Rising global oil prices driven by US-Iran tensions have limited overall drag on US household consumption, but the distributional effects across income groups are significant. Lower and middle-income groups systematically allocate a higher share of their spending to energy and food compared to high-income groups. Combined with their higher marginal propensity to consume, a 10% oil price increase burdens the consumption of the lowest 20% income households approximately 2.5 times more than the highest 20% income households. This structural inflation erosion may partially offset the tax cut benefits provided to lower and middle-income groups by the "Big and Beautiful" Act, exacerbating the K-shaped divergence in US household income and consumption patterns.
A 10% rise in oil prices is estimated to reduce US household consumption by 0.15% and GDP by 0.1%, indicating a moderate aggregate impact. Based on prior analysis, such an increase affects US inflation through three primary channels: directly raising energy costs, influencing food prices with about a 9-month lag, and increasing prices for other core goods and services like airfare. In a baseline scenario excluding secondary effects, this would raise CPI by approximately 0.23 percentage points and core CPI by about 0.05 percentage points over one year. The drag on consumption and GDP is calculated from the decline in purchasing power multiplied by the marginal propensity to consume.
Aggregate calculations mask the structural disparities of the oil price shock. Lower-income households are more vulnerable because their consumption baskets are more heavily weighted toward items sensitive to oil prices, and they exhibit a stronger consumption response. Data from the US Bureau of Labor Statistics Consumer Expenditure Survey shows that the lowest 20% income households spend about 1.3 times more of their budget on energy and food compared to the highest 20% income households. This results in a peak inflation impact from a 10% oil price increase that is roughly 1.5 times greater for the lowest income group. Furthermore, the marginal propensity to consume for the lowest income quintile is about 1.6 times higher than that of the highest quintile, further amplifying the negative impact on their real consumption.
Integrating differences in consumption baskets and marginal propensities to consume reveals that the consumption drag from a 10% oil price increase peaks at 0.27 percentage points for the lowest income group, compared to just 0.11 percentage points for the highest income group—a ratio of 2.5 to 1. The erosion of purchasing power for low-income groups from oil price shocks may partially cancel out the modest tax relief they receive from the "Big and Beautiful" Act. In contrast, middle and high-income groups benefit more from tax cuts while suffering less from oil price increases. The combined effects of fiscal policy, tariffs, and oil shocks are likely to intensify the K-shaped divergence in US household income and consumption.
From a GDP perspective, a 10% oil price increase drags on overall household consumption by about 0.16 percentage points and on GDP by 0.11 percentage points. Although the per-household impact is smaller for middle and higher-income groups, their larger share of total consumption means their spending reductions have a greater effect on the aggregate figures. If the Strait of Hormuz reopens relatively quickly, the average oil price for 2026 could reach $80 per barrel, a 15% increase from pre-conflict levels, leading to an estimated drag on 2026 household consumption of 0.23 percentage points and on GDP of 0.16 percentage points.
Key risks include an escalation of Middle East conflicts beyond expectations, which could widen the global crude supply gap and push oil prices higher, increasing structural inflationary pressures in the US and the drag on consumption. Additionally, if high oil prices persist longer than anticipated, the pass-through to energy and food inflation would be more pronounced, potentially leading to a greater-than-expected consumption decline, especially as lower-income households deplete savings.
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