Will headline CPI fall below 3.5% year over year before December 31, 2026?

As of mid September 2026, we have approximately 3.5 months until year end. The Fed has held rates steady at 3.50 to 3.75 percent since June 17, 2026, and the June SEP median projects the funds rate at 3.8 percent by year end, with nine of eighteen participants expecting rates above the current range, suggesting bias toward holding or hiking rather than cutting. For headline CPI to fall below 3.5% year over year by December 31, 2026 requires meaningful disinflation in the final quarter. The Fed's hawkish pivot away from its prior cutting bias in June (evidenced by the higher SEP projection versus March's 3.4 percent median) indicates policymakers see limited urgency to ease policy, which would constrain the disinflationary impulse needed. Historical patterns show that headline CPI tends to be stickier than core CPI, particularly in the final months of the calendar year due to seasonal factors and energy price volatility, making sub 3.5% achievement relatively difficult without either a significant demand shock or further disinflation that appears inconsistent with current policy messaging.