction offers marginal relief to new borrowers. It does not imply that October’s average was below September’s: a month can start at high rates, finish lower, and still record a higher average.
Using the Treasury’s same-date 30-year par yields of 5.64% and 5.31%, the simple jumbo mortgage spread widened from 171.9 to 196.3 basis points. The conforming spread widened from 174.6 to 189.3 basis points. Mortgage rates fell less than the Treasury benchmark.
Wider spreads put banking risk in focus
The widening spread deserves attention as a potential warning of greater lending risk and financial friction. Borrowing costs have not fallen as quickly as the Treasury benchmark, leaving households facing a larger financing premium. Part of that premium may reflect compensation for perceived credit risk, although mortgage-backed security pricing, prepayment risk, funding conditions and borrower composition also matter. This simple 30-year comparison is not a duration-matched credit spread and cannot, by itself, establish that expected defaults have risen.
A further interest-rate hike would not necessarily mean higher bank profits. Higher rates can lift income on floating-rate assets and new lending, but they can also raise deposit and wholesale funding costs, weaken loan demand and make debt harder to service. Borrowers with floating-rate debt or refinancing needs are particularly exposed. If more loans become non-performing, lost interest income and higher credit-loss provisions can outweigh gains in lending margins.
An IMF working paper on interest rates and bank profitability finds that the balance varies across banks: for some institutions with greater risk appetite and flexible-rate lending, the loan-loss effect dominates the benefit to interest margins. Higher lending rates can therefore represent compensation for greater risk rather than an improvement in underlying profitability.
That creates a possible policy pressure point. If lenders judge that further tightening would worsen asset quality and increase non-performing loan (NPL) risks, banks and their industry associations could press the Federal Reserve to pause or ease policy on financial-stability and credit-availability grounds. This is a plausible incentive for banking-sector lobbying, not evidence that a coordinated campaign is already under way or that the Fed would change policy in response.
Mortgage financing costs influence housing demand and financial conditions, but mortgage interest rates are not themselves the CPI shelter measure.
Treasury yields: longer maturities retreat
The Treasury’s official daily par yield curve confirms declines at longer maturities between September 30 and October 28.
| Maturity | September 30 | October 28 | Change |
|---|---|---|---|
| 3-month | 4.20% | 4.18% | −2 basis points |
| 5-year | 5.09% | 4.85% | −24 basis points |
| 10-year | 5.29% | 5.05% | −24 basis points |
| 30-year | 5.64% | 5.37% | −27 basis points |
These are constant-maturity par yields, rather than yields on a particular traded bond. The 3-month measure remained above 4%; it should not be confused with a 13-week bill quoted on a discount basis.
Lower long-term yields can ease financing pressure and support equity valuations. They are not proof that inflation has been defeated: growth expectations, policy expectations, term premiums and demand for safe assets also move yields.
What this means for markets
For equities and Nasdaq futures, sustained fuel-price relief and lower long-term yields would generally be constructive if earnings and economic activity hold up. The same yield decline could carry a less favorable message if it reflects deteriorating growth.
The market should therefore assess three separate questions: whether current inflation momentum is easing, whether credit remains available at workable prices, and whether investment spending produces the cash flows needed to service debt.
The last question is particularly relevant to AI infrastructure investment, discussed in ATN’s analysis of AI debt and infrastructure financing risks. Research and development, capital expenditure and financing commitments are different categories; their risks depend on funding structure, maturity and future returns.
An oil supply disruption remains an upside inflation risk. A move toward $110–$120 can be considered a stress scenario, but neither a $90 floor nor a rapid reversal from a spike is assured.
The evidence points to partial relief, not an all-clear. Monthly fuel averages and longer-term yields have eased, while diesel’s latest weekly rise and wider mortgage spreads show continuing friction. Read the next CPI release through its current monthly components and its stated data limitations, rather than treating a reconstructed annual headline as decisive.
Sources and methodology
IMF Working Paper 2025/196: How Do High Interest Rates Affect Banks? The Roles of Loan Losses and Macroprudential Policy examines the competing effects of interest margins and loan losses on bank profitability.
- BLS: September 2026 Consumer Price Index release.
- BLS: missing October 2025 indexes and implications for October 2026 annual changes.
- EIA: monthly U.S. retail gasoline and diesel prices.
- EIA: weekly gasoline and diesel update, released October 27.
- Optimal Blue via FRED: 30-year fixed jumbo mortgage index.
- Optimal Blue via FRED: 30-year fixed conforming mortgage index.
- U.S. Treasury: daily Treasury par yield curve rates.
Percentage changes are calculated as (new value ÷ previous value − 1) × 100. One basis point equals 0.01 percentage point. Mortgage spreads subtract the same-date 30-year Treasury par yield from the mortgage index. October fuel averages reflect available weekly observations through October 26. No inflation deflator is applied: fuel prices are nominal dollar prices, and interest rates are quoted percentages. The CPI scenario uses consistent NSA assumptions and is separate from the official SA monthly headline. Calculations use the displayed source values and are rounded to two decimals where appropriate.