The final adjustment will not be announced until October 14, after September inflation data becomes available. Still, the August report is expected to narrow the range of possible outcomes. According to reports, the Senior Citizens League currently projects a 3.6% COLA for 2027, compared with the 2.8% adjustment beneficiaries received for 2026.
August Inflation Will Bring the Calculation Closer to Completion
Social Security’s annual COLA is based on the Consumer Price Index for Urban Wage Earners and Clerical Workers, known as the CPI-W. The Social Security Administration compares average inflation during the third quarter of one year with the same period a year earlier.
That means inflation readings for July, August and September are required before the final figure can be calculated. July data is already available, and the September 11 release will leave only September’s inflation report outstanding.
According to reports, five of the six data points used in the year-to-year comparison will therefore be known once the August figures are published. The Senior Citizens League is expected to update its estimate after that release, although the final COLA will remain unsettled until October.
Kevin Thompson, chief executive of 9i Capital Group, told Newsweek that higher prices for oil and other inputs during August do not automatically mean inflation will exceed expectations. He also pointed to the transition toward cheaper winter-grade fuel, which could limit further price increases associated with refining costs.
August still matters because it forms part of the three-month period used in the COLA calculation. Thompson said an upside surprise in inflation could push the adjustment higher, while softer inflation could keep the increase more modest.
The Official 2027 Cola Will Arrive in October
The September inflation report is scheduled for October 14, providing the final information needed to complete the calculation. The Social Security Administration is expected to announce the 2027 COLA around the same time.
The annual adjustment applies to more than 70 million Americans receiving Social Security retirement, disability or Supplemental Security Income benefits. It is intended to help monthly payments keep pace with rising consumer prices.
A 3.6% adjustment, if the current projection holds, would raise an average monthly retirement benefit of about $2,086 to roughly $2,161, according to figures cited by The Motley Fool. That represents an increase of about $75 per month before Medicare premium deductions.
A larger COLA does not necessarily leave retirees with greater spending power. Alex Beene, a financial literacy instructor at the University of Tennessee at Martin, told Newsweek that the adjustment effectively compensates beneficiaries for inflation they have already experienced, while higher everyday expenses can absorb much of the increase.
After the official announcement, beneficiaries will be able to apply the COLA percentage to their existing payments to estimate their new benefit. The Social Security Administration later sends personalized notices, generally in December, showing exact monthly payment amounts for the coming year, including Medicare Part B withholding for beneficiaries enrolled in the program.
