BEA methodological adjustments could lower U.S. core PCE inflation by about 20 bps

Overview

This report analyzes the upcoming BEA methodological revisions to the U.S. PCE price index and their impact on core PCE inflation, Federal Reserve policy expectations, and the broader inflation narrative. Nomura expects that BEA's technical adjustments to computer software and accessories, portfolio management and investment advisory services, and legal services will lower year-over-year core PCE inflation by about 20 bps and narrow the gap between core PCE and CPI.

Core views

The core view is that U.S. core PCE inflation may peak in the coming months and gradually decline. In addition to the BEA methodological revisions, the upward tariff effect on inflation is weakening, lower oil prices are expected to feed through with a lag to lower energy-sensitive components such as air fares, slower wage growth helps cap price increases in wage-sensitive services, and negative residual seasonality in Q3 and Q4 should reduce month-over-month core PCE. The report therefore lowers its 2026 Q4 core PCE forecast and expects the Fed's hawkish policy path risk to decline.

Analysis framework

The report uses a component decomposition approach, assessing the contribution of three PCE components to be remeasured under new methodology to year-over-year core PCE inflation and supercore PCE. It also runs scenario estimates of component inflation rates under old and new methodologies. In addition, the report combines tariff, oil, wage-growth, residual seasonality, AI-related cost pressures, and supply-shock risks to form a comprehensive view of future inflation momentum.

Methodology notes

• Inflation component decompositionCore PCE contribution decomposition

  Decompose the contribution of PCE components affected by methodological changes into year-over-year core PCE inflation.

  The report notes that as of May 2026, the three components—computer software and accessories, portfolio management and investment advisory services, and legal services—collectively contributed about 60 bps to year-over-year core PCE inflation, forming the basis for estimating the impact of methodology changes.

• Methodology change assessmentPCE-CPI basis comparison

  Compare coverage and weighting differences between PCE components and CPI or PPI source data.

  For example, the computer software and accessories component currently relies partly on a corresponding CPI index, but CPI includes flash storage drives with large price increases, whereas the BEA category does not include physical components; the new method will add PPI software release and IT infrastructure services data.

• Policy implication assessmentInflation momentum and Federal Reserve path assessment

  Evaluate Federal Reserve policy risk based on changes in inflation forecasts.

  The report believes weaker inflation momentum would ease some inflation concerns, thereby lowering hawkish risks around the Fed maintaining its policy rate through 2027.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• U.S. rates

  A downward revision to core PCE and weaker inflation momentum typically lowers the upside risk for policy rates.

  Strengths

  Cooler inflation supports reduced upward pressure on yields and lowers the probability of a more hawkish Fed path.

  Weaknesses

  The report still maintains a long-term hold for the Federal Reserve rather than a clear move toward easing, so the impetus for rate cuts is limited.

  Comparison

  Compared with the previous 2026 Q4 core PCE forecast of 3.3%, the new 3.1% forecast indicates marginally eased inflation pressure.

  Risks

  AI-related cost pressures, semiconductor shortages, and supply shocks from geopolitical or weather events could again push up goods inflation.

• U.S. dollar

  Lower inflation pressure and reduced hawkish risk could weaken the interest-rate-differential support for the dollar.

  Strengths

  If markets further price in less restrictive policy, upward momentum in the dollar may be capped.

  Weaknesses

  The report does not provide explicit FX trading recommendations, and the Fed is still expected to remain on hold.

  Comparison

  Dollar impact depends on how the pace of U.S. inflation decline compares with that of other economies.

  Risks

  If inflation upside risks reemerge or global risk appetite deteriorates, the dollar could still receive support.

• U.S. inflation-linked assets

  A technical downward revision to core PCE and lower inflation expectations may affect inflation-risk premia and inflation compensation pricing.

  Strengths

  The report provides a quantitative framework for how statistical-definition changes affect inflation data.

  Weaknesses

  The transmission from PCE methodology changes to CPI-linked assets is not fully aligned.

  Comparison

  The report suggests the PCE methodology adjustment threshold may be lower than for CPI, which is more tightly linked to Social Security and TIPS.

  Risks

  If the BLS later adjusts CPI estimation methodology, the definition risk for inflation-linked assets would rise.

Key data

• Estimated impact of methodology changes on core PCEabout -20 bpsEstimated total impact of BEA's methodological changes to three PCE components on year-over-year core PCE inflation.
• Current contribution from components affected by methodology changesabout 60 bpsAs of May 2026, combined contribution of the three relevant components to year-over-year core PCE inflation.
• Impact of the computer software and accessories componentabout -8 bpsThe new methodology estimates that this component's year-over-year rate could decline from around 14.5% to around 8%.
• Impact of the portfolio management and investment advisory services componentabout -14 bpsThe new methodology estimates this component's year-over-year rate could decline from 21.6% to 14%, lowering supercore PCE by more than 20 bps.
• Impact of the legal services componentabout +3 bpsUnder the assumption of equal weighting of relevant PPI components, legal services PCE prices may be revised up year-over-year from 2.5% to around 6.5%.
• 2026 Q4 core PCE forecast3.1%Nomura lowered its forecast by 20 bps from 3.3% previously.
• 2027 Q4 core PCE forecast2.4%The report expects core PCE to decline further in a soft manner thereafter.
• Peak impact of tariffs on core PCEabout 0.4-0.5 percentage pointsThe report says the tariff impact has peaked and is now reversing.

Impact & implications

The main implication for markets and policy is that core PCE inflation may be lower than previously expected due to both statistical methodology changes and underlying cooling, which would ease inflation pressure on the Federal Reserve. The report maintains the view that the Fed policy rate will remain unchanged through 2027, but says hawkish risk is reduced. On the other hand, the report also emphasizes that the timing and cumulative effect of the methodology changes could raise concerns over political interference in inflation statistics and policy narratives.

Risks

• AI-related price pressures could pose upside inflation risk, and ongoing global semiconductor shortages and planned semiconductor price hikes could raise consumer electronics prices.
• Post-pandemic goods-price inflation may be more sensitive to supply shocks; adverse weather or geopolitical risks may make goods inflation more persistent.
• Although the PCE methodology adjustment is defendable at the component level, its timing and cumulative impact may raise concerns over political inflation statistics and Federal Reserve policy narratives.
• The new methodology for portfolio management and investment advisory services will rely on employment and service-survey data, which may lead to more frequent revisions in the initial and subsequent months.
• Future BLS member turnover or CPI methodology changes could further alter the inflation data path.

What to watch

• Whether the new methodology for three PCE components takes effect in BEA's September 30 GDP annual revision.
• The revision magnitude for the computer software and accessories, portfolio management and investment advisory services, and legal services components.
• Whether the gap between core PCE and core CPI narrows as expected.
• Whether negative residual seasonality restrains quarter-on-quarter core PCE in Q3 and Q4.
• Subsequent changes in tariff impacts, oil and jet fuel prices, wage growth, PPI electronics prices, and consumer electronics prices.
• Whether Federal Reserve officials reduce hawkish phrasing as inflation cools.