CPI year-over-year in Jun 2026?

rationale:

The resolution for June 2026 CPI year-over-year (YoY) depends on the not-seasonally-adjusted (NSA) monthly change applied to the May 2026 NSA index (335.123) bls.gov against the June 2025 base index (322.561) bls.gov. Following May's 4.2% YoY print bls.gov, mathematical thresholds indicate that a June NSA monthly change between roughly -0.14% and -0.04% maps to a 3.8% YoY print, -0.04% to +0.05% yields 3.9%, and +0.05% to +0.15% yields 4.0%.

Energy is the primary swing factor. May's elevated 4.2% YoY print was largely inflated by a spike in gasoline (+7.0% MoM) resulting from the US-Iran conflict bls.gov. Following a June 14 ceasefire, pump prices have collapsed. AAA national average gasoline prices dropped from a peak of $4.56 on May 21 to $3.999 by June 18 gasprices.aaa.com. Weekly EIA data reflects this sharp decline, falling from $4.305 on June 1 to $4.052 by June 15 eia.gov. This crash is expected to subtract roughly 0.25 to 0.40 percentage points from headline CPI. However, because the steepest declines are back-loaded in mid-to-late June, the monthly average will not drop as drastically as end-of-month spot prices suggest.

Offsetting this energy drag is firm core inflation, which limits the downside. This tension creates a divergence between real-time market pricing and tracking models. The liquid Kalshi market heavily favors dovish outcomes of 3.8% and 3.7%, effectively pricing in a maximum drag from the recent gas price collapse. Meanwhile, the Cleveland Fed nowcast remains more hawkish, tracking headline CPI at +0.02% MoM and +4.01% YoY clevelandfed.org, supported by sticky core components.

Synthesizing these dynamics, a slightly negative to flat NSA monthly change is the most plausible scenario. The modal estimate is Exactly 3.8% (34%), balancing the energy drag against the monthly averaging effect. There is substantial upside risk toward Exactly 3.9% (24%) and Exactly 4.0% (10%) if persistent core inflation offsets the gasoline drop more than expected, or if back-loaded gas declines fail to pull down the monthly average significantly. Conversely, Exactly 3.7% (21%) captures the downside risk of an outsized energy drag. Outcomes between 2.0% and 3.3% are mathematically impossible absent an unprecedented single-month deflationary collapse across all sectors, and are assigned 0%. The 'Other' bin (11%) captures realistic tail risks of 3.6% and below, or 4.1% and above.