The upcoming adjustment is being closely followed by retirees because it determines how monthly Social Security benefits will change in response to changes in consumer prices. Current estimates suggest an increase of about 3.5%, according to the Senior Citizens League, though the final number will only be confirmed after the remaining inflation data is released.
How the 2027 COLA Calculation Will Be Determined
The COLA is calculated using inflation data from July, August, and September. According to the Social Security Administration, the calculation relies on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), a measure used to track price changes affecting urban wage earners and clerical workers.
To determine the adjustment, the SSA will calculate the average CPI-W level for the third quarter of 2026 and compare it with the average CPI-W level from the same period in 2025. The percentage difference between these two figures will determine the 2027 increase.
The official announcement is scheduled after the Bureau of Labor Statistics (BLS) releases September inflation data on Oct. 14. This report provides the final piece of information required for the SSA to complete the calculation.
The current estimate from the Senior Citizens League is based on the available inflation data before the September figure is released. Since two of the three months used in the calculation are already available, the estimate is expected to provide an indication of where the final adjustment may fall, though it is not the official result. For comparison, beneficiaries received a 2.8% COLA increase for 2026. The estimated 2027 adjustment would represent a larger percentage increase if the 3.5% projection is confirmed.
What the Increase Could Mean for Retirees’ Monthly Payments
A 3.5% adjustment would affect the monthly benefit amount received by Social Security beneficiaries. Based on the average retired worker benefit of $2,083 per month as of July 2026, the increase would represent roughly $73 more per month.
The actual amount received by each beneficiary would depend on their individual Social Security benefit. The COLA percentage applies to existing payments, meaning people with different benefit amounts would see different dollar increases.
The final impact on retirees’ finances will also depend on other costs connected to Social Security payments. Many beneficiaries aged 65 and older have their Medicare Part B premiums deducted directly from their Social Security checks. According to the Motley Fool, the 2027 Medicare Part B premium amount has not yet been announced.
Medicare Part B premiums are typically released in mid-November. At that point, beneficiaries will know both the official Social Security increase and the amount that may remain after Medicare premium deductions. The Oct. 14 announcement will provide the official COLA figure for 2027, while later Medicare premium information will determine how the adjustment affects the net amount received by many retirees.
