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Inflation Reaches 3.6% as Household Buying Power Weakens and Mortgage Relief Remains Elusive

September PCE inflation rose to 3.6% year over year as real disposable income fell, complicating prospects for lower mortgage borrowing costs.

Hand holding house keys and household bills illustrating inflation and mortgage affordability pressures
Illustrative household finance photograph. Photo: Jakub Żerdzicki / Unsplash (https://unsplash.com/@jakubzerdzicki).

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The Federal Reserve’s preferred measure of inflation accelerated in September, while inflation-adjusted household income fell and Americans saved a smaller share of their earnings. The combination offers little immediate comfort to homebuyers and mortgage lenders hoping for a sustained decline in borrowing costs.

The personal consumption expenditures price index rose 3.6% from a year earlier, up from 3.4% in August, according to the Bureau of Economic Analysis report released October 29. Excluding food and energy, the core PCE index increased 3.1% over 12 months, compared with 3.0% in August. Both readings remain above the Fed’s 2% inflation objective.

The report covers September household spending and prices. Its October 29 publication should not be mistaken for a sudden one-day increase in prices or a new October transaction.

Prices rise faster than household incomes

On a monthly basis, the overall PCE price index increased 0.5% in September, following a 0.3% gain in August. The core index rose 0.3%, matching the prior month. The distinction between monthly and year-over-year figures matters: 0.5% is the September monthly change, while 3.6% measures the increase over the previous 12 months.

Personal income rose $54.5 billion, or 0.2%, and disposable personal income also increased 0.2%. But after adjusting for inflation, real disposable personal income fell 0.3%. In practical terms, average household purchasing power moved backward during the month even as nominal pay and other income sources increased.

Consumer spending rose $113.1 billion, or 0.5%, in current dollars. Inflation-adjusted spending was essentially unchanged, rising less than 0.1%. The personal saving rate slipped to 3.8%, and personal saving totaled $911.1 billion.

For households trying to accumulate a down payment, slower real income growth and reduced savings can be as consequential as mortgage rates. A buyer may face a higher monthly payment while also having less room in the budget to build cash reserves or absorb closing costs.

Why mortgage markets are watching

The Federal Reserve left its benchmark rate unchanged at 3.75% to 4.00% on October 28, with two officials favoring an increase. September’s inflation report adds to the argument that the central bank may have limited room to ease policy quickly.

Mortgage rates are not set directly by the Fed’s overnight target. They reflect longer-term Treasury yields, mortgage-backed securities pricing and investor expectations about future inflation and policy. Persistent inflation can keep those longer-term financing costs elevated even when the Fed leaves its own rate unchanged.

That pressure is visible in the housing market. Homebuilders have reported weaker orders and continued use of incentives to attract buyers. Mortgage application activity remains sensitive to modest weekly changes in rates. A strong national economy does not necessarily restore affordability if inflation erodes household income and financing stays expensive.

Different measures tell different stories

The BEA also released its advance estimate of third-quarter gross domestic product on October 29, showing annualized growth of 3.4%. That report put the quarterly annualized PCE inflation rate at 2.1%, a different calculation from the September monthly report’s 3.6% year-over-year reading.

Those numbers are not contradictory. One measures the price change across the third quarter at an annualized rate; the other compares September prices with September 2025. Mixing them can create a misleading impression of whether inflation is accelerating or easing.

The September report also shows a divergence between dollar spending and real consumption. Consumers spent more in nominal terms, but much of that increase was absorbed by higher prices rather than greater volumes of goods and services.

What comes next

The next monthly PCE report, covering October, is scheduled for November 25. Between now and then, mortgage markets will watch inflation expectations, Treasury yields, employment and the Federal Reserve’s communications for clues about the cost of borrowing.

For the housing industry, the September numbers reinforce a familiar constraint: affordability cannot improve sustainably through nominal income growth alone if the cost of living and the cost of credit continue to rise. The BEA’s original release provides the underlying income, spending and inflation figures.

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