The Bureau of Labor Statistics reported on May 12 that the Consumer Price Index for All Urban Consumers (CPI-U) rose 3.8% year over year in April 2026, the highest reading since May 2023. Energy drove the acceleration, with the energy index up 17.9% and gasoline surging 28.4%. Core CPI (excluding food and energy) came in at 2.8%. Medical care services were unchanged for the month, and the 12-month medical care index decelerated to 2.5%.
For self-insured employers and captives carrying long-tail liabilities, those two numbers pull reserves in opposite directions.
Who it affects
Any organization discounting long-tail GL, auto liability, or workers’ compensation reserves to present value. Public entities following GASB Statement No. 10, captives reporting under statutory or GAAP frameworks, and self-insured employers whose actuaries present discounted reserve estimates all face the same tension: headline inflation keeps the Fed restrictive, while medical inflation appears to be moderating.
The effect is sharpest for programs where claim payments stretch beyond five years: WC lost-time medical tails, construction-defect GL, and severe bodily-injury auto claims.
The reserve mechanism
Discount rates. The FOMC held the federal funds rate at 3.50% to 3.75% on April 29, calling inflation “elevated” for the first time in this cycle. An 8-4 vote and persistent headline CPI above 3.5% make a near-term cut unlikely. The June 16-17 meeting will follow tomorrow’s May CPI release (June 10, 8:30 a.m. ET), and markets are pricing minimal odds of a move in either direction. Higher-for-longer rates raise the discount rate in present-value calculations, reducing the reported liability. That reduction is real, but it can mask a simultaneous severity increase in the underlying nominal reserve.
Severity. The 2.5% medical care CPI headline is misleading for programs with hospital-heavy claim mixes. In March, the hospital outpatient services sub-index ran at 6.4%, nearly triple the broader medical care figure. April’s hospital services component dipped 0.3% on the month, but the year-over-year gap between hospital-specific and aggregate medical inflation remains wide. Self-insured WC programs trending medical severity at the headline medical CPI are understating the cost trajectory for surgical and inpatient claims.
Energy inflation compounds the severity picture outside medical lines. The 17.9% energy surge feeds directly into auto body repair costs, fleet maintenance, and airfares (up 21% year over year), all of which drive commercial auto and GL severity. The tariff-driven severity test we flagged before the April release has now materialized in the data.
What this means for your next review
The May CPI release on June 10 and the FOMC decision on June 17 will either widen or narrow this gap before most programs enter their year-end reserve cycle. Three questions for your actuary before then:
- Are long-tail discount rate assumptions still tied to a 2% inflation baseline, or have they been updated to reflect the 3.50% to 3.75% funds rate and persistent headline CPI above 3.5%?
- Is the WC medical severity trend factor reflecting hospital services inflation (6.4% in March) or the broader medical care CPI (2.5%)?
- How much apparent reserve redundancy in the GL or auto triangle is a discount-rate artifact rather than genuine favorable development?
If the answer to the first question is “still at 2%,” the present-value reserve is understated for the wrong reason. If the answer to the second is “the broader number,” severity is understated for a different wrong reason. Either gap widens with each quarter the assumptions go uncorrected.