May inflation – A Federal Reserve forecasting update puts U.S. inflation on a faster path, driven in part by the Iran-related energy shock. That matters because Social Security’s 2027 cost-of-living adjustment hinges on the Consumer Price Index for Urban Wage Earners and Cler
For Social Security retirees. the yearly cost-of-living adjustment can feel like a lifeline—one that usually comes down to what inflation looks like months earlier.. Now a fresh inflation forecast from the Federal Reserve has raised the odds that the 2027 COLA could land higher than many beneficiaries expect. even as earlier gains have not translated into sustained purchasing power.
The stakes are heightened by the numbers already seen in 2025.. The average monthly retired-worker benefit surpassed $2. 000 for the first time. and Social Security’s cost-of-living adjustment (COLA) came in at 2.8%—the first time in nearly three decades that Social Security payouts have increased by at least 2.5% for five consecutive years.. With another year in reach. the new pressure point is whether inflation accelerates quickly enough to flow into the third-quarter window used for the next COLA calculation.
The timing starts with the way monthly inflation data is released.. Between the 10th and 15th of every month, the U.S.. Bureau of Labor Statistics (BLS) publishes the prior month’s inflation data. showing how prices have shifted compared to the previous year.. The Federal Reserve has targeted 2% long-term inflation since 2012. but trailing 12-month inflation (TTM) has stayed above that level for the last five years.
What makes the current inflation update especially scrutinized is the way the effects of the Iran conflict are beginning to show up.. At the end of February, President Donald Trump gave the green light for U.S.. military forces to commence attacks against Iran.. After those actions. Iran closed the Strait of Hormuz to most commercial shipping vessels. tying up 20 million barrels of petroleum liquids per day—representing 20% of global crude oil demand.. The resulting energy supply disruption has sent crude oil prices higher and started squeezing consumers at the fuel pump. with gas prices rising at their fastest pace in more than 30 years.
Energy supply shocks can take time to filter through the economy. Inflationary effects often lag for businesses by a few months, and once transportation and production costs rise, the U.S. inflation rate can jump further.
On Monday, May 11, the Federal Reserve Bank of Cleveland’s Inflation Nowcasting tool issued its newest inflation forecast for May.. The forecasting tool projects that TTM inflation will climb to 3.89% in May.. In February, U.S.. TTM inflation was 2.4%.. The effects of President Trump’s Iran war are expected to increase TTM inflation by almost 150 basis points over three months. a pace that could reverberate into Social Security payouts in 2027.
That forecast matters because Social Security’s cost-of-living adjustment is built to counter inflation for beneficiaries.. The COLA acts like a yearly “raise” that accounts for inflation pressures seniors face. aiming to offset the loss of purchasing power when the cost of goods and services rises while benefits remain static.
Since 1975, Social Security’s inflation-measuring yardstick has been the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W).. While the CPI-W is reported monthly by the BLS. Social Security uses only TTM readings ending in July. August. and September—the third quarter—to calculate the COLA.
If inflation tied to the Iran-related energy disruption persists into that third-quarter period, beneficiaries could face a larger raise in 2027.. After the release of the March inflation report. independent Social Security and Medicare policy analyst Mary Johnson nearly doubled her 2027 COLA forecast to 3.2% from 1.7%.. While the Consumer Price Index for All Urban Consumers (CPI-U) is the number typically used for inflation-reporting purposes. the CPI-W’s year-over-year increase in May is likely to be similar to the Cleveland Fed’s 3.89% inflation forecast.
There is a scenario where the COLA becomes unusually large. Hypothetically, if the inflation trajectory continues and Social Security’s 2027 COLA comes in at or around 3.9%, it would be the fifth-highest year-over-year percentage increase in 35 years.
The relationship between the forecasting numbers and Social Security’s formula is direct: the Cleveland Fed’s May TTM inflation projection moves from 2.4% in February to 3.89% in May. and the Iran war’s expected almost 150 basis points of added inflation over three months lines up with the period feeding the third-quarter CPI-W readings used for 2027’s COLA.
A higher COLA, though, would not automatically mean retirees are better off. Throughout much of the 21st century, retired-worker beneficiaries have received the short end of the stick, and that outcome is described as unlikely to change in 2027.
One reason is that long-term purchasing power has already been eroded.. A July 2024-published analysis by nonpartisan senior advocacy group The Senior Citizens League says the purchasing power of Social Security income has declined by 20% for retirees since 2010.. The decline is tied to what the reporting calls the inherent flaws of the CPI-W.
The CPI-W is tracked for “urban wage earners and clerical workers. ” but most Social Security recipients do not match that profile.. As of December 2024, 87% of Social Security beneficiaries were 62 or older, according to Social Security’s 2025 Fast Facts and Figures report.. Yet CPI-W pricing is following wage-earner and clerical-worker pricing. who are typically under age 62 and not receiving a Social Security retired-worker benefit.. In other words. the costs described as most important to seniors are not being reflected accurately in the inflation index determining the COLA.
There is also a second pressure on seniors’ income: Medicare’s monthly Part B premium has been consistently offsetting Social Security COLAs.. Part B covers outpatient services.. This year, the standard Part B premium jumped 9.7%, or $17.90 per month, to $202.90.. The reporting adds that annual increases ranging from 6% to 16% have been common for most of the century. and those increases can mostly or fully offset Social Security’s COLA for lifetime low-income beneficiaries.
So even with a potential history-maker COLA, the year’s broader spending realities remain tied to CPI-W’s structure and to the rising Part B premium.
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For now. the central question for retirees is whether the May inflation forecast—shaped by energy-market disruption connected to the Iran war—holds steady into the third quarter. when CPI-W readings are used to set Social Security’s 2027 COLA.. A larger adjustment may be possible. but the reporting’s warning is that a higher number alone may not restore purchasing power for seniors already grappling with CPI-W mismatches and Part B premium increases.
Federal Reserve inflation forecast Social Security COLA 2027 COLA CPI-W CPI-U Cleveland Fed Inflation Nowcasting Iran war inflation Social Security purchasing power Medicare Part B premium